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  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
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    <link:label id="lab_dec_BorrowingsNumberOfSustainabilityLinkedPerformanceTargets_label_en-US" xlink:label="lab_dec_BorrowingsNumberOfSustainabilityLinkedPerformanceTargets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Number Of Sustainability-Linked Performance Targets</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsNumberOfSustainabilityLinkedPerformanceTargets" xlink:href="dec-20250630.xsd#dec_BorrowingsNumberOfSustainabilityLinkedPerformanceTargets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsNumberOfSustainabilityLinkedPerformanceTargets" xlink:to="lab_dec_BorrowingsNumberOfSustainabilityLinkedPerformanceTargets" xlink:type="arc" order="1"/>
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    <link:label id="lab_ifrs-full_DerivativesMember_3d151584-3e9c-4255-b71c-0ffe5f5a6429_terseLabel_en-US" xlink:label="lab_ifrs-full_DerivativesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative financial instruments at fair value</link:label>
    <link:label id="lab_ifrs-full_DerivativesMember_label_en-US" xlink:label="lab_ifrs-full_DerivativesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivatives [member]</link:label>
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    <link:label id="lab_ifrs-full_CurrentRestrictedCashAndCashEquivalents_9e284550-c35b-4a0c-ab13-fff2284c6c4a_verboseLabel_en-US" xlink:label="lab_ifrs-full_CurrentRestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Restricted cash</link:label>
    <link:label id="lab_ifrs-full_CurrentRestrictedCashAndCashEquivalents_bfaa0f70-c226-4063-901b-765fd742ccdf_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentRestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current asset</link:label>
    <link:label id="lab_ifrs-full_CurrentRestrictedCashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_CurrentRestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current restricted cash and cash equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentRestrictedCashAndCashEquivalents" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentRestrictedCashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentRestrictedCashAndCashEquivalents" xlink:to="lab_ifrs-full_CurrentRestrictedCashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CovenantThreeMember_722cd53e-48fa-4a17-9637-eb96e16f98c6_terseLabel_en-US" xlink:label="lab_dec_CovenantThreeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Covenant Three</link:label>
    <link:label id="lab_dec_CovenantThreeMember_label_en-US" xlink:label="lab_dec_CovenantThreeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Covenant Three [Member]</link:label>
    <link:label id="lab_dec_CovenantThreeMember_documentation_en-US" xlink:label="lab_dec_CovenantThreeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Covenant Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CovenantThreeMember" xlink:href="dec-20250630.xsd#dec_CovenantThreeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CovenantThreeMember" xlink:to="lab_dec_CovenantThreeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_IncreaseInRestrictedCash_aa8bd3b0-9343-474a-912b-68ddd4e4be2a_negatedTerseLabel_en-US" xlink:label="lab_dec_IncreaseInRestrictedCash" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Increase in restricted cash</link:label>
    <link:label id="lab_dec_IncreaseInRestrictedCash_label_en-US" xlink:label="lab_dec_IncreaseInRestrictedCash" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase in restricted cash</link:label>
    <link:label id="lab_dec_IncreaseInRestrictedCash_documentation_en-US" xlink:label="lab_dec_IncreaseInRestrictedCash" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Increase in restricted cash</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_IncreaseInRestrictedCash" xlink:href="dec-20250630.xsd#dec_IncreaseInRestrictedCash"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_IncreaseInRestrictedCash" xlink:to="lab_dec_IncreaseInRestrictedCash" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_IncreaseThroughAccretionProvisionForDecommissioningRestorationAndRehabilitationCosts_a9232509-0637-41df-873f-e25210185139_terseLabel_en-US" xlink:label="lab_dec_IncreaseThroughAccretionProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accretion</link:label>
    <link:label id="lab_dec_IncreaseThroughAccretionProvisionForDecommissioningRestorationAndRehabilitationCosts_label_en-US" xlink:label="lab_dec_IncreaseThroughAccretionProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase Through Accretion, Provision For Decommissioning, Restoration And Rehabilitation Costs</link:label>
    <link:label id="lab_dec_IncreaseThroughAccretionProvisionForDecommissioningRestorationAndRehabilitationCosts_documentation_en-US" xlink:label="lab_dec_IncreaseThroughAccretionProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Increase Through Accretion, Provision For Decommissioning, Restoration And Rehabilitation Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_IncreaseThroughAccretionProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:href="dec-20250630.xsd#dec_IncreaseThroughAccretionProvisionForDecommissioningRestorationAndRehabilitationCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_IncreaseThroughAccretionProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:to="lab_dec_IncreaseThroughAccretionProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TaxExpenseOtherThanIncomeTaxExpense_46ff6c5e-c178-4233-baa9-2a3530e8f361_terseLabel_en-US" xlink:label="lab_ifrs-full_TaxExpenseOtherThanIncomeTaxExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payroll taxes</link:label>
    <link:label id="lab_ifrs-full_TaxExpenseOtherThanIncomeTaxExpense_label_en-US" xlink:label="lab_ifrs-full_TaxExpenseOtherThanIncomeTaxExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax expense other than income tax expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TaxExpenseOtherThanIncomeTaxExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TaxExpenseOtherThanIncomeTaxExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TaxExpenseOtherThanIncomeTaxExpense" xlink:to="lab_ifrs-full_TaxExpenseOtherThanIncomeTaxExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember_23f38503-1872-4045-98cf-ad7340acbe21_terseLabel_en-US" xlink:label="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision for decommissioning, restoration and rehabilitation costs</link:label>
    <link:label id="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember_label_en-US" xlink:label="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Provision for decommissioning, restoration and rehabilitation costs [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember" xlink:to="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WagesAndSalaries_a199373a-0f3f-40fd-b3cf-815789936139_terseLabel_en-US" xlink:label="lab_ifrs-full_WagesAndSalaries" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Wages and salaries</link:label>
    <link:label id="lab_ifrs-full_WagesAndSalaries_label_en-US" xlink:label="lab_ifrs-full_WagesAndSalaries" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Wages and salaries</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WagesAndSalaries" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WagesAndSalaries"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_WagesAndSalaries" xlink:to="lab_ifrs-full_WagesAndSalaries" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityFileNumber_ae4c91a5-2c1d-45c7-9d2b-c5e85181b51e_terseLabel_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity File Number</link:label>
    <link:label id="lab_dei_EntityFileNumber_label_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity File Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFileNumber" xlink:to="lab_dei_EntityFileNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSIINoteMember_0aec4ba5-d1dd-445e-8214-33251b168922_terseLabel_en-US" xlink:label="lab_dec_ABSIINoteMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS II Notes</link:label>
    <link:label id="lab_dec_ABSIINoteMember_label_en-US" xlink:label="lab_dec_ABSIINoteMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS II Note [Member]</link:label>
    <link:label id="lab_dec_ABSIINoteMember_documentation_en-US" xlink:label="lab_dec_ABSIINoteMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS II Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSIINoteMember" xlink:href="dec-20250630.xsd#dec_ABSIINoteMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSIINoteMember" xlink:to="lab_dec_ABSIINoteMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesLineItems_07c27df6-d6fc-4433-a0c6-d2713f94ce3e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesLineItems" xlink:to="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate_ce08e6e2-e596-440e-b09a-f89dcee71b39_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other non-current liabilities</link:label>
    <link:label id="lab_ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current liabilities recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:to="lab_ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantLoanToValueRatio_28f9ff21-c076-4c39-a2c0-55e3fe9a5a16_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantLoanToValueRatio" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan to value ratio</link:label>
    <link:label id="lab_dec_BorrowingsCovenantLoanToValueRatio_label_en-US" xlink:label="lab_dec_BorrowingsCovenantLoanToValueRatio" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Loan to Value Ratio</link:label>
    <link:label id="lab_dec_BorrowingsCovenantLoanToValueRatio_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantLoanToValueRatio" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Loan to Value Ratio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantLoanToValueRatio" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantLoanToValueRatio"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantLoanToValueRatio" xlink:to="lab_dec_BorrowingsCovenantLoanToValueRatio" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_AssetsAcquisitionCashConsideration_61aaaf21-0347-4492-a7d2-52010839739b_terseLabel_en-US" xlink:label="lab_dec_AssetsAcquisitionCashConsideration" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash consideration</link:label>
    <link:label id="lab_dec_AssetsAcquisitionCashConsideration_label_en-US" xlink:label="lab_dec_AssetsAcquisitionCashConsideration" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets Acquisition, Cash Consideration</link:label>
    <link:label id="lab_dec_AssetsAcquisitionCashConsideration_documentation_en-US" xlink:label="lab_dec_AssetsAcquisitionCashConsideration" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Assets Acquisition, Cash Consideration</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetsAcquisitionCashConsideration" xlink:href="dec-20250630.xsd#dec_AssetsAcquisitionCashConsideration"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AssetsAcquisitionCashConsideration" xlink:to="lab_dec_AssetsAcquisitionCashConsideration" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DividendsPaidOrdinaryShares_13eb12b5-3e37-483d-a265-3c5dd9025e75_terseLabel_en-US" xlink:label="lab_ifrs-full_DividendsPaidOrdinaryShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross Dividends Paid</link:label>
    <link:label id="lab_ifrs-full_DividendsPaidOrdinaryShares_label_en-US" xlink:label="lab_ifrs-full_DividendsPaidOrdinaryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends paid, ordinary shares</link:label>
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    <link:label id="lab_ifrs-full_DeferredTaxExpenseIncome_0f566526-32c4-4262-8d6d-c371dfe6ef5d_totalLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total deferred income tax (benefit) expense</link:label>
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    <link:label id="lab_dec_AssetAcquisitionNaturalGasAndOilProperties_8cbd62d2-e7bc-4800-9ac1-8ae102a54b41_terseLabel_en-US" xlink:label="lab_dec_AssetAcquisitionNaturalGasAndOilProperties" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Natural gas and oil properties</link:label>
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    <link:label id="lab_dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_ae2b6321-f35c-4661-8fa0-d02703acb84e_terseLabel_en-US" xlink:label="lab_dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]</link:label>
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    <link:label id="lab_dec_DescriptionOfAccountingPolicyForNewAccountingStandardsPolicyTextBlock_bfcace7b-d779-4877-92e5-133a79ed3c71_terseLabel_en-US" xlink:label="lab_dec_DescriptionOfAccountingPolicyForNewAccountingStandardsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">New or Amended Accounting Standards - Adopted</link:label>
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    <link:label id="lab_dec_SoldPutContractMember_c5cbd826-d14f-4e8a-b0c0-9bd7584b5b12_terseLabel_en-US" xlink:label="lab_dec_SoldPutContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sold puts</link:label>
    <link:label id="lab_dec_SoldPutContractMember_label_en-US" xlink:label="lab_dec_SoldPutContractMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sold Put Contract [Member]</link:label>
    <link:label id="lab_dec_SoldPutContractMember_documentation_en-US" xlink:label="lab_dec_SoldPutContractMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sold Put Contract</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_SoldPutContractMember" xlink:href="dec-20250630.xsd#dec_SoldPutContractMember"/>
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    <link:label id="lab_dec_OtherMiscellaneousBorrowingsMember_455c89f3-8586-465a-ac69-7834c9c4c364_terseLabel_en-US" xlink:label="lab_dec_OtherMiscellaneousBorrowingsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Miscellaneous Borrowings</link:label>
    <link:label id="lab_dec_OtherMiscellaneousBorrowingsMember_label_en-US" xlink:label="lab_dec_OtherMiscellaneousBorrowingsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Miscellaneous Borrowings [Member]</link:label>
    <link:label id="lab_dec_OtherMiscellaneousBorrowingsMember_documentation_en-US" xlink:label="lab_dec_OtherMiscellaneousBorrowingsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Miscellaneous Borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherMiscellaneousBorrowingsMember" xlink:href="dec-20250630.xsd#dec_OtherMiscellaneousBorrowingsMember"/>
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    <link:label id="lab_ifrs-full_DisclosureOfFinancialInstrumentsDesignatedAtFairValueThroughProfitOrLossExplanatory_d6ae7802-297b-4e36-916c-df1398ff7376_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsDesignatedAtFairValueThroughProfitOrLossExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of gain (loss) on derivative financial instruments</link:label>
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    <link:label id="lab_ifrs-full_InvestmentsInSubsidiaries_5c3840d5-5e40-4f2e-9fe9-efc60453b592_terseLabel_en-US" xlink:label="lab_ifrs-full_InvestmentsInSubsidiaries" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in subsidiary</link:label>
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    <link:label id="lab_ifrs-full_CurrentPortionOfLongtermBorrowings_6f95da78-4e35-4248-830a-693b1d834288_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentPortionOfLongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
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    <link:label id="lab_ifrs-full_Equity_59eb9a29-f691-44b7-848a-b01bf65cda60_totalLabel_en-US" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total equity</link:label>
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    <link:label id="lab_dec_MidstreamMember_47bb5566-33c3-4a32-aaa2-55e3ae224f15_terseLabel_en-US" xlink:label="lab_dec_MidstreamMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Midstream</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_MidstreamMember" xlink:href="dec-20250630.xsd#dec_MidstreamMember"/>
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    <link:label id="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesExplanatory_d1ce710b-670a-4df5-b56d-663de9da1a9e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Impact of Reasonably Possible 10% Change in Assumptions</link:label>
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    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperations_fd4e7592-3aa6-4b74-8f30-66d832dc8c11_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperations" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Cash generated from operations</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperations_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) operations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperations" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperations" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperations" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ThreeWayCollarContractPurchasedPutsMember_4220a74e-c997-47b1-98fa-9f93c308a59e_terseLabel_en-US" xlink:label="lab_dec_ThreeWayCollarContractPurchasedPutsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Three Way Collar Contract Purchased Puts</link:label>
    <link:label id="lab_dec_ThreeWayCollarContractPurchasedPutsMember_label_en-US" xlink:label="lab_dec_ThreeWayCollarContractPurchasedPutsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Way Collar Contract Purchased Puts [Member]</link:label>
    <link:label id="lab_dec_ThreeWayCollarContractPurchasedPutsMember_documentation_en-US" xlink:label="lab_dec_ThreeWayCollarContractPurchasedPutsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Way Collar Contract Purchased Puts</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ThreeWayCollarContractPurchasedPutsMember" xlink:href="dec-20250630.xsd#dec_ThreeWayCollarContractPurchasedPutsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ThreeWayCollarContractPurchasedPutsMember" xlink:to="lab_dec_ThreeWayCollarContractPurchasedPutsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_NoncurrentDerivativeAssetLiabilityOffset_218d0186-ff0f-4c89-9dcf-8ba27c5f943e_negatedTerseLabel_en-US" xlink:label="lab_dec_NoncurrentDerivativeAssetLiabilityOffset" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Non-current assets</link:label>
    <link:label id="lab_dec_NoncurrentDerivativeAssetLiabilityOffset_label_en-US" xlink:label="lab_dec_NoncurrentDerivativeAssetLiabilityOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncurrent Derivative Asset, Liability Offset</link:label>
    <link:label id="lab_dec_NoncurrentDerivativeAssetLiabilityOffset_documentation_en-US" xlink:label="lab_dec_NoncurrentDerivativeAssetLiabilityOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Noncurrent Derivative Asset, Liability Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NoncurrentDerivativeAssetLiabilityOffset" xlink:href="dec-20250630.xsd#dec_NoncurrentDerivativeAssetLiabilityOffset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_NoncurrentDerivativeAssetLiabilityOffset" xlink:to="lab_dec_NoncurrentDerivativeAssetLiabilityOffset" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GrossProfit_bf04fad8-21ce-4b61-8d1b-858db0ad5855_totalLabel_en-US" xlink:label="lab_ifrs-full_GrossProfit" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Gross profit</link:label>
    <link:label id="lab_ifrs-full_GrossProfit_label_en-US" xlink:label="lab_ifrs-full_GrossProfit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gross profit</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossProfit" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossProfit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GrossProfit" xlink:to="lab_ifrs-full_GrossProfit" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DividendsLineItems_138c8864-7f08-4f8d-b6f3-b681f1cdcfe3_terseLabel_en-US" xlink:label="lab_dec_DividendsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividends [Line Items]</link:label>
    <link:label id="lab_dec_DividendsLineItems_label_en-US" xlink:label="lab_dec_DividendsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends [Line Items]</link:label>
    <link:label id="lab_dec_DividendsLineItems_documentation_en-US" xlink:label="lab_dec_DividendsLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Dividends</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DividendsLineItems" xlink:href="dec-20250630.xsd#dec_DividendsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DividendsLineItems" xlink:to="lab_dec_DividendsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_7f72e6e2-63f7-45f3-a1c7-c969c28c285c_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about borrowings [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about borrowings [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsFairValue_4a52df64-2b51-4525-95a7-feef2925d74a_terseLabel_en-US" xlink:label="lab_dec_BorrowingsFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total fair value of outstanding debt</link:label>
    <link:label id="lab_dec_BorrowingsFairValue_label_en-US" xlink:label="lab_dec_BorrowingsFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Fair Value</link:label>
    <link:label id="lab_dec_BorrowingsFairValue_documentation_en-US" xlink:label="lab_dec_BorrowingsFairValue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Fair Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsFairValue" xlink:href="dec-20250630.xsd#dec_BorrowingsFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsFairValue" xlink:to="lab_dec_BorrowingsFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract_79f27575-2482-49b0-b2c7-d9c4dd8bc0dc_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about borrowings [abstract]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about borrowings [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:to="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantMinimumLiquidityRequirement_7c6324ee-3fcc-4582-ae45-b0ec04beebe9_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantMinimumLiquidityRequirement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum liquidity requirement</link:label>
    <link:label id="lab_dec_BorrowingsCovenantMinimumLiquidityRequirement_label_en-US" xlink:label="lab_dec_BorrowingsCovenantMinimumLiquidityRequirement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Minimum Liquidity Requirement</link:label>
    <link:label id="lab_dec_BorrowingsCovenantMinimumLiquidityRequirement_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantMinimumLiquidityRequirement" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Minimum Liquidity Requirement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantMinimumLiquidityRequirement" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantMinimumLiquidityRequirement"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantMinimumLiquidityRequirement" xlink:to="lab_dec_BorrowingsCovenantMinimumLiquidityRequirement" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantIfNoDiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal_3f0eb6ca-1f18-4d75-9630-84ef7ae796cb_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantIfNoDiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings, covenant, if no diversion or rapid amortization event is continuing, percentage of excess cash flows that must be paid towards additional principal</link:label>
    <link:label id="lab_dec_BorrowingsCovenantIfNoDiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal_label_en-US" xlink:label="lab_dec_BorrowingsCovenantIfNoDiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, If No Diversion Or Rapid Amortization Event Is Continuing, Percentage Of Excess Cash Flows That must Be Paid Towards Additional Principal</link:label>
    <link:label id="lab_dec_BorrowingsCovenantIfNoDiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantIfNoDiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, If No Diversion Or Rapid Amortization Event Is Continuing, Percentage Of Excess Cash Flows That must Be Paid Towards Additional Principal</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantIfNoDiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantIfNoDiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantIfNoDiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:to="lab_dec_BorrowingsCovenantIfNoDiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ProceedsFromDerivativeInstrumentsOperatingActivities_d292bd8a-ceca-42f7-bd5a-cae091261187_terseLabel_en-US" xlink:label="lab_dec_ProceedsFromDerivativeInstrumentsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from derivatives, operating activities</link:label>
    <link:label id="lab_dec_ProceedsFromDerivativeInstrumentsOperatingActivities_label_en-US" xlink:label="lab_dec_ProceedsFromDerivativeInstrumentsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds From Derivative Instruments, Operating Activities</link:label>
    <link:label id="lab_dec_ProceedsFromDerivativeInstrumentsOperatingActivities_documentation_en-US" xlink:label="lab_dec_ProceedsFromDerivativeInstrumentsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Proceeds From Derivative Instruments, Operating Activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ProceedsFromDerivativeInstrumentsOperatingActivities" xlink:href="dec-20250630.xsd#dec_ProceedsFromDerivativeInstrumentsOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ProceedsFromDerivativeInstrumentsOperatingActivities" xlink:to="lab_dec_ProceedsFromDerivativeInstrumentsOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_StatementOfChangesInEquityLineItems_d1e4a461-4e12-47ea-bc6a-fbfbfbed536f_terseLabel_en-US" xlink:label="lab_ifrs-full_StatementOfChangesInEquityLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement of changes in equity [line items]</link:label>
    <link:label id="lab_ifrs-full_StatementOfChangesInEquityLineItems_label_en-US" xlink:label="lab_ifrs-full_StatementOfChangesInEquityLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of changes in equity [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems" xlink:to="lab_ifrs-full_StatementOfChangesInEquityLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CovenantSevenMember_b70da806-c28d-4797-87e8-ee65cfc57ce3_terseLabel_en-US" xlink:label="lab_dec_CovenantSevenMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Covenant Seven</link:label>
    <link:label id="lab_dec_CovenantSevenMember_label_en-US" xlink:label="lab_dec_CovenantSevenMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Covenant Seven [Member]</link:label>
    <link:label id="lab_dec_CovenantSevenMember_documentation_en-US" xlink:label="lab_dec_CovenantSevenMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Covenant Seven</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CovenantSevenMember" xlink:href="dec-20250630.xsd#dec_CovenantSevenMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CovenantSevenMember" xlink:to="lab_dec_CovenantSevenMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherCurrentLiabilities_f5031e79-8e7e-45e1-8b54-09d126bc02a6_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherCurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current liabilities</link:label>
    <link:label id="lab_ifrs-full_OtherCurrentLiabilities_label_en-US" xlink:label="lab_ifrs-full_OtherCurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherCurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherCurrentLiabilities" xlink:to="lab_ifrs-full_OtherCurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DisclosureOfGeneralInformationAboutFinancialStatementsAbstract_label_en-US" xlink:label="lab_dec_DisclosureOfGeneralInformationAboutFinancialStatementsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of general information about financial statements [Abstract]</link:label>
    <link:label id="lab_dec_DisclosureOfGeneralInformationAboutFinancialStatementsAbstract_documentation_en-US" xlink:label="lab_dec_DisclosureOfGeneralInformationAboutFinancialStatementsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure of general information about financial statements</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DisclosureOfGeneralInformationAboutFinancialStatementsAbstract" xlink:href="dec-20250630.xsd#dec_DisclosureOfGeneralInformationAboutFinancialStatementsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DisclosureOfGeneralInformationAboutFinancialStatementsAbstract" xlink:to="lab_dec_DisclosureOfGeneralInformationAboutFinancialStatementsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract_70a4e048-4ab2-476b-beb3-94803859ab6a_terseLabel_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net income (loss) attributable to:</link:label>
    <link:label id="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract_label_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive income attributable to [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComprehensiveIncomeAttributableToAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:to="lab_ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ScheduleOfDerivativeInstrumentsTableTextBlock_61cabbfb-3126-4879-b5e1-34947a7dd8d6_terseLabel_en-US" xlink:label="lab_dec_ScheduleOfDerivativeInstrumentsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of net fair value of derivative financial instruments</link:label>
    <link:label id="lab_dec_ScheduleOfDerivativeInstrumentsTableTextBlock_label_en-US" xlink:label="lab_dec_ScheduleOfDerivativeInstrumentsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Derivative Instruments [Table Text Block]</link:label>
    <link:label id="lab_dec_ScheduleOfDerivativeInstrumentsTableTextBlock_documentation_en-US" xlink:label="lab_dec_ScheduleOfDerivativeInstrumentsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule Of Derivative Instruments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ScheduleOfDerivativeInstrumentsTableTextBlock" xlink:href="dec-20250630.xsd#dec_ScheduleOfDerivativeInstrumentsTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ScheduleOfDerivativeInstrumentsTableTextBlock" xlink:to="lab_dec_ScheduleOfDerivativeInstrumentsTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_SoonerStateJointABSHoldingsLLCMember_847661e3-5f6f-4945-bf5c-0fb1d7262ba8_terseLabel_en-US" xlink:label="lab_dec_SoonerStateJointABSHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sooner State Joint ABS Holdings LLC</link:label>
    <link:label id="lab_dec_SoonerStateJointABSHoldingsLLCMember_label_en-US" xlink:label="lab_dec_SoonerStateJointABSHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sooner State Joint ABS Holdings LLC [Member]</link:label>
    <link:label id="lab_dec_SoonerStateJointABSHoldingsLLCMember_documentation_en-US" xlink:label="lab_dec_SoonerStateJointABSHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sooner State Joint ABS Holdings LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_SoonerStateJointABSHoldingsLLCMember" xlink:href="dec-20250630.xsd#dec_SoonerStateJointABSHoldingsLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_SoonerStateJointABSHoldingsLLCMember" xlink:to="lab_dec_SoonerStateJointABSHoldingsLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearOneMember_54630aa0-fc9d-4a3b-ac2c-9e65b3f94094_terseLabel_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2026</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearOneMember_label_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year One [Member]</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearOneMember_documentation_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeInstrumentPeriodYearOneMember" xlink:href="dec-20250630.xsd#dec_DerivativeInstrumentPeriodYearOneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeInstrumentPeriodYearOneMember" xlink:to="lab_dec_DerivativeInstrumentPeriodYearOneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_TwoThousandTwentyFiveFebruaryMember_eafd3940-7c82-47bc-80d2-e752a677d1b5_terseLabel_en-US" xlink:label="lab_dec_TwoThousandTwentyFiveFebruaryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Five February</link:label>
    <link:label id="lab_dec_TwoThousandTwentyFiveFebruaryMember_label_en-US" xlink:label="lab_dec_TwoThousandTwentyFiveFebruaryMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Five February [Member]</link:label>
    <link:label id="lab_dec_TwoThousandTwentyFiveFebruaryMember_documentation_en-US" xlink:label="lab_dec_TwoThousandTwentyFiveFebruaryMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Five February</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_TwoThousandTwentyFiveFebruaryMember" xlink:href="dec-20250630.xsd#dec_TwoThousandTwentyFiveFebruaryMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_TwoThousandTwentyFiveFebruaryMember" xlink:to="lab_dec_TwoThousandTwentyFiveFebruaryMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_HedgeModificationsAssociatedWithABSNotes_1209b9ad-d369-4d3f-9290-bd15016dc8a0_negatedTerseLabel_en-US" xlink:label="lab_dec_HedgeModificationsAssociatedWithABSNotes" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Hedge modifications associated with ABS Notes</link:label>
    <link:label id="lab_dec_HedgeModificationsAssociatedWithABSNotes_label_en-US" xlink:label="lab_dec_HedgeModificationsAssociatedWithABSNotes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Hedge modifications associated with ABS Notes</link:label>
    <link:label id="lab_dec_HedgeModificationsAssociatedWithABSNotes_documentation_en-US" xlink:label="lab_dec_HedgeModificationsAssociatedWithABSNotes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Hedge modifications associated with ABS Notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_HedgeModificationsAssociatedWithABSNotes" xlink:href="dec-20250630.xsd#dec_HedgeModificationsAssociatedWithABSNotes"/>
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    <link:label id="lab_dec_FixedAmortizationOfMonthlyPrincipalLoanPayments_a1a3c7b0-5196-4816-b532-b7b1ca70a182_terseLabel_en-US" xlink:label="lab_dec_FixedAmortizationOfMonthlyPrincipalLoanPayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed amortization of monthly principal loan payments</link:label>
    <link:label id="lab_dec_FixedAmortizationOfMonthlyPrincipalLoanPayments_label_en-US" xlink:label="lab_dec_FixedAmortizationOfMonthlyPrincipalLoanPayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fixed Amortization Of Monthly Principal Loan Payments</link:label>
    <link:label id="lab_dec_FixedAmortizationOfMonthlyPrincipalLoanPayments_documentation_en-US" xlink:label="lab_dec_FixedAmortizationOfMonthlyPrincipalLoanPayments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fixed Amortization Of Monthly Principal Loan Payments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_FixedAmortizationOfMonthlyPrincipalLoanPayments" xlink:href="dec-20250630.xsd#dec_FixedAmortizationOfMonthlyPrincipalLoanPayments"/>
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    <link:label id="lab_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsExplanatory_2991f15e-7c8a-4515-8e48-1f7e2e500833_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of effect of netting, assets</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of offsetting of financial assets [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOffsettingOfFinancialAssetsExplanatory"/>
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    <link:label id="lab_ifrs-full_UndrawnBorrowingFacilities_97a7b868-0a4f-4948-9e93-6d0349ee0524_terseLabel_en-US" xlink:label="lab_ifrs-full_UndrawnBorrowingFacilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available borrowing</link:label>
    <link:label id="lab_ifrs-full_UndrawnBorrowingFacilities_label_en-US" xlink:label="lab_ifrs-full_UndrawnBorrowingFacilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Undrawn borrowing facilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UndrawnBorrowingFacilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UndrawnBorrowingFacilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_UndrawnBorrowingFacilities" xlink:to="lab_ifrs-full_UndrawnBorrowingFacilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputAssets_3c2864b8-505b-4d47-94a5-7a3fede4a51a_terseLabel_en-US" xlink:label="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of reasonably possible decrease in unobservable input, assets</link:label>
    <link:label id="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputAssets_label_en-US" xlink:label="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of reasonably possible decrease in unobservable input, assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputAssets" xlink:to="lab_ifrs-full_PercentageOfReasonablyPossibleDecreaseInUnobservableInputAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DiscountRateMeasurementInputMember_1803a523-f0ad-4c76-8611-f5e929dec1b7_terseLabel_en-US" xlink:label="lab_ifrs-full_DiscountRateMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Discount rate</link:label>
    <link:label id="lab_ifrs-full_DiscountRateMeasurementInputMember_label_en-US" xlink:label="lab_ifrs-full_DiscountRateMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Discount rate, measurement input [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DiscountRateMeasurementInputMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DiscountRateMeasurementInputMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DiscountRateMeasurementInputMember" xlink:to="lab_ifrs-full_DiscountRateMeasurementInputMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable_b46dc2e3-7c18-48de-9438-801d3a6634f2_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in trade receivables and other current assets</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for decrease (increase) in trade accounts receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xlink:to="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DividendsPaidClassifiedAsFinancingActivities_715494bc-21f5-4c34-9cd8-2a185f0d354b_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Dividends to shareholders</link:label>
    <link:label id="lab_ifrs-full_DividendsPaidClassifiedAsFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends paid, classified as financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsPaidClassifiedAsFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:to="lab_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DivestituresNameAxis_76c879c1-120f-401c-ada5-f37bf7009d84_terseLabel_en-US" xlink:label="lab_dec_DivestituresNameAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Divestitures, Name [Axis]</link:label>
    <link:label id="lab_dec_DivestituresNameAxis_label_en-US" xlink:label="lab_dec_DivestituresNameAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Divestitures, Name [Axis]</link:label>
    <link:label id="lab_dec_DivestituresNameAxis_documentation_en-US" xlink:label="lab_dec_DivestituresNameAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Divestitures, Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DivestituresNameAxis" xlink:href="dec-20250630.xsd#dec_DivestituresNameAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DivestituresNameAxis" xlink:to="lab_dec_DivestituresNameAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialLiabilities_ebed9215-b135-46f0-b957-718c885d4b0b_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative financial instruments</link:label>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialLiabilities_34198ae6-0829-45b2-a1a9-7347968e9de6_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Current liabilities</link:label>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialLiabilities_4881f0bd-80a9-46e0-8ba9-ada935eb421d_negatedTotalLabel_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Current liabilities</link:label>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current derivative financial liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentDerivativeFinancialLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:to="lab_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OtherAcquisitionsMember_103980f8-7414-4d51-890d-652397aa3d08_terseLabel_en-US" xlink:label="lab_dec_OtherAcquisitionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Acquisitions</link:label>
    <link:label id="lab_dec_OtherAcquisitionsMember_label_en-US" xlink:label="lab_dec_OtherAcquisitionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Acquisitions [Member]</link:label>
    <link:label id="lab_dec_OtherAcquisitionsMember_documentation_en-US" xlink:label="lab_dec_OtherAcquisitionsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Acquisitions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherAcquisitionsMember" xlink:href="dec-20250630.xsd#dec_OtherAcquisitionsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OtherAcquisitionsMember" xlink:to="lab_dec_OtherAcquisitionsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsAbstract_label_en-US" xlink:label="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Provision for decommissioning, restoration and rehabilitation costs [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsAbstract" xlink:to="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossAttributableToOwnersOfParent_f456b29e-77fe-48eb-905c-3491f432b061_verboseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Owners of Diversified Energy Company PLC</link:label>
    <link:label id="lab_ifrs-full_ProfitLossAttributableToOwnersOfParent_label_en-US" xlink:label="lab_ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit (loss), attributable to owners of parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent"/>
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    <link:label id="lab_dec_AssetsAcquisitionValueOfIssuedSharesConsideration_67f6807c-1c16-4f6f-ac57-19361fddfdce_terseLabel_en-US" xlink:label="lab_dec_AssetsAcquisitionValueOfIssuedSharesConsideration" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Value of shares issued in an asset acquisition</link:label>
    <link:label id="lab_dec_AssetsAcquisitionValueOfIssuedSharesConsideration_label_en-US" xlink:label="lab_dec_AssetsAcquisitionValueOfIssuedSharesConsideration" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets Acquisition Value Of Issued Shares Consideration</link:label>
    <link:label id="lab_dec_AssetsAcquisitionValueOfIssuedSharesConsideration_documentation_en-US" xlink:label="lab_dec_AssetsAcquisitionValueOfIssuedSharesConsideration" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Assets Acquisition Value Of Issued Shares Consideration</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetsAcquisitionValueOfIssuedSharesConsideration" xlink:href="dec-20250630.xsd#dec_AssetsAcquisitionValueOfIssuedSharesConsideration"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AssetsAcquisitionValueOfIssuedSharesConsideration" xlink:to="lab_dec_AssetsAcquisitionValueOfIssuedSharesConsideration" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_TwoThousandTwentyFiveJulyMember_7783ec6e-7c94-4793-a6f7-fa004fb5327e_terseLabel_en-US" xlink:label="lab_dec_TwoThousandTwentyFiveJulyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Five July</link:label>
    <link:label id="lab_dec_TwoThousandTwentyFiveJulyMember_label_en-US" xlink:label="lab_dec_TwoThousandTwentyFiveJulyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Five July [Member]</link:label>
    <link:label id="lab_dec_TwoThousandTwentyFiveJulyMember_documentation_en-US" xlink:label="lab_dec_TwoThousandTwentyFiveJulyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Thousand Twenty Five July</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_TwoThousandTwentyFiveJulyMember" xlink:href="dec-20250630.xsd#dec_TwoThousandTwentyFiveJulyMember"/>
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    <link:label id="lab_ifrs-full_StatementOfFinancialPositionAbstract_label_en-US" xlink:label="lab_ifrs-full_StatementOfFinancialPositionAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of financial position [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfFinancialPositionAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfFinancialPositionAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract" xlink:to="lab_ifrs-full_StatementOfFinancialPositionAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSIVNoteMember_dfde17ac-6b18-48e5-b97f-502dfec3b657_terseLabel_en-US" xlink:label="lab_dec_ABSIVNoteMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS IV Notes</link:label>
    <link:label id="lab_dec_ABSIVNoteMember_label_en-US" xlink:label="lab_dec_ABSIVNoteMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS IV Note [Member]</link:label>
    <link:label id="lab_dec_ABSIVNoteMember_documentation_en-US" xlink:label="lab_dec_ABSIVNoteMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS IV Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSIVNoteMember" xlink:href="dec-20250630.xsd#dec_ABSIVNoteMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSIVNoteMember" xlink:to="lab_dec_ABSIVNoteMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherOperatingIncomeExpense_f1df09c7-de5b-4575-9814-1d2ff6740a8c_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherOperatingIncomeExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other income (expense)</link:label>
    <link:label id="lab_ifrs-full_OtherOperatingIncomeExpense_label_en-US" xlink:label="lab_ifrs-full_OtherOperatingIncomeExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other operating income (expense)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherOperatingIncomeExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherOperatingIncomeExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherOperatingIncomeExpense" xlink:to="lab_ifrs-full_OtherOperatingIncomeExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsIncreaseDueToAcquisition_1fbd5da2-9dbe-49c8-87ca-247fc6a6d526_terseLabel_en-US" xlink:label="lab_dec_BorrowingsIncreaseDueToAcquisition" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquired as part of an acquisition</link:label>
    <link:label id="lab_dec_BorrowingsIncreaseDueToAcquisition_label_en-US" xlink:label="lab_dec_BorrowingsIncreaseDueToAcquisition" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Increase Due to Acquisition</link:label>
    <link:label id="lab_dec_BorrowingsIncreaseDueToAcquisition_documentation_en-US" xlink:label="lab_dec_BorrowingsIncreaseDueToAcquisition" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Increase Due to Acquisition</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsIncreaseDueToAcquisition" xlink:href="dec-20250630.xsd#dec_BorrowingsIncreaseDueToAcquisition"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsIncreaseDueToAcquisition" xlink:to="lab_dec_BorrowingsIncreaseDueToAcquisition" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CoverAbstract_label_en-US" xlink:label="lab_dei_CoverAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cover [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CoverAbstract" xlink:to="lab_dei_CoverAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_0c8430cf-b928-4172-ab28-44b3ce3ac28e_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Repurchase of shares by the EBT</link:label>
    <link:label id="lab_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_label_en-US" xlink:label="lab_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to acquire or redeem entity's shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PaymentsToAcquireOrRedeemEntitysShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" xlink:to="lab_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsDiscountPercentage_a1015441-b096-4831-9fdf-b9de3e3564e0_terseLabel_en-US" xlink:label="lab_dec_BorrowingsDiscountPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Discount percentage</link:label>
    <link:label id="lab_dec_BorrowingsDiscountPercentage_label_en-US" xlink:label="lab_dec_BorrowingsDiscountPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Discount Percentage</link:label>
    <link:label id="lab_dec_BorrowingsDiscountPercentage_documentation_en-US" xlink:label="lab_dec_BorrowingsDiscountPercentage" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Discount Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsDiscountPercentage" xlink:href="dec-20250630.xsd#dec_BorrowingsDiscountPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsDiscountPercentage" xlink:to="lab_dec_BorrowingsDiscountPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_PaymentsForSecureFinancingCosts_de8e289c-f476-46d1-9a60-876fc309d171_negatedTerseLabel_en-US" xlink:label="lab_dec_PaymentsForSecureFinancingCosts" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Costs incurred to secure financing</link:label>
    <link:label id="lab_dec_PaymentsForSecureFinancingCosts_label_en-US" xlink:label="lab_dec_PaymentsForSecureFinancingCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for Secure Financing Costs</link:label>
    <link:label id="lab_dec_PaymentsForSecureFinancingCosts_documentation_en-US" xlink:label="lab_dec_PaymentsForSecureFinancingCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payments for Secure Financing Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_PaymentsForSecureFinancingCosts" xlink:href="dec-20250630.xsd#dec_PaymentsForSecureFinancingCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_PaymentsForSecureFinancingCosts" xlink:to="lab_dec_PaymentsForSecureFinancingCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_EastTexasIIMember_977a5f84-cad4-4e7e-b104-598fedea9bba_terseLabel_en-US" xlink:label="lab_dec_EastTexasIIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">East Texas II</link:label>
    <link:label id="lab_dec_EastTexasIIMember_label_en-US" xlink:label="lab_dec_EastTexasIIMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EastTexasII [Member]</link:label>
    <link:label id="lab_dec_EastTexasIIMember_documentation_en-US" xlink:label="lab_dec_EastTexasIIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">EastTexasII</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_EastTexasIIMember" xlink:href="dec-20250630.xsd#dec_EastTexasIIMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_EastTexasIIMember" xlink:to="lab_dec_EastTexasIIMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory_8eba9dc9-144d-407e-9966-c8ec5fc9e695_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prior Period Reclassifications</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of reclassifications or changes in presentation [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory" xlink:to="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantCurrentAssetsToCurrentLiabilitiesRatioMinimum_f9b61d20-4821-41c6-9e7e-7f276f6b0322_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantCurrentAssetsToCurrentLiabilitiesRatioMinimum" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings covenant, minimum current assets to current liabilities ratio</link:label>
    <link:label id="lab_dec_BorrowingsCovenantCurrentAssetsToCurrentLiabilitiesRatioMinimum_label_en-US" xlink:label="lab_dec_BorrowingsCovenantCurrentAssetsToCurrentLiabilitiesRatioMinimum" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Current Assets to Current Liabilities Ratio, Minimum</link:label>
    <link:label id="lab_dec_BorrowingsCovenantCurrentAssetsToCurrentLiabilitiesRatioMinimum_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantCurrentAssetsToCurrentLiabilitiesRatioMinimum" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Current Assets to Current Liabilities Ratio, Minimum</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantCurrentAssetsToCurrentLiabilitiesRatioMinimum" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantCurrentAssetsToCurrentLiabilitiesRatioMinimum"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantCurrentAssetsToCurrentLiabilitiesRatioMinimum" xlink:to="lab_dec_BorrowingsCovenantCurrentAssetsToCurrentLiabilitiesRatioMinimum" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeAssetLiabilityNetOffset_8e2e6961-d0b9-4573-8207-227e097d66cb_negatedTotalLabel_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityNetOffset" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Total net assets (liabilities)</link:label>
    <link:label id="lab_dec_DerivativeAssetLiabilityNetOffset_label_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityNetOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset (Liability), Net, Offset</link:label>
    <link:label id="lab_dec_DerivativeAssetLiabilityNetOffset_documentation_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityNetOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Asset (Liability), Net, Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeAssetLiabilityNetOffset" xlink:href="dec-20250630.xsd#dec_DerivativeAssetLiabilityNetOffset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeAssetLiabilityNetOffset" xlink:to="lab_dec_DerivativeAssetLiabilityNetOffset" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsIssuancePremiumPercentage_7811628b-5037-4c5e-8193-31bda49da494_terseLabel_en-US" xlink:label="lab_dec_BorrowingsIssuancePremiumPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Premium percentage</link:label>
    <link:label id="lab_dec_BorrowingsIssuancePremiumPercentage_label_en-US" xlink:label="lab_dec_BorrowingsIssuancePremiumPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings Issuance Premium, Percentage</link:label>
    <link:label id="lab_dec_BorrowingsIssuancePremiumPercentage_documentation_en-US" xlink:label="lab_dec_BorrowingsIssuancePremiumPercentage" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings Issuance Premium, Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsIssuancePremiumPercentage" xlink:href="dec-20250630.xsd#dec_BorrowingsIssuancePremiumPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsIssuancePremiumPercentage" xlink:to="lab_dec_BorrowingsIssuancePremiumPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CrescentPassEnergyMember_c2a02548-ccf4-4ab4-8861-10138b1107af_terseLabel_en-US" xlink:label="lab_dec_CrescentPassEnergyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Crescent Pass Energy</link:label>
    <link:label id="lab_dec_CrescentPassEnergyMember_label_en-US" xlink:label="lab_dec_CrescentPassEnergyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Crescent Pass Energy [Member]</link:label>
    <link:label id="lab_dec_CrescentPassEnergyMember_documentation_en-US" xlink:label="lab_dec_CrescentPassEnergyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Crescent Pass Energy</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CrescentPassEnergyMember" xlink:href="dec-20250630.xsd#dec_CrescentPassEnergyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CrescentPassEnergyMember" xlink:to="lab_dec_CrescentPassEnergyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSIAndTermLoanIMember_b7f52b87-f5f5-454b-891f-0e289ef12c7b_terseLabel_en-US" xlink:label="lab_dec_ABSIAndTermLoanIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS I And Term Loan I</link:label>
    <link:label id="lab_dec_ABSIAndTermLoanIMember_label_en-US" xlink:label="lab_dec_ABSIAndTermLoanIMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS I And Term Loan I [Member]</link:label>
    <link:label id="lab_dec_ABSIAndTermLoanIMember_documentation_en-US" xlink:label="lab_dec_ABSIAndTermLoanIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS I And Term Loan I</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSIAndTermLoanIMember" xlink:href="dec-20250630.xsd#dec_ABSIAndTermLoanIMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSIAndTermLoanIMember" xlink:to="lab_dec_ABSIAndTermLoanIMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_TwoWayCollarContractSoldCallsMember_e63f975d-e1d8-4795-8b1e-d1294fb37daa_terseLabel_en-US" xlink:label="lab_dec_TwoWayCollarContractSoldCallsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Two Way Collar Contract Sold Calls</link:label>
    <link:label id="lab_dec_TwoWayCollarContractSoldCallsMember_label_en-US" xlink:label="lab_dec_TwoWayCollarContractSoldCallsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Way Collar Contract Sold Calls [Member]</link:label>
    <link:label id="lab_dec_TwoWayCollarContractSoldCallsMember_documentation_en-US" xlink:label="lab_dec_TwoWayCollarContractSoldCallsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Way Collar Contract Sold Calls</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_TwoWayCollarContractSoldCallsMember" xlink:href="dec-20250630.xsd#dec_TwoWayCollarContractSoldCallsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_TwoWayCollarContractSoldCallsMember" xlink:to="lab_dec_TwoWayCollarContractSoldCallsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory_8d7f2f49-a2d5-49e1-bc1d-689b8588573b_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of Consolidation</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for subsidiaries [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentLiabilities_04467172-0857-4cb8-939a-e9ba4e82f053_totalLabel_en-US" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current liabilities</link:label>
    <link:label id="lab_ifrs-full_CurrentLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLiabilities" xlink:to="lab_ifrs-full_CurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_AssetAcquisitionOtherLiabilitiesCurrent_24f285d9-e6ea-49e1-9509-310fde6f94e8_negatedTerseLabel_en-US" xlink:label="lab_dec_AssetAcquisitionOtherLiabilitiesCurrent" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other current liabilities</link:label>
    <link:label id="lab_dec_AssetAcquisitionOtherLiabilitiesCurrent_label_en-US" xlink:label="lab_dec_AssetAcquisitionOtherLiabilitiesCurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Other Liabilities, Current</link:label>
    <link:label id="lab_dec_AssetAcquisitionOtherLiabilitiesCurrent_documentation_en-US" xlink:label="lab_dec_AssetAcquisitionOtherLiabilitiesCurrent" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Other Liabilities, Current</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetAcquisitionOtherLiabilitiesCurrent" xlink:href="dec-20250630.xsd#dec_AssetAcquisitionOtherLiabilitiesCurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AssetAcquisitionOtherLiabilitiesCurrent" xlink:to="lab_dec_AssetAcquisitionOtherLiabilitiesCurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DepletionExpenseMember_0c6c6e7f-702e-49cd-9579-75f79ae83a2f_terseLabel_en-US" xlink:label="lab_dec_DepletionExpenseMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depletion</link:label>
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    <link:label id="lab_dec_DepletionExpenseMember_documentation_en-US" xlink:label="lab_dec_DepletionExpenseMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Depletion Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DepletionExpenseMember" xlink:href="dec-20250630.xsd#dec_DepletionExpenseMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DepletionExpenseMember" xlink:to="lab_dec_DepletionExpenseMember" xlink:type="arc" order="1"/>
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    <link:label id="lab_dec_ABSNotesAndTermLoanIMember_ab2c71d5-0d47-4299-b8a5-ae2f9580b638_terseLabel_en-US" xlink:label="lab_dec_ABSNotesAndTermLoanIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS Notes and Term Loan I</link:label>
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    <link:label id="lab_dec_ABSNotesAndTermLoanIMember_documentation_en-US" xlink:label="lab_dec_ABSNotesAndTermLoanIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS Notes and Term Loan I</link:label>
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    <link:label id="lab_dec_IncreaseDecreaseThroughRevisionToEstimateProvisionForDecommissioningRestorationAndRehabilitationCosts_documentation_en-US" xlink:label="lab_dec_IncreaseDecreaseThroughRevisionToEstimateProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Increase (Decrease) Through Revision To Estimate, Provision For Decommissioning, Restoration And Rehabilitation Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_IncreaseDecreaseThroughRevisionToEstimateProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:href="dec-20250630.xsd#dec_IncreaseDecreaseThroughRevisionToEstimateProvisionForDecommissioningRestorationAndRehabilitationCosts"/>
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    <link:label id="lab_dec_PutContractMember_5acc8d23-43ad-47e3-9ffc-f6549e079c97_terseLabel_en-US" xlink:label="lab_dec_PutContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Puts</link:label>
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    <link:label id="lab_dec_DeferredStateAndLocalIncomeTaxExpenseIncome_71e49a45-adc2-48a3-8069-dae81ead0def_terseLabel_en-US" xlink:label="lab_dec_DeferredStateAndLocalIncomeTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">State (benefit) expense</link:label>
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    <link:label id="lab_ifrs-full_NoncontrollingInterestsMember_771cee42-197d-4652-8c70-bbb8fc4025f0_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncontrollingInterestsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-Controlling Interest</link:label>
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    <link:label id="lab_dec_AdditionsProvisionForDecommissioningRestorationAndRehabilitationCosts_3b98d1d8-24a8-43b3-a37f-bd8030544e1a_terseLabel_en-US" xlink:label="lab_dec_AdditionsProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additions</link:label>
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    <link:label id="lab_ifrs-full_SharePremium_9f7a9054-0ae7-4054-ab21-02d8d54c128d_terseLabel_en-US" xlink:label="lab_ifrs-full_SharePremium" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share premium</link:label>
    <link:label id="lab_ifrs-full_SharePremium_label_en-US" xlink:label="lab_ifrs-full_SharePremium" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share premium</link:label>
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    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract_058ec5cc-9b85-4fd9-8694-7500afa89e19_terseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities:</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfLiabilitiesDomain_974fc4da-ad02-461b-9fd6-daa2f553d59c_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfLiabilitiesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of liabilities [domain]</link:label>
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    <link:label id="lab_ifrs-full_GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid_0fcb9e76-d4ff-4dc7-999d-f8b22cb8ed2d_terseLabel_en-US" xlink:label="lab_ifrs-full_GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loss on early retirement of debt</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory_099143dd-5b36-42e0-8af1-65923fff9030_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-Based Payments</link:label>
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    <link:label id="lab_ifrs-full_LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts_524ff396-2fb0-4bd2-bac9-11effd0e937b_terseLabel_en-US" xlink:label="lab_ifrs-full_LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset retirement obligations</link:label>
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    <link:label id="lab_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_9d09adbb-f8bf-47fa-8b0c-3d982c6c2332_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares outstanding (in shares)</link:label>
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    <link:label id="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_8689c96d-2c4f-48a5-9446-48933c01f2f9_terseLabel_en-US" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsidiaries [axis]</link:label>
    <link:label id="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_label_en-US" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsidiaries [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:to="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_NotesTermLoanAndOtherNotesPayableMember_e0c3a191-619c-4f77-92f1-5499f5bd1b75_terseLabel_en-US" xlink:label="lab_dec_NotesTermLoanAndOtherNotesPayableMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notes Term Loan And Other Notes Payable</link:label>
    <link:label id="lab_dec_NotesTermLoanAndOtherNotesPayableMember_label_en-US" xlink:label="lab_dec_NotesTermLoanAndOtherNotesPayableMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Notes Term Loan And Other Notes Payable [Member]</link:label>
    <link:label id="lab_dec_NotesTermLoanAndOtherNotesPayableMember_documentation_en-US" xlink:label="lab_dec_NotesTermLoanAndOtherNotesPayableMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Notes Term Loan And Other Notes Payable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NotesTermLoanAndOtherNotesPayableMember" xlink:href="dec-20250630.xsd#dec_NotesTermLoanAndOtherNotesPayableMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_NotesTermLoanAndOtherNotesPayableMember" xlink:to="lab_dec_NotesTermLoanAndOtherNotesPayableMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TypesOfInterestRatesAxis_81dfc059-f187-4dd9-9dfa-82ce92b81d9e_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfInterestRatesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Types of interest rates [axis]</link:label>
    <link:label id="lab_ifrs-full_TypesOfInterestRatesAxis_label_en-US" xlink:label="lab_ifrs-full_TypesOfInterestRatesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Types of interest rates [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis" xlink:to="lab_ifrs-full_TypesOfInterestRatesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Revenue_0a159e6f-d7f8-449a-84ec-7dc2a23cbfe9_netLabel_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US">Revenue</link:label>
    <link:label id="lab_ifrs-full_Revenue_f9f630b6-2665-4026-b4f3-bcb2eebc9444_terseLabel_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total revenue</link:label>
    <link:label id="lab_ifrs-full_Revenue_label_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Revenue" xlink:to="lab_ifrs-full_Revenue" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressCityOrTown_3b5fae66-ade5-4f15-ae27-a80b52372714_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:label id="lab_dei_EntityAddressCityOrTown_label_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCityOrTown" xlink:to="lab_dei_EntityAddressCityOrTown" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_7c191410-6378-4969-a9b4-1a78aba21884_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segment Reporting</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for segment reporting [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForTimingRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts_795511b4-d325-4600-b6ae-899c88401b51_terseLabel_en-US" xlink:label="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForTimingRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase attributable to change in timing</link:label>
    <link:label id="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForTimingRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts_label_en-US" xlink:label="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForTimingRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) Through Revision To Estimate For Timing Revisions, Provision For Decommissioning, Restoration And Rehabilitation Costs</link:label>
    <link:label id="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForTimingRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts_documentation_en-US" xlink:label="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForTimingRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Increase (Decrease) Through Revision To Estimate For Timing Revisions, Provision For Decommissioning, Restoration And Rehabilitation Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_IncreaseDecreaseThroughRevisionToEstimateForTimingRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:href="dec-20250630.xsd#dec_IncreaseDecreaseThroughRevisionToEstimateForTimingRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_IncreaseDecreaseThroughRevisionToEstimateForTimingRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:to="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForTimingRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfBorrowingsExplanatory_3be680af-991e-4f00-a191-e90f0a068e03_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfBorrowingsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of borrowings [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfBorrowingsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsOnTermLoan_47e3e522-2929-4298-bab0-8293d980f69a_terseLabel_en-US" xlink:label="lab_dec_BorrowingsOnTermLoan" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings on term loan</link:label>
    <link:label id="lab_dec_BorrowingsOnTermLoan_label_en-US" xlink:label="lab_dec_BorrowingsOnTermLoan" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings On Term Loan</link:label>
    <link:label id="lab_dec_BorrowingsOnTermLoan_documentation_en-US" xlink:label="lab_dec_BorrowingsOnTermLoan" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings On Term Loan</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsOnTermLoan" xlink:href="dec-20250630.xsd#dec_BorrowingsOnTermLoan"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsOnTermLoan" xlink:to="lab_dec_BorrowingsOnTermLoan" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IssuedCapitalMember_9196eac6-8c92-40a6-9800-bb50553b22c2_terseLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapitalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share Capital</link:label>
    <link:label id="lab_ifrs-full_IssuedCapitalMember_7a1a51fd-503f-4074-a59e-126432214979_verboseLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapitalMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total Share Capital</link:label>
    <link:label id="lab_ifrs-full_IssuedCapitalMember_label_en-US" xlink:label="lab_ifrs-full_IssuedCapitalMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Issued capital [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IssuedCapitalMember" xlink:to="lab_ifrs-full_IssuedCapitalMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_SignificantAccountingPoliciesAbstract_label_en-US" xlink:label="lab_dec_SignificantAccountingPoliciesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Significant Accounting Policies [Abstract]</link:label>
    <link:label id="lab_dec_SignificantAccountingPoliciesAbstract_documentation_en-US" xlink:label="lab_dec_SignificantAccountingPoliciesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure of summary of significant accounting policies explanatory [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_SignificantAccountingPoliciesAbstract" xlink:href="dec-20250630.xsd#dec_SignificantAccountingPoliciesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_SignificantAccountingPoliciesAbstract" xlink:to="lab_dec_SignificantAccountingPoliciesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_AssetAcquisitionBorrowingsRecognisedAsOfAcquisitionDate_984a0204-b14f-4b24-bbe0-a3117dfc2cb9_terseLabel_en-US" xlink:label="lab_dec_AssetAcquisitionBorrowingsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset acquisition, borrowings recognised as of acquisition date</link:label>
    <link:label id="lab_dec_AssetAcquisitionBorrowingsRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_dec_AssetAcquisitionBorrowingsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Borrowings Recognised As Of Acquisition Date</link:label>
    <link:label id="lab_dec_AssetAcquisitionBorrowingsRecognisedAsOfAcquisitionDate_documentation_en-US" xlink:label="lab_dec_AssetAcquisitionBorrowingsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Borrowings Recognised As Of Acquisition Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetAcquisitionBorrowingsRecognisedAsOfAcquisitionDate" xlink:href="dec-20250630.xsd#dec_AssetAcquisitionBorrowingsRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AssetAcquisitionBorrowingsRecognisedAsOfAcquisitionDate" xlink:to="lab_dec_AssetAcquisitionBorrowingsRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RestrictedCashAndCashEquivalents_8ce531f1-811e-4ace-b5a5-fd969fad4332_totalLabel_en-US" xlink:label="lab_ifrs-full_RestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total restricted cash</link:label>
    <link:label id="lab_ifrs-full_RestrictedCashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_RestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted cash and cash equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RestrictedCashAndCashEquivalents" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedCashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RestrictedCashAndCashEquivalents" xlink:to="lab_ifrs-full_RestrictedCashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherNoncurrentLiabilities_70462d5e-21cf-43ee-8fc9-23a56d34e87a_netLabel_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentLiabilities" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US">Other non-current liabilities</link:label>
    <link:label id="lab_ifrs-full_OtherNoncurrentLiabilities_label_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other non-current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherNoncurrentLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherNoncurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherNoncurrentLiabilities" xlink:to="lab_ifrs-full_OtherNoncurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_TwoWayCollarContractPurchasedPutsMember_96e3acd7-8510-4993-884a-7633de45ae50_terseLabel_en-US" xlink:label="lab_dec_TwoWayCollarContractPurchasedPutsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Two Way Collar Contract Purchased Puts</link:label>
    <link:label id="lab_dec_TwoWayCollarContractPurchasedPutsMember_label_en-US" xlink:label="lab_dec_TwoWayCollarContractPurchasedPutsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Way Collar Contract Purchased Puts [Member]</link:label>
    <link:label id="lab_dec_TwoWayCollarContractPurchasedPutsMember_documentation_en-US" xlink:label="lab_dec_TwoWayCollarContractPurchasedPutsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Way Collar Contract Purchased Puts</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_TwoWayCollarContractPurchasedPutsMember" xlink:href="dec-20250630.xsd#dec_TwoWayCollarContractPurchasedPutsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_TwoWayCollarContractPurchasedPutsMember" xlink:to="lab_dec_TwoWayCollarContractPurchasedPutsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearFourMember_376f5236-ceac-4683-b378-7b34ce3d823b_terseLabel_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearFourMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2029</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearFourMember_label_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearFourMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Four [Member]</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearFourMember_documentation_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearFourMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Four</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeInstrumentPeriodYearFourMember" xlink:href="dec-20250630.xsd#dec_DerivativeInstrumentPeriodYearFourMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeInstrumentPeriodYearFourMember" xlink:to="lab_dec_DerivativeInstrumentPeriodYearFourMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BorrowingCostsRecognisedAsExpense_d55661ff-b6ce-4fc7-8795-c56d9e12f2a6_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingCostsRecognisedAsExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_ifrs-full_BorrowingCostsRecognisedAsExpense_label_en-US" xlink:label="lab_ifrs-full_BorrowingCostsRecognisedAsExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowing costs recognised as expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingCostsRecognisedAsExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingCostsRecognisedAsExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BorrowingCostsRecognisedAsExpense" xlink:to="lab_ifrs-full_BorrowingCostsRecognisedAsExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSMaverickNotesClassA1Member_3e3838d5-c2c0-4e3c-b318-62527a32c9b0_terseLabel_en-US" xlink:label="lab_dec_ABSMaverickNotesClassA1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes, Class A-1</link:label>
    <link:label id="lab_dec_ABSMaverickNotesClassA1Member_label_en-US" xlink:label="lab_dec_ABSMaverickNotesClassA1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes, Class A-1 [Member]</link:label>
    <link:label id="lab_dec_ABSMaverickNotesClassA1Member_documentation_en-US" xlink:label="lab_dec_ABSMaverickNotesClassA1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes, Class A-1</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesLineItems_6fc63d44-7120-41e9-8e43-c3f272fc54d0_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, liabilities [line items]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesLineItems"/>
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    <link:label id="lab_dec_TradeReceivablesAndAccruedIncomeMember_64a8e130-4fa9-48b0-b37f-703f1f7c87aa_terseLabel_en-US" xlink:label="lab_dec_TradeReceivablesAndAccruedIncomeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade receivables, net</link:label>
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    <link:label id="lab_dec_TradeReceivablesAndAccruedIncomeMember_documentation_en-US" xlink:label="lab_dec_TradeReceivablesAndAccruedIncomeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Trade Receivables And Accrued Income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_TradeReceivablesAndAccruedIncomeMember" xlink:href="dec-20250630.xsd#dec_TradeReceivablesAndAccruedIncomeMember"/>
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    <link:label id="lab_ifrs-full_NoncurrentLeaseLiabilities_69fec701-b324-4f8e-9fa0-266f4e11ecfc_netLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_ifrs-full_NoncurrentLeaseLiabilities_label_en-US" xlink:label="lab_ifrs-full_NoncurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current lease liabilities</link:label>
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    <link:label id="lab_ifrs-full_GainsLossesOnDisposalsOfPropertyPlantAndEquipment_fae0acf8-1fd5-4f07-8fd9-0fbebb1000fb_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnDisposalsOfPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain (loss) on natural gas and oil property and equipment</link:label>
    <link:label id="lab_ifrs-full_GainsLossesOnDisposalsOfPropertyPlantAndEquipment_1ed913b5-d447-4bee-8d37-bf856716e037_verboseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnDisposalsOfPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Gains on disposals of property, plant and equipment</link:label>
    <link:label id="lab_ifrs-full_GainsLossesOnDisposalsOfPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_GainsLossesOnDisposalsOfPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gains (losses) on disposals of property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnDisposalsOfPropertyPlantAndEquipment" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesOnDisposalsOfPropertyPlantAndEquipment"/>
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    <link:label id="lab_dec_GainLossEarlyRetirementOfDebt_c543264f-d482-4607-97e4-371178062956_negatedTerseLabel_en-US" xlink:label="lab_dec_GainLossEarlyRetirementOfDebt" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Loss on early retirement of debt</link:label>
    <link:label id="lab_dec_GainLossEarlyRetirementOfDebt_label_en-US" xlink:label="lab_dec_GainLossEarlyRetirementOfDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) Early Retirement Of Debt</link:label>
    <link:label id="lab_dec_GainLossEarlyRetirementOfDebt_documentation_en-US" xlink:label="lab_dec_GainLossEarlyRetirementOfDebt" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Gain (Loss) Early Retirement Of Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_GainLossEarlyRetirementOfDebt" xlink:href="dec-20250630.xsd#dec_GainLossEarlyRetirementOfDebt"/>
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    <link:label id="lab_dec_DerivativeInstrumentPeriodYearSevenMember_d1179798-4b7f-4dd8-a810-69a93d0e9487_terseLabel_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearSevenMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2032</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearSevenMember_label_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearSevenMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Seven [Member]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeInstrumentPeriodYearSevenMember" xlink:href="dec-20250630.xsd#dec_DerivativeInstrumentPeriodYearSevenMember"/>
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    <link:label id="lab_dec_EmployeeBenefitTrustMember_9be09c72-0738-406e-a773-7254393cf56d_verboseLabel_en-US" xlink:label="lab_dec_EmployeeBenefitTrustMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Employee Benefit Trust</link:label>
    <link:label id="lab_dec_EmployeeBenefitTrustMember_6e5cc8e5-a5ba-4c01-8fdc-158769b05d75_terseLabel_en-US" xlink:label="lab_dec_EmployeeBenefitTrustMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBT</link:label>
    <link:label id="lab_dec_EmployeeBenefitTrustMember_label_en-US" xlink:label="lab_dec_EmployeeBenefitTrustMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Benefit Trust [Member]</link:label>
    <link:label id="lab_dec_EmployeeBenefitTrustMember_documentation_en-US" xlink:label="lab_dec_EmployeeBenefitTrustMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee Benefit Trust</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_EmployeeBenefitTrustMember" xlink:href="dec-20250630.xsd#dec_EmployeeBenefitTrustMember"/>
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    <link:label id="lab_dec_NumberOfNewSharesIssuedInThePeriod_83ee0954-c55c-4d64-a203-c31a2bbbf3d7_terseLabel_en-US" xlink:label="lab_dec_NumberOfNewSharesIssuedInThePeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of new shares issued in the period (in shares)</link:label>
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    <link:label id="lab_dec_OtherRestrictedCash_de2d6db8-78ec-466c-807e-cdc21e460815_terseLabel_en-US" xlink:label="lab_dec_OtherRestrictedCash" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other restricted cash</link:label>
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    <link:label id="lab_dec_OtherRestrictedCash_documentation_en-US" xlink:label="lab_dec_OtherRestrictedCash" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Restricted Cash</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherRestrictedCash" xlink:href="dec-20250630.xsd#dec_OtherRestrictedCash"/>
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    <link:label id="lab_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities_ab2fe904-9395-424d-96bc-883c82876560_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Consideration for asset acquisitions</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase of other long-term assets, classified as investing activities</link:label>
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    <link:label id="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill_545f7ced-67f2-4c63-98d2-8e76289b8ca7_terseLabel_en-US" xlink:label="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible assets</link:label>
    <link:label id="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill_label_en-US" xlink:label="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intangible assets other than goodwill</link:label>
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    <link:label id="lab_dec_DeferredFinancingCostsNettingMember_10667b9b-6a7e-4774-ae68-dc9b82344598_terseLabel_en-US" xlink:label="lab_dec_DeferredFinancingCostsNettingMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred financing costs</link:label>
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    <link:label id="lab_dec_DeferredFinancingCostsNettingMember_documentation_en-US" xlink:label="lab_dec_DeferredFinancingCostsNettingMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Deferred Financing Costs Netting</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DeferredFinancingCostsNettingMember" xlink:href="dec-20250630.xsd#dec_DeferredFinancingCostsNettingMember"/>
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    <link:label id="lab_ifrs-full_ExplanationOfMeasurementBasesForFinancialInstrumentsUsedInPreparingFinancialStatementsExplanatory_d7dc6e32-35e6-47bf-b652-ea6992f9cc1a_terseLabel_en-US" xlink:label="lab_ifrs-full_ExplanationOfMeasurementBasesForFinancialInstrumentsUsedInPreparingFinancialStatementsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement Basis</link:label>
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    <link:label id="lab_ifrs-full_NoncurrentDerivativeFinancialLiabilities_ce260099-9de5-4933-a267-75c8b5a336bc_verboseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentDerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Derivative financial instruments</link:label>
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    <link:label id="lab_dec_BorrowingsCovenantIfCertainPerformanceMetricsAchievedPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantIfCertainPerformanceMetricsAchievedPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, If Certain Performance Metrics Achieved, Percentage Of Excess Cash Flows That must Be Paid Towards Additional Principal</link:label>
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    <link:label id="lab_dec_NordicBondsMember_e1744915-1640-4b6d-9a11-9a9f25e1c579_terseLabel_en-US" xlink:label="lab_dec_NordicBondsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Nordic Bonds</link:label>
    <link:label id="lab_dec_NordicBondsMember_label_en-US" xlink:label="lab_dec_NordicBondsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nordic Bonds [Member]</link:label>
    <link:label id="lab_dec_NordicBondsMember_documentation_en-US" xlink:label="lab_dec_NordicBondsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nordic Bonds</link:label>
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    <link:label id="lab_ifrs-full_CashAndCashEquivalents_1f06831b-3dbc-4f6d-a6c6-bdadf64c41c1_terseLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_14ab79d9-5330-415c-bdbb-f873dedeaf45_periodStartLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents, beginning of period</link:label>
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    <link:label id="lab_ifrs-full_CashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalents"/>
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    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable_c3b61726-e3cf-403b-b233-d408febd629a_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of maturity analysis for derivative financial liabilities [table]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable"/>
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    <link:label id="lab_dec_WeightedAveragePriceBtuConversionFactor_5ae5b0a5-3d00-4176-bc73-9c30dcaa017f_terseLabel_en-US" xlink:label="lab_dec_WeightedAveragePriceBtuConversionFactor" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted Average Price, Btu Conversion Factor</link:label>
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    <link:label id="lab_ifrs-full_SwapContractMember_9b1b2b8e-b57a-44ac-951e-4e10370086f6_terseLabel_en-US" xlink:label="lab_ifrs-full_SwapContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Swaps</link:label>
    <link:label id="lab_ifrs-full_SwapContractMember_label_en-US" xlink:label="lab_ifrs-full_SwapContractMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Swap contract [member]</link:label>
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    <link:label id="lab_dec_CostsAssociatedWithAcquisitionsMember_2acf46b7-fb65-4571-986d-99320666b1e7_terseLabel_en-US" xlink:label="lab_dec_CostsAssociatedWithAcquisitionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Costs associated with acquisitions</link:label>
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    <link:label id="lab_dec_CostsAssociatedWithAcquisitionsMember_documentation_en-US" xlink:label="lab_dec_CostsAssociatedWithAcquisitionsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Costs Associated With Acquisitions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CostsAssociatedWithAcquisitionsMember" xlink:href="dec-20250630.xsd#dec_CostsAssociatedWithAcquisitionsMember"/>
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    <link:label id="lab_ifrs-full_AssetsAbstract_c5562939-1e91-48c6-8de0-6e88ebf63c5c_terseLabel_en-US" xlink:label="lab_ifrs-full_AssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ASSETS</link:label>
    <link:label id="lab_ifrs-full_AssetsAbstract_label_en-US" xlink:label="lab_ifrs-full_AssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [abstract]</link:label>
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    <link:label id="lab_ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares_74cf067e-691c-4398-93eb-92f24fbba31a_terseLabel_en-US" xlink:label="lab_ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shares authorized and reserved for issuance (in shares)</link:label>
    <link:label id="lab_ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares_label_en-US" xlink:label="lab_ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of shares reserved for issue under options and contracts for sale of shares</link:label>
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    <link:label id="lab_dec_OaktreeCapitalManagementMember_bf64b154-240b-4b17-a1fd-80a5e1e3ccdb_terseLabel_en-US" xlink:label="lab_dec_OaktreeCapitalManagementMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oaktree Capital Management</link:label>
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    <link:label id="lab_dec_OaktreeCapitalManagementMember_documentation_en-US" xlink:label="lab_dec_OaktreeCapitalManagementMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Oaktree Capital Management</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory_f1715789-45c5-4440-935a-f968d19a1315_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Borrowings</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesExplanatory_e8d36fa1-6048-496b-80b8-c44693fe22ee_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party Transactions</link:label>
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    <link:label id="lab_ifrs-full_EquityAndLiabilities_80999e74-bb46-4f02-aa05-9e824c670e5e_totalLabel_en-US" xlink:label="lab_ifrs-full_EquityAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total equity and liabilities</link:label>
    <link:label id="lab_ifrs-full_EquityAndLiabilities_label_en-US" xlink:label="lab_ifrs-full_EquityAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity and liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAndLiabilities"/>
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    <link:label id="lab_dec_RestrictedCashRecognizedAsOfAcquisitionDate_56d06ab6-d67e-409c-aa5b-804962abb48c_terseLabel_en-US" xlink:label="lab_dec_RestrictedCashRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted cash</link:label>
    <link:label id="lab_dec_RestrictedCashRecognizedAsOfAcquisitionDate_label_en-US" xlink:label="lab_dec_RestrictedCashRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Cash Recognized As Of Acquisition Date</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_RestrictedCashRecognizedAsOfAcquisitionDate" xlink:href="dec-20250630.xsd#dec_RestrictedCashRecognizedAsOfAcquisitionDate"/>
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    <link:label id="lab_ifrs-full_BusinessCombinationsAxis_8971d74e-33e0-4599-b4a3-03e8025b9987_terseLabel_en-US" xlink:label="lab_ifrs-full_BusinessCombinationsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business combinations [axis]</link:label>
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    <link:label id="lab_dec_TwoThousandSeventeenEquityIncentivePlanAndEmployeeSharePurchasePlanMember_b39a0466-78db-44fb-8103-f7b09cd7634f_terseLabel_en-US" xlink:label="lab_dec_TwoThousandSeventeenEquityIncentivePlanAndEmployeeSharePurchasePlanMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBT</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_GainsLossesOnUnsettledDerivatives" xlink:href="dec-20250630.xsd#dec_GainsLossesOnUnsettledDerivatives"/>
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    <link:label id="lab_dec_BorrowingsCovenantPeriod_87d3cff3-a30d-449e-9b0c-780f3caea695_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings, covenant period</link:label>
    <link:label id="lab_dec_BorrowingsCovenantPeriod_label_en-US" xlink:label="lab_dec_BorrowingsCovenantPeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant Period</link:label>
    <link:label id="lab_dec_BorrowingsCovenantPeriod_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantPeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantPeriod" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantPeriod" xlink:to="lab_dec_BorrowingsCovenantPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BusinessCombinationsDomain_50727a4a-7a5e-446d-b89f-cf1b709bb049_terseLabel_en-US" xlink:label="lab_ifrs-full_BusinessCombinationsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business combinations [domain]</link:label>
    <link:label id="lab_ifrs-full_BusinessCombinationsDomain_label_en-US" xlink:label="lab_ifrs-full_BusinessCombinationsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business combinations [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BusinessCombinationsDomain" xlink:to="lab_ifrs-full_BusinessCombinationsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_PluggingCostsOfAssetRetirementObligations_2168ba35-f920-43f4-acdf-986735b35d73_negatedTerseLabel_en-US" xlink:label="lab_dec_PluggingCostsOfAssetRetirementObligations" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Asset retirement costs</link:label>
    <link:label id="lab_dec_PluggingCostsOfAssetRetirementObligations_label_en-US" xlink:label="lab_dec_PluggingCostsOfAssetRetirementObligations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plugging Costs Of Asset Retirement Obligations</link:label>
    <link:label id="lab_dec_PluggingCostsOfAssetRetirementObligations_documentation_en-US" xlink:label="lab_dec_PluggingCostsOfAssetRetirementObligations" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Plugging Costs Of Asset Retirement Obligations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_PluggingCostsOfAssetRetirementObligations" xlink:href="dec-20250630.xsd#dec_PluggingCostsOfAssetRetirementObligations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_PluggingCostsOfAssetRetirementObligations" xlink:to="lab_dec_PluggingCostsOfAssetRetirementObligations" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentAssetsAbstract_b9452014-7a94-4ef2-a2bc-0714811dc74d_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current assets:</link:label>
    <link:label id="lab_ifrs-full_CurrentAssetsAbstract_label_en-US" xlink:label="lab_ifrs-full_CurrentAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current assets [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssetsAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentAssetsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentAssetsAbstract" xlink:to="lab_ifrs-full_CurrentAssetsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantTotalDebtToEBITDAXRatioMaximum_4c65591d-cd81-428f-b23f-3b9d5f2721f7_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantTotalDebtToEBITDAXRatioMaximum" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings covenant, maximum total debt to EBITDAX ratio</link:label>
    <link:label id="lab_dec_BorrowingsCovenantTotalDebtToEBITDAXRatioMaximum_label_en-US" xlink:label="lab_dec_BorrowingsCovenantTotalDebtToEBITDAXRatioMaximum" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Total Debt to EBITDAX Ratio, Maximum</link:label>
    <link:label id="lab_dec_BorrowingsCovenantTotalDebtToEBITDAXRatioMaximum_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantTotalDebtToEBITDAXRatioMaximum" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Total Debt to EBITDAX Ratio, Maximum</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantTotalDebtToEBITDAXRatioMaximum" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantTotalDebtToEBITDAXRatioMaximum"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantTotalDebtToEBITDAXRatioMaximum" xlink:to="lab_dec_BorrowingsCovenantTotalDebtToEBITDAXRatioMaximum" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressPostalZipCode_0573ec2b-2f1e-4b40-ae44-616920eb2fcc_terseLabel_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
    <link:label id="lab_dei_EntityAddressPostalZipCode_label_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressPostalZipCode" xlink:to="lab_dei_EntityAddressPostalZipCode" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSXNotesClassA1Member_022ffc31-65d1-46d2-8d3a-cd83dac70f47_terseLabel_en-US" xlink:label="lab_dec_ABSXNotesClassA1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS X Notes, Class A-1</link:label>
    <link:label id="lab_dec_ABSXNotesClassA1Member_label_en-US" xlink:label="lab_dec_ABSXNotesClassA1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS X Notes, Class A-1 [Member]</link:label>
    <link:label id="lab_dec_ABSXNotesClassA1Member_documentation_en-US" xlink:label="lab_dec_ABSXNotesClassA1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS X Notes, Class A-1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSXNotesClassA1Member" xlink:href="dec-20250630.xsd#dec_ABSXNotesClassA1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSXNotesClassA1Member" xlink:to="lab_dec_ABSXNotesClassA1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory_76a83f09-f30b-4544-9d82-080d44ba2717_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impairment of Financial Assets</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for impairment of financial assets [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RevenueAbstract_label_en-US" xlink:label="lab_ifrs-full_RevenueAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RevenueAbstract" xlink:to="lab_ifrs-full_RevenueAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentAssetsAbstract_30ad8215-0f66-41b1-95ff-ca5da2ff1b09_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-current assets:</link:label>
    <link:label id="lab_ifrs-full_NoncurrentAssetsAbstract_label_en-US" xlink:label="lab_ifrs-full_NoncurrentAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current assets [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentAssetsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentAssetsAbstract" xlink:to="lab_ifrs-full_NoncurrentAssetsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingFacilitiesRestrictedCashInterestReserve_09424160-a46b-4394-8784-fe2ca71ec324_negatedTerseLabel_en-US" xlink:label="lab_dec_BorrowingFacilitiesRestrictedCashInterestReserve" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Borrowing facilities, restricted cash interest reserve</link:label>
    <link:label id="lab_dec_BorrowingFacilitiesRestrictedCashInterestReserve_label_en-US" xlink:label="lab_dec_BorrowingFacilitiesRestrictedCashInterestReserve" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowing Facilities, Restricted Cash Interest Reserve</link:label>
    <link:label id="lab_dec_BorrowingFacilitiesRestrictedCashInterestReserve_documentation_en-US" xlink:label="lab_dec_BorrowingFacilitiesRestrictedCashInterestReserve" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowing Facilities, Restricted Cash Interest Reserve</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingFacilitiesRestrictedCashInterestReserve" xlink:href="dec-20250630.xsd#dec_BorrowingFacilitiesRestrictedCashInterestReserve"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingFacilitiesRestrictedCashInterestReserve" xlink:to="lab_dec_BorrowingFacilitiesRestrictedCashInterestReserve" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSVIIINotesClassA1Member_726f2a08-7c29-4085-8d10-bee757d34e34_terseLabel_en-US" xlink:label="lab_dec_ABSVIIINotesClassA1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS VIII Notes, Class A-1</link:label>
    <link:label id="lab_dec_ABSVIIINotesClassA1Member_label_en-US" xlink:label="lab_dec_ABSVIIINotesClassA1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS VIII Notes, Class A-1 [Member]</link:label>
    <link:label id="lab_dec_ABSVIIINotesClassA1Member_documentation_en-US" xlink:label="lab_dec_ABSVIIINotesClassA1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS VIII Notes, Class A-1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSVIIINotesClassA1Member" xlink:href="dec-20250630.xsd#dec_ABSVIIINotesClassA1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSVIIINotesClassA1Member" xlink:to="lab_dec_ABSVIIINotesClassA1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GeneralAndAdministrativeExpense_ab4a50a7-1ac6-4b15-8d78-fb27afebfd91_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_GeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">General and administrative expense</link:label>
    <link:label id="lab_ifrs-full_GeneralAndAdministrativeExpense_af1396b3-ef7f-4fb4-9d32-2f4f004f3bd3_terseLabel_en-US" xlink:label="lab_ifrs-full_GeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total G&amp;A</link:label>
    <link:label id="lab_ifrs-full_GeneralAndAdministrativeExpense_label_en-US" xlink:label="lab_ifrs-full_GeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General and administrative expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeneralAndAdministrativeExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeneralAndAdministrativeExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GeneralAndAdministrativeExpense" xlink:to="lab_ifrs-full_GeneralAndAdministrativeExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_74424e4e-c4d8-4f06-bc88-3d267c1f0669_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">LESS: Cash acquired</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:to="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory_308efbd8-462a-43b2-aa88-9f3b5df981d5_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Taxation</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of income tax [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIncomeTaxExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:to="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_20840914-9166-40ec-a8f8-ca8861c4e00a_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue Recognition</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for recognition of revenue [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_ProductsAndServicesDomain_045c5cd9-33ff-4067-9176-91c2b68f68e3_terseLabel_en-US" xlink:label="lab_srt_ProductsAndServicesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Product and Service [Domain]</link:label>
    <link:label id="lab_srt_ProductsAndServicesDomain_label_en-US" xlink:label="lab_srt_ProductsAndServicesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product and Service [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ProductsAndServicesDomain" xlink:to="lab_srt_ProductsAndServicesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OilAndGasAssetsMember_37c1e959-9ecc-48b6-990f-b70a01eeafb8_verboseLabel_en-US" xlink:label="lab_ifrs-full_OilAndGasAssetsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Oil and gas assets</link:label>
    <link:label id="lab_ifrs-full_OilAndGasAssetsMember_4161ecdd-b59e-435e-a6fe-12d9136b4351_terseLabel_en-US" xlink:label="lab_ifrs-full_OilAndGasAssetsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oil</link:label>
    <link:label id="lab_ifrs-full_OilAndGasAssetsMember_label_en-US" xlink:label="lab_ifrs-full_OilAndGasAssetsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil and gas assets [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OilAndGasAssetsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OilAndGasAssetsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OilAndGasAssetsMember" xlink:to="lab_ifrs-full_OilAndGasAssetsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsOnRevolvingLoan_a079b6d7-dbe5-4232-83c2-0417b5fb8705_terseLabel_en-US" xlink:label="lab_dec_BorrowingsOnRevolvingLoan" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings on revolving loan</link:label>
    <link:label id="lab_dec_BorrowingsOnRevolvingLoan_label_en-US" xlink:label="lab_dec_BorrowingsOnRevolvingLoan" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings On Revolving Loan</link:label>
    <link:label id="lab_dec_BorrowingsOnRevolvingLoan_documentation_en-US" xlink:label="lab_dec_BorrowingsOnRevolvingLoan" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings On Revolving Loan</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsOnRevolvingLoan" xlink:href="dec-20250630.xsd#dec_BorrowingsOnRevolvingLoan"/>
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    <link:label id="lab_dec_AssetAcquisitionConsiderationPaid_ec52790a-b738-45b4-b628-202b6648446c_terseLabel_en-US" xlink:label="lab_dec_AssetAcquisitionConsiderationPaid" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset acquisition, consideration paid</link:label>
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    <link:label id="lab_dec_AssetAcquisitionConsiderationPaid_documentation_en-US" xlink:label="lab_dec_AssetAcquisitionConsiderationPaid" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Consideration Paid</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetAcquisitionConsiderationPaid" xlink:href="dec-20250630.xsd#dec_AssetAcquisitionConsiderationPaid"/>
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    <link:label id="lab_ifrs-full_DisclosureOfAttributionOfExpensesByNatureToTheirFunctionTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfAttributionOfExpensesByNatureToTheirFunctionTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of attribution of expenses by nature to their function [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAttributionOfExpensesByNatureToTheirFunctionTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAttributionOfExpensesByNatureToTheirFunctionTable"/>
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    <link:label id="lab_dec_PaymentForRepurchasingShares_418ee61a-e803-484b-a8df-d863c0a5910c_terseLabel_en-US" xlink:label="lab_dec_PaymentForRepurchasingShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payment for repurchasing shares</link:label>
    <link:label id="lab_dec_PaymentForRepurchasingShares_label_en-US" xlink:label="lab_dec_PaymentForRepurchasingShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment For Repurchasing Shares</link:label>
    <link:label id="lab_dec_PaymentForRepurchasingShares_documentation_en-US" xlink:label="lab_dec_PaymentForRepurchasingShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payment For Repurchasing Shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_PaymentForRepurchasingShares" xlink:href="dec-20250630.xsd#dec_PaymentForRepurchasingShares"/>
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    <link:label id="lab_ifrs-full_MaturityAnalysisForNonderivativeFinancialLiabilities_1a640c05-6585-45f1-80b1-5364e996aa7e_verboseLabel_en-US" xlink:label="lab_ifrs-full_MaturityAnalysisForNonderivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Maturity of Borrowings</link:label>
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    <link:label id="lab_ifrs-full_InterestPaidClassifiedAsFinancingActivities_98ebe70d-18b0-4eda-8cb9-e5c0dfe57b7b_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Cash paid for interest</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestPaidClassifiedAsFinancingActivities"/>
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    <link:label id="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetReductionInScope1AndScope2GHGEmissions_9662348c-8f98-42a3-bfe1-9f9867499e05_terseLabel_en-US" xlink:label="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetReductionInScope1AndScope2GHGEmissions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sustainability-linked performance target, reduction in Scope 1 and Scope 2 GHG emissions</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsSustainabilityLinkedPerformanceTargetReductionInScope1AndScope2GHGEmissions" xlink:href="dec-20250630.xsd#dec_BorrowingsSustainabilityLinkedPerformanceTargetReductionInScope1AndScope2GHGEmissions"/>
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    <link:label id="lab_dec_ABSIXNotesMember_d71523b4-4e51-489e-9563-0018cbbc65c5_terseLabel_en-US" xlink:label="lab_dec_ABSIXNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS IX Notes</link:label>
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    <link:label id="lab_dec_ABSIXNotesMember_documentation_en-US" xlink:label="lab_dec_ABSIXNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS IX Notes</link:label>
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    <link:label id="lab_dec_DescriptionOfAccountingPolicyForBusinessCombinationsAndAssetAcquisitionsPolicyTextBlock_5f14657d-747e-4c9e-9342-0f28fe1ce8b3_terseLabel_en-US" xlink:label="lab_dec_DescriptionOfAccountingPolicyForBusinessCombinationsAndAssetAcquisitionsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Combinations and Asset Acquisitions</link:label>
    <link:label id="lab_dec_DescriptionOfAccountingPolicyForBusinessCombinationsAndAssetAcquisitionsPolicyTextBlock_label_en-US" xlink:label="lab_dec_DescriptionOfAccountingPolicyForBusinessCombinationsAndAssetAcquisitionsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for business combinations and asset acquisitions [Policy Text Block]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_DescriptionOfAccountingPolicyForBusinessCombinationsAndAssetAcquisitionsPolicyTextBlock" xlink:href="dec-20250630.xsd#dec_DescriptionOfAccountingPolicyForBusinessCombinationsAndAssetAcquisitionsPolicyTextBlock"/>
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    <link:label id="lab_dec_NumberOfClassesOfStock_c65e565d-db5d-4534-abea-9d30ffb55f12_terseLabel_en-US" xlink:label="lab_dec_NumberOfClassesOfStock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of classes of stock</link:label>
    <link:label id="lab_dec_NumberOfClassesOfStock_label_en-US" xlink:label="lab_dec_NumberOfClassesOfStock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Classes Of Stock</link:label>
    <link:label id="lab_dec_NumberOfClassesOfStock_documentation_en-US" xlink:label="lab_dec_NumberOfClassesOfStock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Classes Of Stock</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NumberOfClassesOfStock" xlink:href="dec-20250630.xsd#dec_NumberOfClassesOfStock"/>
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    <link:label id="lab_dec_PaymentsProvisionForDecommissioningRestorationAndRehabilitationCosts_a97bdfba-a544-426f-bd53-70f68434a2e6_negatedTerseLabel_en-US" xlink:label="lab_dec_PaymentsProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Asset retirement costs</link:label>
    <link:label id="lab_dec_PaymentsProvisionForDecommissioningRestorationAndRehabilitationCosts_label_en-US" xlink:label="lab_dec_PaymentsProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments, Provision For Decommissioning, Restoration And Rehabilitation Costs</link:label>
    <link:label id="lab_dec_PaymentsProvisionForDecommissioningRestorationAndRehabilitationCosts_documentation_en-US" xlink:label="lab_dec_PaymentsProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payments, Provision For Decommissioning, Restoration And Rehabilitation Costs</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory_0189c988-7bd6-400d-af7d-8b46bb61a28c_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value &amp; Financial Instruments</link:label>
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    <link:label id="lab_dec_ABSXFinancingAgreementMember_6588fb45-7325-44b5-8c4b-f89ba6c1b00a_terseLabel_en-US" xlink:label="lab_dec_ABSXFinancingAgreementMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS X Financing Agreement</link:label>
    <link:label id="lab_dec_ABSXFinancingAgreementMember_label_en-US" xlink:label="lab_dec_ABSXFinancingAgreementMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS X Financing Agreement [Member]</link:label>
    <link:label id="lab_dec_ABSXFinancingAgreementMember_documentation_en-US" xlink:label="lab_dec_ABSXFinancingAgreementMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS X Financing Agreement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSXFinancingAgreementMember" xlink:href="dec-20250630.xsd#dec_ABSXFinancingAgreementMember"/>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForRestrictedCashAndCashEquivalentsExplanatory_479a8420-7bc1-4fcb-aa5c-01f312fc577c_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForRestrictedCashAndCashEquivalentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted Cash</link:label>
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    <link:label id="lab_dec_ABSVIIClassANoteMember_4d41bf85-bf73-4ba6-a641-1720dfe183d5_terseLabel_en-US" xlink:label="lab_dec_ABSVIIClassANoteMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS VII Class A Notes</link:label>
    <link:label id="lab_dec_ABSVIIClassANoteMember_label_en-US" xlink:label="lab_dec_ABSVIIClassANoteMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS VII Class A Note [Member]</link:label>
    <link:label id="lab_dec_ABSVIIClassANoteMember_documentation_en-US" xlink:label="lab_dec_ABSVIIClassANoteMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS VII Class A Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSVIIClassANoteMember" xlink:href="dec-20250630.xsd#dec_ABSVIIClassANoteMember"/>
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    <link:label id="lab_dec_ProceedsFromLeaseModificationsClassifiedAsFinancingActivities_f559d0b0-c218-4146-9d90-b3752c002349_terseLabel_en-US" xlink:label="lab_dec_ProceedsFromLeaseModificationsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from lease modifications</link:label>
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    <link:label id="lab_dec_DividendsTable_3378dbf1-6582-4ef4-b618-3eb52a0128c1_terseLabel_en-US" xlink:label="lab_dec_DividendsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividends [Table]</link:label>
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    <link:label id="lab_dec_DividendsTable_documentation_en-US" xlink:label="lab_dec_DividendsTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Dividends</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DividendsTable" xlink:href="dec-20250630.xsd#dec_DividendsTable"/>
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    <link:label id="lab_dec_PaymentsForDerivativeInstrumentsFinancingActivities_5f0b5d31-cb44-4dd8-ba70-7726f6b4c7c7_terseLabel_en-US" xlink:label="lab_dec_PaymentsForDerivativeInstrumentsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payments for derivatives, financing activities</link:label>
    <link:label id="lab_dec_PaymentsForDerivativeInstrumentsFinancingActivities_label_en-US" xlink:label="lab_dec_PaymentsForDerivativeInstrumentsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments For Derivative Instruments, Financing Activities</link:label>
    <link:label id="lab_dec_PaymentsForDerivativeInstrumentsFinancingActivities_documentation_en-US" xlink:label="lab_dec_PaymentsForDerivativeInstrumentsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payments For Derivative Instruments, Financing Activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_PaymentsForDerivativeInstrumentsFinancingActivities" xlink:href="dec-20250630.xsd#dec_PaymentsForDerivativeInstrumentsFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_PaymentsForDerivativeInstrumentsFinancingActivities" xlink:to="lab_dec_PaymentsForDerivativeInstrumentsFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ReserveOfSharebasedPaymentsMember_c15eb3b5-95e7-4299-8d43-02c7612e597f_terseLabel_en-US" xlink:label="lab_ifrs-full_ReserveOfSharebasedPaymentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-Based Payment and Other Reserves</link:label>
    <link:label id="lab_ifrs-full_ReserveOfSharebasedPaymentsMember_label_en-US" xlink:label="lab_ifrs-full_ReserveOfSharebasedPaymentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reserve of share-based payments [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfSharebasedPaymentsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfSharebasedPaymentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ReserveOfSharebasedPaymentsMember" xlink:to="lab_ifrs-full_ReserveOfSharebasedPaymentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSMaverickNotesClassA2Member_e62b6bb9-346f-4058-884b-bfdbda50564f_terseLabel_en-US" xlink:label="lab_dec_ABSMaverickNotesClassA2Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes, Class A-2</link:label>
    <link:label id="lab_dec_ABSMaverickNotesClassA2Member_label_en-US" xlink:label="lab_dec_ABSMaverickNotesClassA2Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes, Class A-2 [Member]</link:label>
    <link:label id="lab_dec_ABSMaverickNotesClassA2Member_documentation_en-US" xlink:label="lab_dec_ABSMaverickNotesClassA2Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes, Class A-2</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSMaverickNotesClassA2Member" xlink:href="dec-20250630.xsd#dec_ABSMaverickNotesClassA2Member"/>
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    <link:label id="lab_ifrs-full_LaterThanFiveYearsMember_556df9f0-1422-4b6c-8dc5-ca22e9ece8c6_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Later than five years</link:label>
    <link:label id="lab_ifrs-full_LaterThanFiveYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Later than five years [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanFiveYearsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanFiveYearsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LaterThanFiveYearsMember" xlink:to="lab_ifrs-full_LaterThanFiveYearsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract_6b8b1409-1d53-4b81-a8d1-dc08e27f92e4_terseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities:</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) investing activities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:to="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DisclosureOfReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAndAverageEffectiveTaxRateTableTextBlock_b7523b39-38f0-42cd-a367-feecaa1fb572_terseLabel_en-US" xlink:label="lab_dec_DisclosureOfReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAndAverageEffectiveTaxRateTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of effective tax rates reconciliation</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_DisclosureOfReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAndAverageEffectiveTaxRateTableTextBlock" xlink:href="dec-20250630.xsd#dec_DisclosureOfReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAndAverageEffectiveTaxRateTableTextBlock"/>
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    <link:label id="lab_dec_StandAloneCallContractMember_fc84813c-3365-4d9c-8823-13798c0ea7cb_terseLabel_en-US" xlink:label="lab_dec_StandAloneCallContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stand-alone calls</link:label>
    <link:label id="lab_dec_StandAloneCallContractMember_label_en-US" xlink:label="lab_dec_StandAloneCallContractMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stand-Alone Call Contract [Member]</link:label>
    <link:label id="lab_dec_StandAloneCallContractMember_documentation_en-US" xlink:label="lab_dec_StandAloneCallContractMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Stand-Alone Call Contract</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_StandAloneCallContractMember" xlink:href="dec-20250630.xsd#dec_StandAloneCallContractMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_StandAloneCallContractMember" xlink:to="lab_dec_StandAloneCallContractMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DPLionEquityHoldcoLLCMember_e0df6fb2-bc3c-4b8d-ab14-ffa1d6e9ce25_terseLabel_en-US" xlink:label="lab_dec_DPLionEquityHoldcoLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">DP Lion Equity Holdco LLC</link:label>
    <link:label id="lab_dec_DPLionEquityHoldcoLLCMember_label_en-US" xlink:label="lab_dec_DPLionEquityHoldcoLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">DP Lion Equity Holdco LLC [Member]</link:label>
    <link:label id="lab_dec_DPLionEquityHoldcoLLCMember_documentation_en-US" xlink:label="lab_dec_DPLionEquityHoldcoLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">DP Lion Equity Holdco LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DPLionEquityHoldcoLLCMember" xlink:href="dec-20250630.xsd#dec_DPLionEquityHoldcoLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DPLionEquityHoldcoLLCMember" xlink:to="lab_dec_DPLionEquityHoldcoLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfFinancialAssetsDomain_09de70b3-0f98-4705-a336-c869dcbafcf4_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialAssetsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of financial assets</link:label>
    <link:label id="lab_ifrs-full_ClassesOfFinancialAssetsDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialAssetsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of financial assets [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
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    <link:label id="lab_dec_OtherRevenueMember_e6307e42-58d6-437c-9faf-6bbc8f015b88_terseLabel_en-US" xlink:label="lab_dec_OtherRevenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other revenue</link:label>
    <link:label id="lab_dec_OtherRevenueMember_label_en-US" xlink:label="lab_dec_OtherRevenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Revenue [Member]</link:label>
    <link:label id="lab_dec_OtherRevenueMember_documentation_en-US" xlink:label="lab_dec_OtherRevenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Revenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherRevenueMember" xlink:href="dec-20250630.xsd#dec_OtherRevenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OtherRevenueMember" xlink:to="lab_dec_OtherRevenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_StatementOfIFRSCompliance_d817ea2e-2672-4dbb-8437-eded963e4e44_terseLabel_en-US" xlink:label="lab_ifrs-full_StatementOfIFRSCompliance" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of Preparation</link:label>
    <link:label id="lab_ifrs-full_StatementOfIFRSCompliance_label_en-US" xlink:label="lab_ifrs-full_StatementOfIFRSCompliance" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of IFRS compliance [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfIFRSCompliance" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfIFRSCompliance"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_StatementOfIFRSCompliance" xlink:to="lab_ifrs-full_StatementOfIFRSCompliance" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InterestRateSwapContractMember_76b89983-cd9b-41bd-9532-f94f0546c138_terseLabel_en-US" xlink:label="lab_ifrs-full_InterestRateSwapContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">SOFR interest rate swap</link:label>
    <link:label id="lab_ifrs-full_InterestRateSwapContractMember_18a27db0-3d9f-4532-8848-73a23d3232cc_verboseLabel_en-US" xlink:label="lab_ifrs-full_InterestRateSwapContractMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Interest rate swaps</link:label>
    <link:label id="lab_ifrs-full_InterestRateSwapContractMember_label_en-US" xlink:label="lab_ifrs-full_InterestRateSwapContractMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest rate swap contract [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRateSwapContractMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateSwapContractMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InterestRateSwapContractMember" xlink:to="lab_ifrs-full_InterestRateSwapContractMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CurrentForeignTaxExpenseIncome_b48a9f40-4227-4750-bc16-de488e4af175_terseLabel_en-US" xlink:label="lab_dec_CurrentForeignTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign - UK (benefit) expense</link:label>
    <link:label id="lab_dec_CurrentForeignTaxExpenseIncome_label_en-US" xlink:label="lab_dec_CurrentForeignTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Foreign Tax Expense (Income)</link:label>
    <link:label id="lab_dec_CurrentForeignTaxExpenseIncome_documentation_en-US" xlink:label="lab_dec_CurrentForeignTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Current Foreign Tax Expense (Income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CurrentForeignTaxExpenseIncome" xlink:href="dec-20250630.xsd#dec_CurrentForeignTaxExpenseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CurrentForeignTaxExpenseIncome" xlink:to="lab_dec_CurrentForeignTaxExpenseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_NaturalGasReservesMember_ab8cd47b-47d7-424f-b67e-cc065d7a2db7_verboseLabel_en-US" xlink:label="lab_srt_NaturalGasReservesMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Natural gas</link:label>
    <link:label id="lab_srt_NaturalGasReservesMember_label_en-US" xlink:label="lab_srt_NaturalGasReservesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Natural Gas [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NaturalGasReservesMember" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NaturalGasReservesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_NaturalGasReservesMember" xlink:to="lab_srt_NaturalGasReservesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OperatingExpenseMeasurementInputMember_e375cbb1-3c51-4a0c-9615-972f2e227783_terseLabel_en-US" xlink:label="lab_dec_OperatingExpenseMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating expense</link:label>
    <link:label id="lab_dec_OperatingExpenseMeasurementInputMember_label_en-US" xlink:label="lab_dec_OperatingExpenseMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Expense, Measurement Input [Member]</link:label>
    <link:label id="lab_dec_OperatingExpenseMeasurementInputMember_documentation_en-US" xlink:label="lab_dec_OperatingExpenseMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Operating Expense, Measurement Input</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OperatingExpenseMeasurementInputMember" xlink:href="dec-20250630.xsd#dec_OperatingExpenseMeasurementInputMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OperatingExpenseMeasurementInputMember" xlink:to="lab_dec_OperatingExpenseMeasurementInputMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable_ccd12b52-c94d-4647-8b36-9dbe9771bc1b_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Issuance of new ordinary shares (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable_label_en-US" xlink:label="lab_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of instruments or interests issued or issuable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable" xlink:to="lab_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents_3494ef1e-1c9d-4610-a069-154f92194781_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for determining components of cash and cash equivalents [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives_f0d49f61-a12f-41da-888e-3b7e9e077532_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain (loss) on derivative financial instruments</link:label>
    <link:label id="lab_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives_48093e81-9e65-4486-91eb-f5cf8a83139f_totalLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total gain (loss) on derivative financial instruments</link:label>
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    <link:label id="lab_dec_DisclosureOfBasisOfPreparationOfFinancialStatementsAbstract_e919b42f-62d4-40a8-a544-d66a3a326d0a_terseLabel_en-US" xlink:label="lab_dec_DisclosureOfBasisOfPreparationOfFinancialStatementsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of basis of preparation of financial statements [Abstract]</link:label>
    <link:label id="lab_dec_DisclosureOfBasisOfPreparationOfFinancialStatementsAbstract_label_en-US" xlink:label="lab_dec_DisclosureOfBasisOfPreparationOfFinancialStatementsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of basis of preparation of financial statements [Abstract]</link:label>
    <link:label id="lab_dec_DisclosureOfBasisOfPreparationOfFinancialStatementsAbstract_documentation_en-US" xlink:label="lab_dec_DisclosureOfBasisOfPreparationOfFinancialStatementsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure of basis of preparation of financial statements [Abstract]</link:label>
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    <link:label id="lab_ifrs-full_RepaymentsOfNoncurrentBorrowings_f3104397-9fab-4349-a9e8-0dcd0bcf9d60_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_RepaymentsOfNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Repayments of borrowings</link:label>
    <link:label id="lab_ifrs-full_RepaymentsOfNoncurrentBorrowings_label_en-US" xlink:label="lab_ifrs-full_RepaymentsOfNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of non-current borrowings</link:label>
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    <link:label id="lab_dec_NumberOfSharesOutstandingGrossOfShareRepurchases_78b6856a-d4f9-42ab-ba76-f0ba1d934a17_terseLabel_en-US" xlink:label="lab_dec_NumberOfSharesOutstandingGrossOfShareRepurchases" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shares Outstanding (in shares)</link:label>
    <link:label id="lab_dec_NumberOfSharesOutstandingGrossOfShareRepurchases_label_en-US" xlink:label="lab_dec_NumberOfSharesOutstandingGrossOfShareRepurchases" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Shares Outstanding, Gross Of Share Repurchases</link:label>
    <link:label id="lab_dec_NumberOfSharesOutstandingGrossOfShareRepurchases_documentation_en-US" xlink:label="lab_dec_NumberOfSharesOutstandingGrossOfShareRepurchases" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Shares Outstanding, Gross Of Share Repurchases</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NumberOfSharesOutstandingGrossOfShareRepurchases" xlink:href="dec-20250630.xsd#dec_NumberOfSharesOutstandingGrossOfShareRepurchases"/>
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    <link:label id="lab_ifrs-full_ReconciliationOfNumberOfSharesOutstandingAbstract_e9db1a58-3b4c-4732-80c4-5c6a524de266_terseLabel_en-US" xlink:label="lab_ifrs-full_ReconciliationOfNumberOfSharesOutstandingAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of Shares</link:label>
    <link:label id="lab_ifrs-full_ReconciliationOfNumberOfSharesOutstandingAbstract_label_en-US" xlink:label="lab_ifrs-full_ReconciliationOfNumberOfSharesOutstandingAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reconciliation of number of shares outstanding [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfNumberOfSharesOutstandingAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReconciliationOfNumberOfSharesOutstandingAbstract"/>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_84a071d8-c569-4e68-9acc-d86c124ec0db_verboseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Issuance of shares and share capital</link:label>
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    <link:label id="lab_dec_ABSIIINoteMember_39c2a944-1b9c-4762-8817-05f70ac6fc88_terseLabel_en-US" xlink:label="lab_dec_ABSIIINoteMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS III Notes</link:label>
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    <link:label id="lab_dec_ABSIIINoteMember_documentation_en-US" xlink:label="lab_dec_ABSIIINoteMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS III Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSIIINoteMember" xlink:href="dec-20250630.xsd#dec_ABSIIINoteMember"/>
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    <link:label id="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts_4674d161-4287-4211-b3b3-04b66e5c3996_periodStartLabel_en-US" xlink:label="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at beginning of period</link:label>
    <link:label id="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts_88e12be7-b4fe-4a66-b8ad-10ffd6935cc4_periodEndLabel_en-US" xlink:label="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance at end of period</link:label>
    <link:label id="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts_label_en-US" xlink:label="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Provision for decommissioning, restoration and rehabilitation costs</link:label>
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    <link:label id="lab_dec_OCMDenaliHoldingsLLCMember_1eb044ce-e73e-4c92-811a-3db4ee6d05e9_terseLabel_en-US" xlink:label="lab_dec_OCMDenaliHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">OCM Denali Holdings LLC</link:label>
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    <link:label id="lab_dec_OCMDenaliHoldingsLLCMember_documentation_en-US" xlink:label="lab_dec_OCMDenaliHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">OCM Denali Holdings LLC</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfClassesOfShareCapitalTable_8449d926-3a07-4212-b4fd-69c013450066_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of classes of share capital [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfClassesOfShareCapitalTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of classes of share capital [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
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    <link:label id="lab_ifrs-full_UnobservableInputsAxis_a6ecfa2c-1183-47d9-ab4a-d8611ba17eb7_terseLabel_en-US" xlink:label="lab_ifrs-full_UnobservableInputsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unobservable inputs [axis]</link:label>
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    <link:label id="lab_dec_NumberOfVotesPerShare_215ca76c-45d4-495f-89fe-4243c1d8c6f4_terseLabel_en-US" xlink:label="lab_dec_NumberOfVotesPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of votes per share</link:label>
    <link:label id="lab_dec_NumberOfVotesPerShare_label_en-US" xlink:label="lab_dec_NumberOfVotesPerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Votes Per Share</link:label>
    <link:label id="lab_dec_NumberOfVotesPerShare_documentation_en-US" xlink:label="lab_dec_NumberOfVotesPerShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Votes Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NumberOfVotesPerShare" xlink:href="dec-20250630.xsd#dec_NumberOfVotesPerShare"/>
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    <link:label id="lab_ifrs-full_NoncurrentAssets_eacbaa1c-3ba0-4c0a-bfc5-b17548dd169a_totalLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total non-current assets</link:label>
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    <link:label id="lab_dec_ShareBuybackProgramMember_f295cc70-7d5e-4300-8ab0-4e2e7ee8cd49_terseLabel_en-US" xlink:label="lab_dec_ShareBuybackProgramMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share buyback program</link:label>
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    <link:label id="lab_dec_ShareBuybackProgramMember_documentation_en-US" xlink:label="lab_dec_ShareBuybackProgramMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share Buyback Program</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ShareBuybackProgramMember" xlink:href="dec-20250630.xsd#dec_ShareBuybackProgramMember"/>
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    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems_080ec9cc-4745-4674-af25-3cc8ca122c34_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of maturity analysis for derivative financial liabilities [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of maturity analysis for derivative financial liabilities [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems"/>
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    <link:label id="lab_ifrs-full_ShareIssueRelatedCost_06e08de1-3287-46fe-9d44-0c86ef236268_terseLabel_en-US" xlink:label="lab_ifrs-full_ShareIssueRelatedCost" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share issue related cost</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_ec2198ce-145f-471a-a135-793ce5f38a80_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of property, plant and equipment [axis]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems_ce69170b-4859-401d-aa7c-99f6002f5add_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of disaggregation of revenue from contracts with customers [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of disaggregation of revenue from contracts with customers [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems" xlink:to="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_60014d42-ca94-42cd-b5fc-f64f81acbb69_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of property, plant and equipment [domain]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of property, plant and equipment [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CovenantSixMember_080b50a8-05f7-4434-b242-236afeaba825_terseLabel_en-US" xlink:label="lab_dec_CovenantSixMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Covenant Six</link:label>
    <link:label id="lab_dec_CovenantSixMember_label_en-US" xlink:label="lab_dec_CovenantSixMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Covenant Six [Member]</link:label>
    <link:label id="lab_dec_CovenantSixMember_documentation_en-US" xlink:label="lab_dec_CovenantSixMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Covenant Six</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CovenantSixMember" xlink:href="dec-20250630.xsd#dec_CovenantSixMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CovenantSixMember" xlink:to="lab_dec_CovenantSixMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OriginalIssueDiscountsNettingMember_73e2b56c-6e1b-4223-8952-4bcd9f3cad8a_terseLabel_en-US" xlink:label="lab_dec_OriginalIssueDiscountsNettingMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Original issue discounts</link:label>
    <link:label id="lab_dec_OriginalIssueDiscountsNettingMember_label_en-US" xlink:label="lab_dec_OriginalIssueDiscountsNettingMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Original Issue Discounts Netting [Member]</link:label>
    <link:label id="lab_dec_OriginalIssueDiscountsNettingMember_documentation_en-US" xlink:label="lab_dec_OriginalIssueDiscountsNettingMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Original Issue Discounts Netting</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OriginalIssueDiscountsNettingMember" xlink:href="dec-20250630.xsd#dec_OriginalIssueDiscountsNettingMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OriginalIssueDiscountsNettingMember" xlink:to="lab_dec_OriginalIssueDiscountsNettingMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OtherNonCurrentAssetsRecognizedAsOfAcquisitionDate_1d39fac4-aada-41c6-bc32-282f159de1c5_terseLabel_en-US" xlink:label="lab_dec_OtherNonCurrentAssetsRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other non-current assets</link:label>
    <link:label id="lab_dec_OtherNonCurrentAssetsRecognizedAsOfAcquisitionDate_label_en-US" xlink:label="lab_dec_OtherNonCurrentAssetsRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Non-Current Assets Recognized As Of Acquisition Date</link:label>
    <link:label id="lab_dec_OtherNonCurrentAssetsRecognizedAsOfAcquisitionDate_documentation_en-US" xlink:label="lab_dec_OtherNonCurrentAssetsRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Non-Current Assets Recognized As Of Acquisition Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherNonCurrentAssetsRecognizedAsOfAcquisitionDate" xlink:href="dec-20250630.xsd#dec_OtherNonCurrentAssetsRecognizedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OtherNonCurrentAssetsRecognizedAsOfAcquisitionDate" xlink:to="lab_dec_OtherNonCurrentAssetsRecognizedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressStateOrProvince_7da26ec5-ea0b-4889-b854-c3309594a73c_terseLabel_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, State or Province</link:label>
    <link:label id="lab_dei_EntityAddressStateOrProvince_label_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, State or Province</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressStateOrProvince" xlink:to="lab_dei_EntityAddressStateOrProvince" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantIfCashFlowInExcessOfRequiredPaymentsPercentageOfExcessCashFlowRequiredToBePaid_a1f36d01-961e-4c80-a17b-96e59cfeed6f_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantIfCashFlowInExcessOfRequiredPaymentsPercentageOfExcessCashFlowRequiredToBePaid" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of excess payments to be made if performance metrics are met</link:label>
    <link:label id="lab_dec_BorrowingsCovenantIfCashFlowInExcessOfRequiredPaymentsPercentageOfExcessCashFlowRequiredToBePaid_label_en-US" xlink:label="lab_dec_BorrowingsCovenantIfCashFlowInExcessOfRequiredPaymentsPercentageOfExcessCashFlowRequiredToBePaid" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, If Cash Flow In Excess Of Required Payments, Percentage Of Excess Cash Flow Required To Be Paid</link:label>
    <link:label id="lab_dec_BorrowingsCovenantIfCashFlowInExcessOfRequiredPaymentsPercentageOfExcessCashFlowRequiredToBePaid_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantIfCashFlowInExcessOfRequiredPaymentsPercentageOfExcessCashFlowRequiredToBePaid" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, If Cash Flow In Excess Of Required Payments, Percentage Of Excess Cash Flow Required To Be Paid</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantIfCashFlowInExcessOfRequiredPaymentsPercentageOfExcessCashFlowRequiredToBePaid" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantIfCashFlowInExcessOfRequiredPaymentsPercentageOfExcessCashFlowRequiredToBePaid"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantIfCashFlowInExcessOfRequiredPaymentsPercentageOfExcessCashFlowRequiredToBePaid" xlink:to="lab_dec_BorrowingsCovenantIfCashFlowInExcessOfRequiredPaymentsPercentageOfExcessCashFlowRequiredToBePaid" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_6c53f01f-c209-4963-96a7-9e0f5126a430_totalLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Transactions with shareholders</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) through transactions with owners, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MajorOrdinaryShareTransactionsMember_808aa9b4-9fd5-4b7f-ac9b-2ab1a0cbf135_terseLabel_en-US" xlink:label="lab_ifrs-full_MajorOrdinaryShareTransactionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Major ordinary share transactions</link:label>
    <link:label id="lab_ifrs-full_MajorOrdinaryShareTransactionsMember_label_en-US" xlink:label="lab_ifrs-full_MajorOrdinaryShareTransactionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Major ordinary share transactions [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MajorOrdinaryShareTransactionsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorOrdinaryShareTransactionsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MajorOrdinaryShareTransactionsMember" xlink:to="lab_ifrs-full_MajorOrdinaryShareTransactionsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_TimingMeasurementInputMember_77f83283-7b57-4cdc-b72d-5d8de06ab89e_terseLabel_en-US" xlink:label="lab_dec_TimingMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Timing</link:label>
    <link:label id="lab_dec_TimingMeasurementInputMember_label_en-US" xlink:label="lab_dec_TimingMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Timing, Measurement Input [Member]</link:label>
    <link:label id="lab_dec_TimingMeasurementInputMember_documentation_en-US" xlink:label="lab_dec_TimingMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Timing, Measurement Input</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_TimingMeasurementInputMember" xlink:href="dec-20250630.xsd#dec_TimingMeasurementInputMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_TimingMeasurementInputMember" xlink:to="lab_dec_TimingMeasurementInputMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeLiabilityAssetOffset_d82fa5e9-1827-4898-9bf1-9cb15cf4657a_totalLabel_en-US" xlink:label="lab_dec_DerivativeLiabilityAssetOffset" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total liabilities</link:label>
    <link:label id="lab_dec_DerivativeLiabilityAssetOffset_label_en-US" xlink:label="lab_dec_DerivativeLiabilityAssetOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Asset Offset</link:label>
    <link:label id="lab_dec_DerivativeLiabilityAssetOffset_documentation_en-US" xlink:label="lab_dec_DerivativeLiabilityAssetOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Liability, Asset Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeLiabilityAssetOffset" xlink:href="dec-20250630.xsd#dec_DerivativeLiabilityAssetOffset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeLiabilityAssetOffset" xlink:to="lab_dec_DerivativeLiabilityAssetOffset" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DisclosureOfMajorComponentsOfTaxExpenseIncomeTextBlock_c1076d29-2139-4ca0-a3d9-ecd1992f3c3d_terseLabel_en-US" xlink:label="lab_dec_DisclosureOfMajorComponentsOfTaxExpenseIncomeTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of provision for income taxes</link:label>
    <link:label id="lab_dec_DisclosureOfMajorComponentsOfTaxExpenseIncomeTextBlock_label_en-US" xlink:label="lab_dec_DisclosureOfMajorComponentsOfTaxExpenseIncomeTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Major Components Of Tax Expense (Income) [Text Block]</link:label>
    <link:label id="lab_dec_DisclosureOfMajorComponentsOfTaxExpenseIncomeTextBlock_documentation_en-US" xlink:label="lab_dec_DisclosureOfMajorComponentsOfTaxExpenseIncomeTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure Of Major Components Of Tax Expense (Income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DisclosureOfMajorComponentsOfTaxExpenseIncomeTextBlock" xlink:href="dec-20250630.xsd#dec_DisclosureOfMajorComponentsOfTaxExpenseIncomeTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DisclosureOfMajorComponentsOfTaxExpenseIncomeTextBlock" xlink:to="lab_dec_DisclosureOfMajorComponentsOfTaxExpenseIncomeTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantDebtServiceCoverageRatio_807f0870-20a7-4b66-a7b8-e37813fface6_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantDebtServiceCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt service coverage ratio</link:label>
    <link:label id="lab_dec_BorrowingsCovenantDebtServiceCoverageRatio_label_en-US" xlink:label="lab_dec_BorrowingsCovenantDebtServiceCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Debt Service Coverage Ratio</link:label>
    <link:label id="lab_dec_BorrowingsCovenantDebtServiceCoverageRatio_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantDebtServiceCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Debt Service Coverage Ratio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantDebtServiceCoverageRatio" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantDebtServiceCoverageRatio"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantDebtServiceCoverageRatio" xlink:to="lab_dec_BorrowingsCovenantDebtServiceCoverageRatio" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromDisposalOfOilAndGasAssets_fafb26eb-1b8a-40ba-92f5-4f0f86d6f95f_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromDisposalOfOilAndGasAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds on disposals of natural gas and oil properties and equipment</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromDisposalOfOilAndGasAssets_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromDisposalOfOilAndGasAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from disposal of oil and gas assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromDisposalOfOilAndGasAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromDisposalOfOilAndGasAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromDisposalOfOilAndGasAssets" xlink:to="lab_ifrs-full_ProceedsFromDisposalOfOilAndGasAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_8ced0fb1-44f2-41f9-aa02-90a7aefc152d_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ScheduleOfDecommissioningRestorationAndRehabilitationProvisionsTableTextBlock_1c4eb3cd-3a33-4640-8dc0-8fe46fb98d61_terseLabel_en-US" xlink:label="lab_dec_ScheduleOfDecommissioningRestorationAndRehabilitationProvisionsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Provision for Asset Retirement Obligations</link:label>
    <link:label id="lab_dec_ScheduleOfDecommissioningRestorationAndRehabilitationProvisionsTableTextBlock_label_en-US" xlink:label="lab_dec_ScheduleOfDecommissioningRestorationAndRehabilitationProvisionsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Decommissioning, Restoration And Rehabilitation Provisions [Table Text Block]</link:label>
    <link:label id="lab_dec_ScheduleOfDecommissioningRestorationAndRehabilitationProvisionsTableTextBlock_documentation_en-US" xlink:label="lab_dec_ScheduleOfDecommissioningRestorationAndRehabilitationProvisionsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule Of Decommissioning, Restoration And Rehabilitation Provisions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ScheduleOfDecommissioningRestorationAndRehabilitationProvisionsTableTextBlock" xlink:href="dec-20250630.xsd#dec_ScheduleOfDecommissioningRestorationAndRehabilitationProvisionsTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ScheduleOfDecommissioningRestorationAndRehabilitationProvisionsTableTextBlock" xlink:to="lab_dec_ScheduleOfDecommissioningRestorationAndRehabilitationProvisionsTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PaymentsForDebtIssueCosts_3b7ec07e-afe4-4b1e-8360-2267c6dd93ee_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_PaymentsForDebtIssueCosts" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Debt issuance cost</link:label>
    <link:label id="lab_ifrs-full_PaymentsForDebtIssueCosts_label_en-US" xlink:label="lab_ifrs-full_PaymentsForDebtIssueCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for debt issue costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsForDebtIssueCosts" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PaymentsForDebtIssueCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PaymentsForDebtIssueCosts" xlink:to="lab_ifrs-full_PaymentsForDebtIssueCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentLiabilitiesAbstract_903b3196-0ecb-4f83-87c7-5512df763b57_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-current liabilities:</link:label>
    <link:label id="lab_ifrs-full_NoncurrentLiabilitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current liabilities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentLiabilitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentLiabilitiesAbstract" xlink:to="lab_ifrs-full_NoncurrentLiabilitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityDomain_4c209010-673f-4819-80b2-d4d7bd4994fe_terseLabel_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
    <link:label id="lab_dei_EntityDomain_label_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityDomain" xlink:to="lab_dei_EntityDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CreditFacilityLettersOfCreditMember_138c02e6-25ff-4462-9c06-3054cfe5bcc9_terseLabel_en-US" xlink:label="lab_dec_CreditFacilityLettersOfCreditMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility, letters of credit</link:label>
    <link:label id="lab_dec_CreditFacilityLettersOfCreditMember_label_en-US" xlink:label="lab_dec_CreditFacilityLettersOfCreditMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility, Letters Of Credit [Member]</link:label>
    <link:label id="lab_dec_CreditFacilityLettersOfCreditMember_documentation_en-US" xlink:label="lab_dec_CreditFacilityLettersOfCreditMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Credit Facility, Letters Of Credit</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CreditFacilityLettersOfCreditMember" xlink:href="dec-20250630.xsd#dec_CreditFacilityLettersOfCreditMember"/>
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    <link:label id="lab_ifrs-full_DisclosureOfRevenueExplanatory_d613ab5e-8edd-40b9-8f6a-87dbbeb17d4a_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfRevenueExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfRevenueExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfRevenueExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of revenue [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfRevenueExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfRevenueExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfRevenueExplanatory" xlink:to="lab_ifrs-full_DisclosureOfRevenueExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentFiscalYearFocus_4d62a08c-0d96-4dc3-9492-a117a8e09edc_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:label id="lab_dei_DocumentFiscalYearFocus_label_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
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    <link:label id="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract_b3bd754c-e22a-402f-9396-be02f6752ce0_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operations reconciliation:</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile profit (loss) [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForReconcileProfitLossAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:to="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughOtherDistributionsToOwners_8018f5e8-7f02-4af2-a43a-e69f2becb2f3_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughOtherDistributionsToOwners" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Distributions to non-controlling interest owners</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughOtherDistributionsToOwners_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughOtherDistributionsToOwners" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Decrease through other distributions to owners, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughOtherDistributionsToOwners" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughOtherDistributionsToOwners"/>
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    <link:label id="lab_dec_TaxRateEffectOfTaxCredits_5ef89a95-1a02-49bd-b294-f3a7b38c2363_terseLabel_en-US" xlink:label="lab_dec_TaxRateEffectOfTaxCredits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Federal credits (a)</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_TaxRateEffectOfTaxCredits" xlink:href="dec-20250630.xsd#dec_TaxRateEffectOfTaxCredits"/>
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    <link:label id="lab_dec_CovenantOneMember_7751efc0-5278-4db6-a9d9-ead3fa5ac63b_terseLabel_en-US" xlink:label="lab_dec_CovenantOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Covenant One</link:label>
    <link:label id="lab_dec_CovenantOneMember_label_en-US" xlink:label="lab_dec_CovenantOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Covenant One [Member]</link:label>
    <link:label id="lab_dec_CovenantOneMember_documentation_en-US" xlink:label="lab_dec_CovenantOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Covenant One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CovenantOneMember" xlink:href="dec-20250630.xsd#dec_CovenantOneMember"/>
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    <link:label id="lab_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate_6e120053-4a87-48e4-ad5e-0795b3e7edfa_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current assets</link:label>
    <link:label id="lab_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current assets recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate"/>
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    <link:label id="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForChangeInDiscountRateProvisionForDecommissioningRestorationAndRehabilitationCosts_f2c17774-4ff3-450a-a1f5-8ffaf2dd4ba6_negatedLabel_en-US" xlink:label="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForChangeInDiscountRateProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">(Decrease) in liability to do a change in the discount rate</link:label>
    <link:label id="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForChangeInDiscountRateProvisionForDecommissioningRestorationAndRehabilitationCosts_label_en-US" xlink:label="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForChangeInDiscountRateProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) Through Revision To Estimate For Change In Discount Rate, Provision For Decommissioning, Restoration And Rehabilitation Costs</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_IncreaseDecreaseThroughRevisionToEstimateForChangeInDiscountRateProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:href="dec-20250630.xsd#dec_IncreaseDecreaseThroughRevisionToEstimateForChangeInDiscountRateProvisionForDecommissioningRestorationAndRehabilitationCosts"/>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleIncreaseInUnobservableInputLiabilities_3fa25e5d-2bf3-4cfb-9fd0-465bca418f0b_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleIncreaseInUnobservableInputLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in asset retirement obligation due to reasonably possible 10% increase in measurement input</link:label>
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    <link:label id="lab_ifrs-full_ShorttermProvisionForDecommissioningRestorationAndRehabilitationCosts_8f8a5764-15d7-402d-a2f7-dac8fe58dd84_terseLabel_en-US" xlink:label="lab_ifrs-full_ShorttermProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LESS: Current asset retirement obligations</link:label>
    <link:label id="lab_ifrs-full_ShorttermProvisionForDecommissioningRestorationAndRehabilitationCosts_label_en-US" xlink:label="lab_ifrs-full_ShorttermProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current provision for decommissioning, restoration and rehabilitation costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShorttermProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShorttermProvisionForDecommissioningRestorationAndRehabilitationCosts"/>
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    <link:label id="lab_dec_BorrowingsCashPaidForInterest_64c6dd8f-80d3-42fa-bc35-837d2650965c_negatedTerseLabel_en-US" xlink:label="lab_dec_BorrowingsCashPaidForInterest" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Cash paid for interest</link:label>
    <link:label id="lab_dec_BorrowingsCashPaidForInterest_label_en-US" xlink:label="lab_dec_BorrowingsCashPaidForInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings Cash Paid for Interest</link:label>
    <link:label id="lab_dec_BorrowingsCashPaidForInterest_documentation_en-US" xlink:label="lab_dec_BorrowingsCashPaidForInterest" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings Cash Paid for Interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCashPaidForInterest" xlink:href="dec-20250630.xsd#dec_BorrowingsCashPaidForInterest"/>
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    <link:label id="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesTable_4686fc28-d45c-4b2a-bc88-366ea463dadb_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, liabilities [table]</link:label>
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    <link:label id="lab_dec_GrossProceedsFromIssuingShares_c48ed288-f992-42d1-883f-d5e1c26c7fc2_terseLabel_en-US" xlink:label="lab_dec_GrossProceedsFromIssuingShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross proceeds</link:label>
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    <link:label id="lab_dec_GrossProceedsFromIssuingShares_documentation_en-US" xlink:label="lab_dec_GrossProceedsFromIssuingShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Gross Proceeds From Issuing Shares</link:label>
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    <link:label id="lab_dec_DeferredFederalIncomeTaxExpenseIncome_723b2f9d-fda5-4d5f-9759-c9befd10d562_terseLabel_en-US" xlink:label="lab_dec_DeferredFederalIncomeTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Federal (benefit) expense</link:label>
    <link:label id="lab_dec_DeferredFederalIncomeTaxExpenseIncome_label_en-US" xlink:label="lab_dec_DeferredFederalIncomeTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Federal Income Tax Expense (Income)</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_DeferredFederalIncomeTaxExpenseIncome" xlink:href="dec-20250630.xsd#dec_DeferredFederalIncomeTaxExpenseIncome"/>
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    <link:label id="lab_ifrs-full_ConsiderationPaidReceived_bc5052e6-c68b-4be7-96a0-70a74acf4d75_terseLabel_en-US" xlink:label="lab_ifrs-full_ConsiderationPaidReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consideration paid (received)</link:label>
    <link:label id="lab_ifrs-full_ConsiderationPaidReceived_d4d44f31-b4db-4a4b-8079-a147d731afbf_negatedLabel_en-US" xlink:label="lab_ifrs-full_ConsiderationPaidReceived" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Consideration received</link:label>
    <link:label id="lab_ifrs-full_ConsiderationPaidReceived_label_en-US" xlink:label="lab_ifrs-full_ConsiderationPaidReceived" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consideration paid (received)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ConsiderationPaidReceived" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ConsiderationPaidReceived"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ConsiderationPaidReceived" xlink:to="lab_ifrs-full_ConsiderationPaidReceived" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParentMember_58708a87-e055-453b-9982-8ccc4afa3ec4_terseLabel_en-US" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Attributable to Owners of the Parent</link:label>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParentMember_label_en-US" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity attributable to owners of parent [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:to="lab_ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinanceCosts_5d31f88f-81f4-4275-b367-8c34cc774ef4_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Finance costs</link:label>
    <link:label id="lab_ifrs-full_FinanceCosts_5551d0fa-eeed-4a25-9f3b-ff31548a8a91_totalLabel_en-US" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total finance costs</link:label>
    <link:label id="lab_ifrs-full_FinanceCosts_label_en-US" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceCosts" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinanceCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinanceCosts" xlink:to="lab_ifrs-full_FinanceCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeInstrumentPeriodRemainderOfFiscalYearMember_59af3b68-b61b-443f-a815-c84fa7729c00_terseLabel_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodRemainderOfFiscalYearMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">For the remainder of 2025</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodRemainderOfFiscalYearMember_label_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodRemainderOfFiscalYearMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Remainder Of Fiscal Year [Member]</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodRemainderOfFiscalYearMember_documentation_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodRemainderOfFiscalYearMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Remainder Of Fiscal Year</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeInstrumentPeriodRemainderOfFiscalYearMember" xlink:href="dec-20250630.xsd#dec_DerivativeInstrumentPeriodRemainderOfFiscalYearMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeInstrumentPeriodRemainderOfFiscalYearMember" xlink:to="lab_dec_DerivativeInstrumentPeriodRemainderOfFiscalYearMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TypesOfInterestRatesDomain_635faf8a-17bd-4fc7-afea-2df4394d5bf4_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfInterestRatesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Types of interest rates [domain]</link:label>
    <link:label id="lab_ifrs-full_TypesOfInterestRatesDomain_label_en-US" xlink:label="lab_ifrs-full_TypesOfInterestRatesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Types of interest rates [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfInterestRatesDomain" xlink:to="lab_ifrs-full_TypesOfInterestRatesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForIncomeTaxExpense_4ed50a91-7f30-415e-83c0-9622957fbb80_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income tax (benefit) expense</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForIncomeTaxExpense_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for income tax expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForIncomeTaxExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:to="lab_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsNumberOfInstallmentPayments_cd3389d7-c0b7-4ef9-98e5-f5cce3874b33_terseLabel_en-US" xlink:label="lab_dec_BorrowingsNumberOfInstallmentPayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings, number of installment payments</link:label>
    <link:label id="lab_dec_BorrowingsNumberOfInstallmentPayments_label_en-US" xlink:label="lab_dec_BorrowingsNumberOfInstallmentPayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, number of installment payments</link:label>
    <link:label id="lab_dec_BorrowingsNumberOfInstallmentPayments_documentation_en-US" xlink:label="lab_dec_BorrowingsNumberOfInstallmentPayments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, number of installment payments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsNumberOfInstallmentPayments" xlink:href="dec-20250630.xsd#dec_BorrowingsNumberOfInstallmentPayments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsNumberOfInstallmentPayments" xlink:to="lab_dec_BorrowingsNumberOfInstallmentPayments" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CertainOtherNonCoreUndevelopedAcreageMember_f8900fe7-e377-49ad-aaab-4be37e26c5ea_terseLabel_en-US" xlink:label="lab_dec_CertainOtherNonCoreUndevelopedAcreageMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Certain other non-core undeveloped acreage</link:label>
    <link:label id="lab_dec_CertainOtherNonCoreUndevelopedAcreageMember_label_en-US" xlink:label="lab_dec_CertainOtherNonCoreUndevelopedAcreageMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Certain Other Non-Core Undeveloped Acreage [Member]</link:label>
    <link:label id="lab_dec_CertainOtherNonCoreUndevelopedAcreageMember_documentation_en-US" xlink:label="lab_dec_CertainOtherNonCoreUndevelopedAcreageMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Certain Other Non-Core Undeveloped Acreage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CertainOtherNonCoreUndevelopedAcreageMember" xlink:href="dec-20250630.xsd#dec_CertainOtherNonCoreUndevelopedAcreageMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CertainOtherNonCoreUndevelopedAcreageMember" xlink:to="lab_dec_CertainOtherNonCoreUndevelopedAcreageMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OperatingExpenseOfAssetAcquisitionSinceAcquisitionDate_378a8fcb-bebf-4163-97e8-51a1f5df7f63_terseLabel_en-US" xlink:label="lab_dec_OperatingExpenseOfAssetAcquisitionSinceAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Profit (loss) of asset acquisition since acquisition date</link:label>
    <link:label id="lab_dec_OperatingExpenseOfAssetAcquisitionSinceAcquisitionDate_label_en-US" xlink:label="lab_dec_OperatingExpenseOfAssetAcquisitionSinceAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Expense of Asset Acquisition Since Acquisition Date</link:label>
    <link:label id="lab_dec_OperatingExpenseOfAssetAcquisitionSinceAcquisitionDate_documentation_en-US" xlink:label="lab_dec_OperatingExpenseOfAssetAcquisitionSinceAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Operating Expense of Asset Acquisition Since Acquisition Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OperatingExpenseOfAssetAcquisitionSinceAcquisitionDate" xlink:href="dec-20250630.xsd#dec_OperatingExpenseOfAssetAcquisitionSinceAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OperatingExpenseOfAssetAcquisitionSinceAcquisitionDate" xlink:to="lab_dec_OperatingExpenseOfAssetAcquisitionSinceAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OldFaithfulLandLLCMember_f6c8ca4d-921a-4b51-b392-23f4f5a0dd7a_terseLabel_en-US" xlink:label="lab_dec_OldFaithfulLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Old Faithful Land LLC</link:label>
    <link:label id="lab_dec_OldFaithfulLandLLCMember_label_en-US" xlink:label="lab_dec_OldFaithfulLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Old Faithful Land LLC [Member]</link:label>
    <link:label id="lab_dec_OldFaithfulLandLLCMember_documentation_en-US" xlink:label="lab_dec_OldFaithfulLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Old Faithful Land LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OldFaithfulLandLLCMember" xlink:href="dec-20250630.xsd#dec_OldFaithfulLandLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OldFaithfulLandLLCMember" xlink:to="lab_dec_OldFaithfulLandLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory_f48d256f-aee0-4100-b940-b749ecda0f43_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Material Accounting Policies</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of material accounting policy information [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory" xlink:to="lab_ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_NumberOfReportableSegments_37ccf9f7-5ef6-41c3-98bf-2eabf3ab7242_terseLabel_en-US" xlink:label="lab_dec_NumberOfReportableSegments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of reportable segments</link:label>
    <link:label id="lab_dec_NumberOfReportableSegments_label_en-US" xlink:label="lab_dec_NumberOfReportableSegments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Reportable Segments</link:label>
    <link:label id="lab_dec_NumberOfReportableSegments_documentation_en-US" xlink:label="lab_dec_NumberOfReportableSegments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Reportable Segments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NumberOfReportableSegments" xlink:href="dec-20250630.xsd#dec_NumberOfReportableSegments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_NumberOfReportableSegments" xlink:to="lab_dec_NumberOfReportableSegments" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantProductionTrackingRate_3dcec076-4f00-448c-b911-2672c75dc7ad_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantProductionTrackingRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Production tracking rate</link:label>
    <link:label id="lab_dec_BorrowingsCovenantProductionTrackingRate_label_en-US" xlink:label="lab_dec_BorrowingsCovenantProductionTrackingRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Production Tracking Rate</link:label>
    <link:label id="lab_dec_BorrowingsCovenantProductionTrackingRate_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantProductionTrackingRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Production Tracking Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantProductionTrackingRate" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantProductionTrackingRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantProductionTrackingRate" xlink:to="lab_dec_BorrowingsCovenantProductionTrackingRate" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantMinimumAssetCoverageRatio_608d67be-01bb-4cd5-8ad7-3849ae6346b6_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantMinimumAssetCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum asset coverage ratio</link:label>
    <link:label id="lab_dec_BorrowingsCovenantMinimumAssetCoverageRatio_label_en-US" xlink:label="lab_dec_BorrowingsCovenantMinimumAssetCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Minimum Asset Coverage Ratio</link:label>
    <link:label id="lab_dec_BorrowingsCovenantMinimumAssetCoverageRatio_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantMinimumAssetCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Minimum Asset Coverage Ratio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantMinimumAssetCoverageRatio" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantMinimumAssetCoverageRatio"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantMinimumAssetCoverageRatio" xlink:to="lab_dec_BorrowingsCovenantMinimumAssetCoverageRatio" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantExcessCashFlowPaymentToBeMadeIfPerformanceMetricsAreNotMet_82e06998-e459-4524-b7e5-6fecc2c51478_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantExcessCashFlowPaymentToBeMadeIfPerformanceMetricsAreNotMet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of excess payments to be made if performance metrics are not met</link:label>
    <link:label id="lab_dec_BorrowingsCovenantExcessCashFlowPaymentToBeMadeIfPerformanceMetricsAreNotMet_label_en-US" xlink:label="lab_dec_BorrowingsCovenantExcessCashFlowPaymentToBeMadeIfPerformanceMetricsAreNotMet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Excess Cash Flow Payment To Be Made if Performance Metrics Are Not Met</link:label>
    <link:label id="lab_dec_BorrowingsCovenantExcessCashFlowPaymentToBeMadeIfPerformanceMetricsAreNotMet_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantExcessCashFlowPaymentToBeMadeIfPerformanceMetricsAreNotMet" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Excess Cash Flow Payment To Be Made if Performance Metrics Are Not Met</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantExcessCashFlowPaymentToBeMadeIfPerformanceMetricsAreNotMet" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantExcessCashFlowPaymentToBeMadeIfPerformanceMetricsAreNotMet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantExcessCashFlowPaymentToBeMadeIfPerformanceMetricsAreNotMet" xlink:to="lab_dec_BorrowingsCovenantExcessCashFlowPaymentToBeMadeIfPerformanceMetricsAreNotMet" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding_e6a050c8-cd19-453f-83a8-49f75e357593_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in number of shares outstanding (in shares)</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) in number of shares outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding" xlink:to="lab_ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_SummitNaturalResourcesMember_61686098-3b41-4e71-b5d7-a65175bf6263_terseLabel_en-US" xlink:label="lab_dec_SummitNaturalResourcesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summit Natural Resources</link:label>
    <link:label id="lab_dec_SummitNaturalResourcesMember_label_en-US" xlink:label="lab_dec_SummitNaturalResourcesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Summit Natural Resources [Member]</link:label>
    <link:label id="lab_dec_SummitNaturalResourcesMember_documentation_en-US" xlink:label="lab_dec_SummitNaturalResourcesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Summit Natural Resources</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_SummitNaturalResourcesMember" xlink:href="dec-20250630.xsd#dec_SummitNaturalResourcesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_SummitNaturalResourcesMember" xlink:to="lab_dec_SummitNaturalResourcesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OtherLiabilitiesCurrentMember_08f78453-bb08-4490-b35b-71303a767764_terseLabel_en-US" xlink:label="lab_dec_OtherLiabilitiesCurrentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current liabilities</link:label>
    <link:label id="lab_dec_OtherLiabilitiesCurrentMember_label_en-US" xlink:label="lab_dec_OtherLiabilitiesCurrentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities, Current [Member]</link:label>
    <link:label id="lab_dec_OtherLiabilitiesCurrentMember_documentation_en-US" xlink:label="lab_dec_OtherLiabilitiesCurrentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Liabilities, Current</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherLiabilitiesCurrentMember" xlink:href="dec-20250630.xsd#dec_OtherLiabilitiesCurrentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OtherLiabilitiesCurrentMember" xlink:to="lab_dec_OtherLiabilitiesCurrentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_SoldCallContractMember_49146ad5-0da0-48b6-9c92-e41bfc3457ab_terseLabel_en-US" xlink:label="lab_dec_SoldCallContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sold calls</link:label>
    <link:label id="lab_dec_SoldCallContractMember_label_en-US" xlink:label="lab_dec_SoldCallContractMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sold Call Contract [Member]</link:label>
    <link:label id="lab_dec_SoldCallContractMember_documentation_en-US" xlink:label="lab_dec_SoldCallContractMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sold Call Contract</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_SoldCallContractMember" xlink:href="dec-20250630.xsd#dec_SoldCallContractMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_SoldCallContractMember" xlink:to="lab_dec_SoldCallContractMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCentralIndexKey_114e3512-8198-48f9-88c1-16146400fb25_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:label id="lab_dei_EntityCentralIndexKey_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCentralIndexKey" xlink:to="lab_dei_EntityCentralIndexKey" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_AssetAcquisitionPropertyPlantAndEquipment_ceeee57e-5399-4d18-a93b-7140078a22af_terseLabel_en-US" xlink:label="lab_dec_AssetAcquisitionPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment</link:label>
    <link:label id="lab_dec_AssetAcquisitionPropertyPlantAndEquipment_label_en-US" xlink:label="lab_dec_AssetAcquisitionPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Property Plant and Equipment</link:label>
    <link:label id="lab_dec_AssetAcquisitionPropertyPlantAndEquipment_documentation_en-US" xlink:label="lab_dec_AssetAcquisitionPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Property Plant and Equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetAcquisitionPropertyPlantAndEquipment" xlink:href="dec-20250630.xsd#dec_AssetAcquisitionPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AssetAcquisitionPropertyPlantAndEquipment" xlink:to="lab_dec_AssetAcquisitionPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MergerReserveMember_055562f0-a864-4058-b1bf-68b9c6ee1514_terseLabel_en-US" xlink:label="lab_ifrs-full_MergerReserveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Merger Reserve</link:label>
    <link:label id="lab_ifrs-full_MergerReserveMember_label_en-US" xlink:label="lab_ifrs-full_MergerReserveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Merger reserve [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MergerReserveMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MergerReserveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MergerReserveMember" xlink:to="lab_ifrs-full_MergerReserveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DerivativeFinancialLiabilities_5abdeb63-c96c-456b-8ab9-e17bb33a7cfe_negatedNetLabel_en-US" xlink:label="lab_ifrs-full_DerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:type="resource" xml:lang="en-US">Fair value, liabilities</link:label>
    <link:label id="lab_ifrs-full_DerivativeFinancialLiabilities_12fd4025-33e5-4e13-845d-ce11f1402a46_negatedTotalLabel_en-US" xlink:label="lab_ifrs-full_DerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Total liabilities</link:label>
    <link:label id="lab_ifrs-full_DerivativeFinancialLiabilities_label_en-US" xlink:label="lab_ifrs-full_DerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative financial liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativeFinancialLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DerivativeFinancialLiabilities" xlink:to="lab_ifrs-full_DerivativeFinancialLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearFiveMember_a4515991-9172-40ae-8835-8a979ce35d20_terseLabel_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearFiveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2030</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearFiveMember_label_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearFiveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Five [Member]</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearFiveMember_documentation_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearFiveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeInstrumentPeriodYearFiveMember" xlink:href="dec-20250630.xsd#dec_DerivativeInstrumentPeriodYearFiveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeInstrumentPeriodYearFiveMember" xlink:to="lab_dec_DerivativeInstrumentPeriodYearFiveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract_a13886e9-ad7e-4e4b-982b-23c8083df089_terseLabel_en-US" xlink:label="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consideration paid</link:label>
    <link:label id="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract_label_en-US" xlink:label="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Acquisition-date fair value of total consideration transferred [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets_dc9a53ed-2a9c-4840-89f4-70bb4731eecd_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in other non-current assets</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for decrease (increase) in other assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:to="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentTradeReceivables_6e0304b4-dcd4-4e98-b151-1340f1acac6d_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentTradeReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade receivables, net</link:label>
    <link:label id="lab_ifrs-full_CurrentTradeReceivables_label_en-US" xlink:label="lab_ifrs-full_CurrentTradeReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current trade receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTradeReceivables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentTradeReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentTradeReceivables" xlink:to="lab_ifrs-full_CurrentTradeReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_LOEMember_3ad76caa-d4cf-43db-bb48-214963510d1d_terseLabel_en-US" xlink:label="lab_dec_LOEMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LOE</link:label>
    <link:label id="lab_dec_LOEMember_label_en-US" xlink:label="lab_dec_LOEMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">LOE [Member]</link:label>
    <link:label id="lab_dec_LOEMember_documentation_en-US" xlink:label="lab_dec_LOEMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">LOE</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_LOEMember" xlink:href="dec-20250630.xsd#dec_LOEMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_LOEMember" xlink:to="lab_dec_LOEMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossOfCombinedEntity_68cebd79-0b6c-48c4-b348-54ecbe60202c_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossOfCombinedEntity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Profit (loss) of combined entity as if combination occurred at beginning of period</link:label>
    <link:label id="lab_ifrs-full_ProfitLossOfCombinedEntity_label_en-US" xlink:label="lab_ifrs-full_ProfitLossOfCombinedEntity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit (loss) of combined entity as if combination occurred at beginning of period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossOfCombinedEntity" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossOfCombinedEntity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossOfCombinedEntity" xlink:to="lab_ifrs-full_ProfitLossOfCombinedEntity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayables_76e16f4a-a193-45fe-93d0-c4bc2ac11df6_terseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade and other payables</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayables_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade and other current payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentPayables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeAndOtherCurrentPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherCurrentPayables" xlink:to="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAndLiabilitiesAbstract_507de547-efee-44ab-8eb8-c7393667f10a_terseLabel_en-US" xlink:label="lab_ifrs-full_EquityAndLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EQUITY AND LIABILITIES</link:label>
    <link:label id="lab_ifrs-full_EquityAndLiabilitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_EquityAndLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity and liabilities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAndLiabilitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAndLiabilitiesAbstract" xlink:to="lab_ifrs-full_EquityAndLiabilitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ApplicableTaxRate_1ebe8e85-f48e-4e34-854e-df4dedf7aadd_terseLabel_en-US" xlink:label="lab_ifrs-full_ApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected tax at statutory U.S. federal income tax rate</link:label>
    <link:label id="lab_ifrs-full_ApplicableTaxRate_label_en-US" xlink:label="lab_ifrs-full_ApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Applicable tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ApplicableTaxRate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ApplicableTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ApplicableTaxRate" xlink:to="lab_ifrs-full_ApplicableTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities_2b0ddcbb-79dd-4ca8-8b88-0ea07af3d5cf_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in other non-current liabilities</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for increase (decrease) in other liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:to="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForFinanceCosts_67411282-c0c5-4995-a6dc-fbfb7b8fc795_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance costs</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForFinanceCosts_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for finance costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForFinanceCosts" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForFinanceCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForFinanceCosts" xlink:to="lab_ifrs-full_AdjustmentsForFinanceCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeLiabilityAbstract_5d8dd1fe-d5b8-4e27-9d6f-69cd54cfaafb_terseLabel_en-US" xlink:label="lab_dec_DerivativeLiabilityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liabilities:</link:label>
    <link:label id="lab_dec_DerivativeLiabilityAbstract_label_en-US" xlink:label="lab_dec_DerivativeLiabilityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability [Abstract]</link:label>
    <link:label id="lab_dec_DerivativeLiabilityAbstract_documentation_en-US" xlink:label="lab_dec_DerivativeLiabilityAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeLiabilityAbstract" xlink:href="dec-20250630.xsd#dec_DerivativeLiabilityAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeLiabilityAbstract" xlink:to="lab_dec_DerivativeLiabilityAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromIssuingShares_e0893266-64de-4fad-827e-e6165cfda767_verboseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromIssuingShares" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from equity issuance, net</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromIssuingShares_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromIssuingShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from issuing shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromIssuingShares" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromIssuingShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromIssuingShares" xlink:to="lab_ifrs-full_ProceedsFromIssuingShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NotLaterThanOneYearMember_c92d14ea-4c36-46b2-8ba0-822852a19881_terseLabel_en-US" xlink:label="lab_ifrs-full_NotLaterThanOneYearMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Not later than one year</link:label>
    <link:label id="lab_ifrs-full_NotLaterThanOneYearMember_label_en-US" xlink:label="lab_ifrs-full_NotLaterThanOneYearMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Not later than one year [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotLaterThanOneYearMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NotLaterThanOneYearMember" xlink:to="lab_ifrs-full_NotLaterThanOneYearMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DisclosureOfDecommissioningRestorationAndRehabilitationProvisionsExplanatoryTextBlock_ad950f2f-0331-4dc4-aea4-fe3d725c0757_terseLabel_en-US" xlink:label="lab_dec_DisclosureOfDecommissioningRestorationAndRehabilitationProvisionsExplanatoryTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligations</link:label>
    <link:label id="lab_dec_DisclosureOfDecommissioningRestorationAndRehabilitationProvisionsExplanatoryTextBlock_label_en-US" xlink:label="lab_dec_DisclosureOfDecommissioningRestorationAndRehabilitationProvisionsExplanatoryTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Decommissioning, Restoration And Rehabilitation Provisions Explanatory [Text Block]</link:label>
    <link:label id="lab_dec_DisclosureOfDecommissioningRestorationAndRehabilitationProvisionsExplanatoryTextBlock_documentation_en-US" xlink:label="lab_dec_DisclosureOfDecommissioningRestorationAndRehabilitationProvisionsExplanatoryTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure Of Decommissioning, Restoration And Rehabilitation Provisions Explanatory</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DisclosureOfDecommissioningRestorationAndRehabilitationProvisionsExplanatoryTextBlock" xlink:href="dec-20250630.xsd#dec_DisclosureOfDecommissioningRestorationAndRehabilitationProvisionsExplanatoryTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DisclosureOfDecommissioningRestorationAndRehabilitationProvisionsExplanatoryTextBlock" xlink:to="lab_dec_DisclosureOfDecommissioningRestorationAndRehabilitationProvisionsExplanatoryTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentTaxLiabilities_f04acebb-b297-4f7f-8c1f-907c06fd3734_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Taxes payable</link:label>
    <link:label id="lab_ifrs-full_CurrentTaxLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current tax liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentTaxLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentTaxLiabilities" xlink:to="lab_ifrs-full_CurrentTaxLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_SecuredOvernightFinancingRateSOFRMember_a1e01905-707b-48ae-ae3b-e887a5321276_terseLabel_en-US" xlink:label="lab_dec_SecuredOvernightFinancingRateSOFRMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">SOFR</link:label>
    <link:label id="lab_dec_SecuredOvernightFinancingRateSOFRMember_label_en-US" xlink:label="lab_dec_SecuredOvernightFinancingRateSOFRMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Secured Overnight Financing Rate (SOFR) [Member]</link:label>
    <link:label id="lab_dec_SecuredOvernightFinancingRateSOFRMember_documentation_en-US" xlink:label="lab_dec_SecuredOvernightFinancingRateSOFRMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Secured Overnight Financing Rate (SOFR)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_SecuredOvernightFinancingRateSOFRMember" xlink:href="dec-20250630.xsd#dec_SecuredOvernightFinancingRateSOFRMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_SecuredOvernightFinancingRateSOFRMember" xlink:to="lab_dec_SecuredOvernightFinancingRateSOFRMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CurrentDerivativeAssetBeforeOffset_ff77f9c8-2923-4be1-8930-e28a1093ce3c_terseLabel_en-US" xlink:label="lab_dec_CurrentDerivativeAssetBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current assets</link:label>
    <link:label id="lab_dec_CurrentDerivativeAssetBeforeOffset_label_en-US" xlink:label="lab_dec_CurrentDerivativeAssetBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Derivative Asset, Before Offset</link:label>
    <link:label id="lab_dec_CurrentDerivativeAssetBeforeOffset_documentation_en-US" xlink:label="lab_dec_CurrentDerivativeAssetBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Current Derivative Asset, Before Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CurrentDerivativeAssetBeforeOffset" xlink:href="dec-20250630.xsd#dec_CurrentDerivativeAssetBeforeOffset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CurrentDerivativeAssetBeforeOffset" xlink:to="lab_dec_CurrentDerivativeAssetBeforeOffset" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossFromOperatingActivities_88df6996-86a6-42bb-9861-02f9ed00d751_totalLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Operating profit (loss)</link:label>
    <link:label id="lab_ifrs-full_ProfitLossFromOperatingActivities_label_en-US" xlink:label="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit (loss) from operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossFromOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossFromOperatingActivities" xlink:to="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_NoncurrentDerivativeLiabilityAssetOffset_6e16af5b-38dd-4b27-982d-b6fb8e2e1d5c_terseLabel_en-US" xlink:label="lab_dec_NoncurrentDerivativeLiabilityAssetOffset" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-current liabilities</link:label>
    <link:label id="lab_dec_NoncurrentDerivativeLiabilityAssetOffset_label_en-US" xlink:label="lab_dec_NoncurrentDerivativeLiabilityAssetOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncurrent Derivative Liability, Asset Offset</link:label>
    <link:label id="lab_dec_NoncurrentDerivativeLiabilityAssetOffset_documentation_en-US" xlink:label="lab_dec_NoncurrentDerivativeLiabilityAssetOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Noncurrent Derivative Liability, Asset Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NoncurrentDerivativeLiabilityAssetOffset" xlink:href="dec-20250630.xsd#dec_NoncurrentDerivativeLiabilityAssetOffset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_NoncurrentDerivativeLiabilityAssetOffset" xlink:to="lab_dec_NoncurrentDerivativeLiabilityAssetOffset" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LongtermBorrowings_681ba83c-43c9-4035-bacf-251ec90cce1a_verboseLabel_en-US" xlink:label="lab_ifrs-full_LongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_ifrs-full_LongtermBorrowings_eaf6a572-abfc-49b5-82f0-1e2e55a7fdc0_terseLabel_en-US" xlink:label="lab_ifrs-full_LongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total non-current borrowings, net</link:label>
    <link:label id="lab_ifrs-full_LongtermBorrowings_label_en-US" xlink:label="lab_ifrs-full_LongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current portion of non-current borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowings" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LongtermBorrowings" xlink:to="lab_ifrs-full_LongtermBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentToMidmarketConsensusPriceMeasurementInputMember_b4d8a68e-96d4-41f1-adc7-76a327daaabf_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentToMidmarketConsensusPriceMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pricing</link:label>
    <link:label id="lab_ifrs-full_AdjustmentToMidmarketConsensusPriceMeasurementInputMember_label_en-US" xlink:label="lab_ifrs-full_AdjustmentToMidmarketConsensusPriceMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustment to mid-market consensus price, measurement input [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentToMidmarketConsensusPriceMeasurementInputMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentToMidmarketConsensusPriceMeasurementInputMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentToMidmarketConsensusPriceMeasurementInputMember" xlink:to="lab_ifrs-full_AdjustmentToMidmarketConsensusPriceMeasurementInputMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressAddressLine1_2fdbf68b-7d66-4e0a-96e4-4954027935d2_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:label id="lab_dei_EntityAddressAddressLine1_label_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressAddressLine1" xlink:to="lab_dei_EntityAddressAddressLine1" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashTransferred_9cc60ab4-a37a-4e9f-852a-c5035b600320_terseLabel_en-US" xlink:label="lab_ifrs-full_CashTransferred" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash consideration</link:label>
    <link:label id="lab_ifrs-full_CashTransferred_label_en-US" xlink:label="lab_ifrs-full_CashTransferred" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash transferred</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashTransferred" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashTransferred"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashTransferred" xlink:to="lab_ifrs-full_CashTransferred" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NetDeferredTaxLiabilities_cba8aefb-ff18-4cac-97d5-77671fbc6e31_terseLabel_en-US" xlink:label="lab_ifrs-full_NetDeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred tax liability</link:label>
    <link:label id="lab_ifrs-full_NetDeferredTaxLiabilities_label_en-US" xlink:label="lab_ifrs-full_NetDeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net deferred tax liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetDeferredTaxLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NetDeferredTaxLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NetDeferredTaxLiabilities" xlink:to="lab_ifrs-full_NetDeferredTaxLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LiabilitiesIncurred_67e7af85-bf8d-4d33-9541-5961c1f4c2c8_terseLabel_en-US" xlink:label="lab_ifrs-full_LiabilitiesIncurred" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assumption of outstanding debt</link:label>
    <link:label id="lab_ifrs-full_LiabilitiesIncurred_label_en-US" xlink:label="lab_ifrs-full_LiabilitiesIncurred" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities incurred</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LiabilitiesIncurred" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesIncurred"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LiabilitiesIncurred" xlink:to="lab_ifrs-full_LiabilitiesIncurred" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DeferredConsiderationPaymentsClassifiedAsInvestingActivities_7f3f1537-ff68-4761-a5c1-3976e97c1f6d_negatedTerseLabel_en-US" xlink:label="lab_dec_DeferredConsiderationPaymentsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Deferred consideration payments</link:label>
    <link:label id="lab_dec_DeferredConsiderationPaymentsClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_dec_DeferredConsiderationPaymentsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Consideration Payments, Classified As Investing Activities</link:label>
    <link:label id="lab_dec_DeferredConsiderationPaymentsClassifiedAsInvestingActivities_documentation_en-US" xlink:label="lab_dec_DeferredConsiderationPaymentsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Deferred Consideration Payments, Classified As Investing Activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DeferredConsiderationPaymentsClassifiedAsInvestingActivities" xlink:href="dec-20250630.xsd#dec_DeferredConsiderationPaymentsClassifiedAsInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DeferredConsiderationPaymentsClassifiedAsInvestingActivities" xlink:to="lab_dec_DeferredConsiderationPaymentsClassifiedAsInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory_d7348dfd-fde1-4678-b331-4a5eb5027a58_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for property, plant and equipment [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OaktreeSellersNotesMember_206a0c29-c0d5-409f-bc1c-8e8b4d8d4bf1_terseLabel_en-US" xlink:label="lab_dec_OaktreeSellersNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oaktree Sellers Notes</link:label>
    <link:label id="lab_dec_OaktreeSellersNotesMember_label_en-US" xlink:label="lab_dec_OaktreeSellersNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oaktree Sellers Notes [Member]</link:label>
    <link:label id="lab_dec_OaktreeSellersNotesMember_documentation_en-US" xlink:label="lab_dec_OaktreeSellersNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Oaktree Sellers Notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OaktreeSellersNotesMember" xlink:href="dec-20250630.xsd#dec_OaktreeSellersNotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OaktreeSellersNotesMember" xlink:to="lab_dec_OaktreeSellersNotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_e5eb991f-8822-4cba-a156-d3d8588761c4_terseLabel_en-US" xlink:label="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase consideration</link:label>
    <link:label id="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_214102cd-f748-47bf-9898-b9ba241f5b42_totalLabel_en-US" xlink:label="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total consideration</link:label>
    <link:label id="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_label_en-US" xlink:label="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consideration transferred, acquisition-date fair value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:to="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_6ff95a8c-96eb-4f0c-b5a3-1443f87dda21_verboseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from borrowings</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_7e37152f-d84c-4731-a5cb-d004bd212e24_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from borrowings</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from borrowings, classified as financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities"/>
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    <link:label id="lab_dec_FinancialInstrumentsMember_5a1a536f-2899-44fd-93c2-a2b68862d85a_terseLabel_en-US" xlink:label="lab_dec_FinancialInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial Instruments</link:label>
    <link:label id="lab_dec_FinancialInstrumentsMember_label_en-US" xlink:label="lab_dec_FinancialInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial Instruments [Member]</link:label>
    <link:label id="lab_dec_FinancialInstrumentsMember_documentation_en-US" xlink:label="lab_dec_FinancialInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financial Instruments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_FinancialInstrumentsMember" xlink:href="dec-20250630.xsd#dec_FinancialInstrumentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_FinancialInstrumentsMember" xlink:to="lab_dec_FinancialInstrumentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DescriptionOfAccountingPolicyForGoingConcernPolicyTextBlock_a6ba0f65-9ff2-4eac-b3d1-c94e877659a6_terseLabel_en-US" xlink:label="lab_dec_DescriptionOfAccountingPolicyForGoingConcernPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Going Concern</link:label>
    <link:label id="lab_dec_DescriptionOfAccountingPolicyForGoingConcernPolicyTextBlock_label_en-US" xlink:label="lab_dec_DescriptionOfAccountingPolicyForGoingConcernPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of Accounting Policy For Going Concern [Policy Text Block]</link:label>
    <link:label id="lab_dec_DescriptionOfAccountingPolicyForGoingConcernPolicyTextBlock_documentation_en-US" xlink:label="lab_dec_DescriptionOfAccountingPolicyForGoingConcernPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Description of Accounting Policy For Going Concern</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DescriptionOfAccountingPolicyForGoingConcernPolicyTextBlock" xlink:href="dec-20250630.xsd#dec_DescriptionOfAccountingPolicyForGoingConcernPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DescriptionOfAccountingPolicyForGoingConcernPolicyTextBlock" xlink:to="lab_dec_DescriptionOfAccountingPolicyForGoingConcernPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_b8f69d28-e866-4b57-a349-1b8450157218_negatedLabel_en-US" xlink:label="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Principal element of lease payments</link:label>
    <link:label id="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments of lease liabilities, classified as financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:to="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_162fc898-2ec0-4c47-a014-61a44c4dcda8_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Allowance for expected credit losses</link:label>
    <link:label id="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_9569e43b-0556-4b55-b01a-b0629293e43f_terseLabel_en-US" xlink:label="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Allowance for expected credit losses</link:label>
    <link:label id="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_label_en-US" xlink:label="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impairment loss recognised in profit or loss</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss" xlink:to="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_AssetAcquisitionRetirementObligationsLiabilityPortion_85ad48fd-f37f-4937-9489-5dbeecf283b8_negatedTerseLabel_en-US" xlink:label="lab_dec_AssetAcquisitionRetirementObligationsLiabilityPortion" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Asset retirement obligations, liability portion</link:label>
    <link:label id="lab_dec_AssetAcquisitionRetirementObligationsLiabilityPortion_label_en-US" xlink:label="lab_dec_AssetAcquisitionRetirementObligationsLiabilityPortion" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Retirement Obligations, Liability Portion</link:label>
    <link:label id="lab_dec_AssetAcquisitionRetirementObligationsLiabilityPortion_documentation_en-US" xlink:label="lab_dec_AssetAcquisitionRetirementObligationsLiabilityPortion" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Retirement Obligations, Liability Portion</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetAcquisitionRetirementObligationsLiabilityPortion" xlink:href="dec-20250630.xsd#dec_AssetAcquisitionRetirementObligationsLiabilityPortion"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AssetAcquisitionRetirementObligationsLiabilityPortion" xlink:to="lab_dec_AssetAcquisitionRetirementObligationsLiabilityPortion" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ChesapeakeGraniteWashTrustMember_7e7f2208-49d5-456d-b600-a58e78059898_terseLabel_en-US" xlink:label="lab_dec_ChesapeakeGraniteWashTrustMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Chesapeake Granite Wash Trust</link:label>
    <link:label id="lab_dec_ChesapeakeGraniteWashTrustMember_label_en-US" xlink:label="lab_dec_ChesapeakeGraniteWashTrustMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Chesapeake Granite Wash Trust [Member]</link:label>
    <link:label id="lab_dec_ChesapeakeGraniteWashTrustMember_documentation_en-US" xlink:label="lab_dec_ChesapeakeGraniteWashTrustMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Chesapeake Granite Wash Trust</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ChesapeakeGraniteWashTrustMember" xlink:href="dec-20250630.xsd#dec_ChesapeakeGraniteWashTrustMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ChesapeakeGraniteWashTrustMember" xlink:to="lab_dec_ChesapeakeGraniteWashTrustMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_99fee594-1db9-4b10-80ff-a5b8649640c2_terseLabel_en-US" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proportion of ownership interest in subsidiary (as a percent)</link:label>
    <link:label id="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_label_en-US" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proportion of ownership interest in subsidiary</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:to="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_f3e49ab9-9674-45be-8ef3-c44ebf635d01_terseLabel_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Name of Property [Domain]</link:label>
    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_label_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Name of Property [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="lab_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ThirdPartyPluggingRevenueMember_c5727d03-c08b-45c1-8d4b-fc78911fbdf8_terseLabel_en-US" xlink:label="lab_dec_ThirdPartyPluggingRevenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Third-party plugging revenue</link:label>
    <link:label id="lab_dec_ThirdPartyPluggingRevenueMember_label_en-US" xlink:label="lab_dec_ThirdPartyPluggingRevenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Third Party Plugging Revenue [Member]</link:label>
    <link:label id="lab_dec_ThirdPartyPluggingRevenueMember_documentation_en-US" xlink:label="lab_dec_ThirdPartyPluggingRevenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Third Party Plugging Revenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ThirdPartyPluggingRevenueMember" xlink:href="dec-20250630.xsd#dec_ThirdPartyPluggingRevenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ThirdPartyPluggingRevenueMember" xlink:to="lab_dec_ThirdPartyPluggingRevenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityRegistrantName_4d39620c-32ee-48b6-b54c-35c957b4a15a_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:label id="lab_dei_EntityRegistrantName_label_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
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    <link:label id="lab_dec_CovenantFourMember_428b27c3-4fa9-4848-ac0a-a865a6ab7786_terseLabel_en-US" xlink:label="lab_dec_CovenantFourMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Covenant Four</link:label>
    <link:label id="lab_dec_CovenantFourMember_label_en-US" xlink:label="lab_dec_CovenantFourMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Covenant Four [Member]</link:label>
    <link:label id="lab_dec_CovenantFourMember_documentation_en-US" xlink:label="lab_dec_CovenantFourMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Covenant Four</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CovenantFourMember" xlink:href="dec-20250630.xsd#dec_CovenantFourMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CovenantFourMember" xlink:to="lab_dec_CovenantFourMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BasicEarningsLossPerShare_a1cfec19-001b-45b9-941c-5d52bc3a1e07_terseLabel_en-US" xlink:label="lab_ifrs-full_BasicEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings (loss) per share - basic (in dollar per share)</link:label>
    <link:label id="lab_ifrs-full_BasicEarningsLossPerShare_label_en-US" xlink:label="lab_ifrs-full_BasicEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basic earnings (loss) per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BasicEarningsLossPerShare" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BasicEarningsLossPerShare"/>
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    <link:label id="lab_dec_UpstreamProducingAppalachianAssetsMember_7290b25f-d30c-4fd6-90fe-4d453eb5fa64_terseLabel_en-US" xlink:label="lab_dec_UpstreamProducingAppalachianAssetsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Upstream producing Appalachian assets</link:label>
    <link:label id="lab_dec_UpstreamProducingAppalachianAssetsMember_label_en-US" xlink:label="lab_dec_UpstreamProducingAppalachianAssetsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Upstream Producing Appalachian Assets [Member]</link:label>
    <link:label id="lab_dec_UpstreamProducingAppalachianAssetsMember_documentation_en-US" xlink:label="lab_dec_UpstreamProducingAppalachianAssetsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Upstream Producing Appalachian Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_UpstreamProducingAppalachianAssetsMember" xlink:href="dec-20250630.xsd#dec_UpstreamProducingAppalachianAssetsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_UpstreamProducingAppalachianAssetsMember" xlink:to="lab_dec_UpstreamProducingAppalachianAssetsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_MaverickCreditFacilityMember_988cfb4c-51d2-4aa9-a4b9-ad17683dfb9e_terseLabel_en-US" xlink:label="lab_dec_MaverickCreditFacilityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maverick Credit Facility</link:label>
    <link:label id="lab_dec_MaverickCreditFacilityMember_label_en-US" xlink:label="lab_dec_MaverickCreditFacilityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maverick Credit Facility [Member]</link:label>
    <link:label id="lab_dec_MaverickCreditFacilityMember_documentation_en-US" xlink:label="lab_dec_MaverickCreditFacilityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maverick Credit Facility</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_MaverickCreditFacilityMember" xlink:href="dec-20250630.xsd#dec_MaverickCreditFacilityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_MaverickCreditFacilityMember" xlink:to="lab_dec_MaverickCreditFacilityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MeasurementAxis_d8bfdca0-2d8e-45dc-8fcc-81e19ced7183_terseLabel_en-US" xlink:label="lab_ifrs-full_MeasurementAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement [axis]</link:label>
    <link:label id="lab_ifrs-full_MeasurementAxis_label_en-US" xlink:label="lab_ifrs-full_MeasurementAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MeasurementAxis" xlink:to="lab_ifrs-full_MeasurementAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeAssetBeforeOffset_977e88ce-586b-40f5-a39c-f83174719022_totalLabel_en-US" xlink:label="lab_dec_DerivativeAssetBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:label id="lab_dec_DerivativeAssetBeforeOffset_label_en-US" xlink:label="lab_dec_DerivativeAssetBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Before Offset</link:label>
    <link:label id="lab_dec_DerivativeAssetBeforeOffset_documentation_en-US" xlink:label="lab_dec_DerivativeAssetBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Asset, Before Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeAssetBeforeOffset" xlink:href="dec-20250630.xsd#dec_DerivativeAssetBeforeOffset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeAssetBeforeOffset" xlink:to="lab_dec_DerivativeAssetBeforeOffset" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities_f66de24d-28b6-49ad-93b8-b3dab4abc69d_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Distributions to non-controlling interest owners</link:label>
    <link:label id="lab_ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends paid to non-controlling interests, classified as financing activities</link:label>
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    <link:label id="lab_ifrs-full_StatementOfCashFlowsAbstract_label_en-US" xlink:label="lab_ifrs-full_StatementOfCashFlowsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of cash flows [abstract]</link:label>
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    <link:label id="lab_dec_EventsAfterReportingPeriodAbstract_label_en-US" xlink:label="lab_dec_EventsAfterReportingPeriodAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Events After Reporting Period [Abstract]</link:label>
    <link:label id="lab_dec_EventsAfterReportingPeriodAbstract_documentation_en-US" xlink:label="lab_dec_EventsAfterReportingPeriodAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Events After Reporting Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_EventsAfterReportingPeriodAbstract" xlink:href="dec-20250630.xsd#dec_EventsAfterReportingPeriodAbstract"/>
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    <link:label id="lab_ifrs-full_AdjustedWeightedAverageShares_7f709fdc-2403-4c04-ba47-89c0d608f1a8_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustedWeightedAverageShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average shares outstanding - diluted (in shares)</link:label>
    <link:label id="lab_ifrs-full_AdjustedWeightedAverageShares_label_en-US" xlink:label="lab_ifrs-full_AdjustedWeightedAverageShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted average number of ordinary shares used in calculating diluted earnings per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustedWeightedAverageShares" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustedWeightedAverageShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustedWeightedAverageShares" xlink:to="lab_ifrs-full_AdjustedWeightedAverageShares" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OilContractsMember_d8fffc55-64c1-4261-b1c9-a9055cf17add_terseLabel_en-US" xlink:label="lab_dec_OilContractsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oil Contracts</link:label>
    <link:label id="lab_dec_OilContractsMember_label_en-US" xlink:label="lab_dec_OilContractsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil Contracts [Member]</link:label>
    <link:label id="lab_dec_OilContractsMember_documentation_en-US" xlink:label="lab_dec_OilContractsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Oil Contracts</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OilContractsMember" xlink:href="dec-20250630.xsd#dec_OilContractsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OilContractsMember" xlink:to="lab_dec_OilContractsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DisclosureOfExpensesByNatureTableTextBlock_aa97615a-312f-4547-af11-d919b3d68407_terseLabel_en-US" xlink:label="lab_dec_DisclosureOfExpensesByNatureTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of details of the Group's expenses</link:label>
    <link:label id="lab_dec_DisclosureOfExpensesByNatureTableTextBlock_label_en-US" xlink:label="lab_dec_DisclosureOfExpensesByNatureTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Expenses By Nature [Table Text Block]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_DisclosureOfExpensesByNatureTableTextBlock" xlink:href="dec-20250630.xsd#dec_DisclosureOfExpensesByNatureTableTextBlock"/>
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    <link:label id="lab_dec_DiversifiedProductionLLCMember_7370c052-3409-47a0-b7ee-631bda47c73e_terseLabel_en-US" xlink:label="lab_dec_DiversifiedProductionLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Diversified Production LLC</link:label>
    <link:label id="lab_dec_DiversifiedProductionLLCMember_label_en-US" xlink:label="lab_dec_DiversifiedProductionLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Diversified Production LLC [Member]</link:label>
    <link:label id="lab_dec_DiversifiedProductionLLCMember_documentation_en-US" xlink:label="lab_dec_DiversifiedProductionLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Diversified Production LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DiversifiedProductionLLCMember" xlink:href="dec-20250630.xsd#dec_DiversifiedProductionLLCMember"/>
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    <link:label id="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformanceMultiplier_4ed4e527-f7ea-48a0-8ea9-50d5391634fd_terseLabel_en-US" xlink:label="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformanceMultiplier" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sustainability-linked performance targets, TRIR Performance, multiplier</link:label>
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    <link:label id="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformanceMultiplier_documentation_en-US" xlink:label="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformanceMultiplier" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Sustainability-Linked Performance Targets, TRIR Performance, Multiplier</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformanceMultiplier" xlink:href="dec-20250630.xsd#dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformanceMultiplier"/>
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    <link:label id="lab_dec_PrincipalInstallmentDueDateAxis_68d81002-ec2d-4db2-95ff-4a068e4f5d2e_terseLabel_en-US" xlink:label="lab_dec_PrincipalInstallmentDueDateAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Principal Installment Due Date [Axis]</link:label>
    <link:label id="lab_dec_PrincipalInstallmentDueDateAxis_label_en-US" xlink:label="lab_dec_PrincipalInstallmentDueDateAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Principal Installment Due Date [Axis]</link:label>
    <link:label id="lab_dec_PrincipalInstallmentDueDateAxis_documentation_en-US" xlink:label="lab_dec_PrincipalInstallmentDueDateAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Principal Installment Due Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_PrincipalInstallmentDueDateAxis" xlink:href="dec-20250630.xsd#dec_PrincipalInstallmentDueDateAxis"/>
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    <link:label id="lab_dec_NumberOfTreasurySharesPurchasedDuringThePeriod_04ced7f3-5963-433e-ae53-bca2ff7a3524_terseLabel_en-US" xlink:label="lab_dec_NumberOfTreasurySharesPurchasedDuringThePeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares purchased (in shares)</link:label>
    <link:label id="lab_dec_NumberOfTreasurySharesPurchasedDuringThePeriod_label_en-US" xlink:label="lab_dec_NumberOfTreasurySharesPurchasedDuringThePeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Treasury Shares Purchased During The Period</link:label>
    <link:label id="lab_dec_NumberOfTreasurySharesPurchasedDuringThePeriod_documentation_en-US" xlink:label="lab_dec_NumberOfTreasurySharesPurchasedDuringThePeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Treasury Shares Purchased During The Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NumberOfTreasurySharesPurchasedDuringThePeriod" xlink:href="dec-20250630.xsd#dec_NumberOfTreasurySharesPurchasedDuringThePeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_NumberOfTreasurySharesPurchasedDuringThePeriod" xlink:to="lab_dec_NumberOfTreasurySharesPurchasedDuringThePeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleIncreaseInUnobservableInputAssets_a1d0c708-28a2-4f30-af09-dadaa303e58b_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleIncreaseInUnobservableInputAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in Adjusted fair value of natural gas and oil properties due to reasonably possible 10% increase in measurement input</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputAssets" xlink:to="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForSharebasedPayments_2442b239-6ead-4430-be9f-71dee842051b_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForSharebasedPayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-cash equity compensation</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForSharebasedPayments_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForSharebasedPayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for share-based payments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForSharebasedPayments" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForSharebasedPayments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForSharebasedPayments" xlink:to="lab_ifrs-full_AdjustmentsForSharebasedPayments" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_MaverickNaturalResourcesLLCMember_19627134-6205-48c5-89a5-1d08640a5bb5_terseLabel_en-US" xlink:label="lab_dec_MaverickNaturalResourcesLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maverick Natural Resources, LLC</link:label>
    <link:label id="lab_dec_MaverickNaturalResourcesLLCMember_label_en-US" xlink:label="lab_dec_MaverickNaturalResourcesLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maverick Natural Resources, LLC [Member]</link:label>
    <link:label id="lab_dec_MaverickNaturalResourcesLLCMember_documentation_en-US" xlink:label="lab_dec_MaverickNaturalResourcesLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maverick Natural Resources, LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_MaverickNaturalResourcesLLCMember" xlink:href="dec-20250630.xsd#dec_MaverickNaturalResourcesLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_MaverickNaturalResourcesLLCMember" xlink:to="lab_dec_MaverickNaturalResourcesLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CurrentFederalTaxExpenseIncome_2de051c0-9e24-4a7d-a0f0-d6b2c1ed7483_terseLabel_en-US" xlink:label="lab_dec_CurrentFederalTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Federal (benefit) expense</link:label>
    <link:label id="lab_dec_CurrentFederalTaxExpenseIncome_label_en-US" xlink:label="lab_dec_CurrentFederalTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Federal Tax Expense (Income)</link:label>
    <link:label id="lab_dec_CurrentFederalTaxExpenseIncome_documentation_en-US" xlink:label="lab_dec_CurrentFederalTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Current Federal Tax Expense (Income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CurrentFederalTaxExpenseIncome" xlink:href="dec-20250630.xsd#dec_CurrentFederalTaxExpenseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CurrentFederalTaxExpenseIncome" xlink:to="lab_dec_CurrentFederalTaxExpenseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_NaturalGasLiquidsNGLMember_f3320030-f96c-402e-bf34-30adb22ea237_terseLabel_en-US" xlink:label="lab_dec_NaturalGasLiquidsNGLMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">NGLs</link:label>
    <link:label id="lab_dec_NaturalGasLiquidsNGLMember_label_en-US" xlink:label="lab_dec_NaturalGasLiquidsNGLMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Natural Gas Liquids (NGL) [Member]</link:label>
    <link:label id="lab_dec_NaturalGasLiquidsNGLMember_documentation_en-US" xlink:label="lab_dec_NaturalGasLiquidsNGLMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Natural Gas Liquids (NGL)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NaturalGasLiquidsNGLMember" xlink:href="dec-20250630.xsd#dec_NaturalGasLiquidsNGLMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_NaturalGasLiquidsNGLMember" xlink:to="lab_dec_NaturalGasLiquidsNGLMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentRestrictedCashAndCashEquivalents_f2030be1-e952-4e69-8a38-04fdb192088a_verboseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentRestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Restricted cash</link:label>
    <link:label id="lab_ifrs-full_NoncurrentRestrictedCashAndCashEquivalents_c88d0746-a66d-4738-b216-baa3d6a4a050_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentRestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-current asset</link:label>
    <link:label id="lab_ifrs-full_NoncurrentRestrictedCashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_NoncurrentRestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current restricted cash and cash equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentRestrictedCashAndCashEquivalents" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentRestrictedCashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentRestrictedCashAndCashEquivalents" xlink:to="lab_ifrs-full_NoncurrentRestrictedCashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ForwardCurveMeasurementInputMember_fcb07a5f-0ac3-407a-8f39-2f682c11a0d7_terseLabel_en-US" xlink:label="lab_dec_ForwardCurveMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forward curve</link:label>
    <link:label id="lab_dec_ForwardCurveMeasurementInputMember_label_en-US" xlink:label="lab_dec_ForwardCurveMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Forward Curve, Measurement Input [Member]</link:label>
    <link:label id="lab_dec_ForwardCurveMeasurementInputMember_documentation_en-US" xlink:label="lab_dec_ForwardCurveMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Forward Curve, Measurement Input</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ForwardCurveMeasurementInputMember" xlink:href="dec-20250630.xsd#dec_ForwardCurveMeasurementInputMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ForwardCurveMeasurementInputMember" xlink:to="lab_dec_ForwardCurveMeasurementInputMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherEmployeeExpense_6dd693c4-0826-4656-b3a9-73992ac5f1df_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherEmployeeExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Benefits</link:label>
    <link:label id="lab_ifrs-full_OtherEmployeeExpense_label_en-US" xlink:label="lab_ifrs-full_OtherEmployeeExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other employee expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherEmployeeExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherEmployeeExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherEmployeeExpense" xlink:to="lab_ifrs-full_OtherEmployeeExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_EquityCompensationThroughEmployeeBenefitTrustMember_d15a9c21-be8e-4ddf-ab70-5d83394fd594_terseLabel_en-US" xlink:label="lab_dec_EquityCompensationThroughEmployeeBenefitTrustMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Compensation Through EBT</link:label>
    <link:label id="lab_dec_EquityCompensationThroughEmployeeBenefitTrustMember_label_en-US" xlink:label="lab_dec_EquityCompensationThroughEmployeeBenefitTrustMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Compensation Through Employee Benefit Trust [Member]</link:label>
    <link:label id="lab_dec_EquityCompensationThroughEmployeeBenefitTrustMember_documentation_en-US" xlink:label="lab_dec_EquityCompensationThroughEmployeeBenefitTrustMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity Compensation Through Employee Benefit Trust</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_EquityCompensationThroughEmployeeBenefitTrustMember" xlink:href="dec-20250630.xsd#dec_EquityCompensationThroughEmployeeBenefitTrustMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_EquityCompensationThroughEmployeeBenefitTrustMember" xlink:to="lab_dec_EquityCompensationThroughEmployeeBenefitTrustMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_EmployeesAdministrativeCostsAndProfessionalServicesMember_6eab9897-317b-4cbe-ba10-02562dc42777_terseLabel_en-US" xlink:label="lab_dec_EmployeesAdministrativeCostsAndProfessionalServicesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employees administrative costs and professional services</link:label>
    <link:label id="lab_dec_EmployeesAdministrativeCostsAndProfessionalServicesMember_label_en-US" xlink:label="lab_dec_EmployeesAdministrativeCostsAndProfessionalServicesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employees, Administrative Costs And Professional Services [Member]</link:label>
    <link:label id="lab_dec_EmployeesAdministrativeCostsAndProfessionalServicesMember_documentation_en-US" xlink:label="lab_dec_EmployeesAdministrativeCostsAndProfessionalServicesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employees, Administrative Costs And Professional Services</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_EmployeesAdministrativeCostsAndProfessionalServicesMember" xlink:href="dec-20250630.xsd#dec_EmployeesAdministrativeCostsAndProfessionalServicesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_EmployeesAdministrativeCostsAndProfessionalServicesMember" xlink:to="lab_dec_EmployeesAdministrativeCostsAndProfessionalServicesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_AcquisitionConsiderationMember_71dee6b8-f192-45e5-84b2-b7e35cf3ece8_terseLabel_en-US" xlink:label="lab_dec_AcquisitionConsiderationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisition Consideration</link:label>
    <link:label id="lab_dec_AcquisitionConsiderationMember_label_en-US" xlink:label="lab_dec_AcquisitionConsiderationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Acquisition Consideration [Member]</link:label>
    <link:label id="lab_dec_AcquisitionConsiderationMember_documentation_en-US" xlink:label="lab_dec_AcquisitionConsiderationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Acquisition Consideration</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AcquisitionConsiderationMember" xlink:href="dec-20250630.xsd#dec_AcquisitionConsiderationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AcquisitionConsiderationMember" xlink:to="lab_dec_AcquisitionConsiderationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_TermLoanIMember_6e0f3a6a-3120-4357-8819-e3b3a921f489_terseLabel_en-US" xlink:label="lab_dec_TermLoanIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term Loan I</link:label>
    <link:label id="lab_dec_TermLoanIMember_label_en-US" xlink:label="lab_dec_TermLoanIMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Term Loan I [Member]</link:label>
    <link:label id="lab_dec_TermLoanIMember_documentation_en-US" xlink:label="lab_dec_TermLoanIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Term Loan I</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_TermLoanIMember" xlink:href="dec-20250630.xsd#dec_TermLoanIMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_TermLoanIMember" xlink:to="lab_dec_TermLoanIMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncontrollingInterests_3cff0f34-d08c-43de-b11d-e7f196957394_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncontrollingInterests" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-controlling interest</link:label>
    <link:label id="lab_ifrs-full_NoncontrollingInterests_label_en-US" xlink:label="lab_ifrs-full_NoncontrollingInterests" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-controlling interests</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterests" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncontrollingInterests"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncontrollingInterests" xlink:to="lab_ifrs-full_NoncontrollingInterests" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentLiabilitiesAbstract_badabf52-6c00-4500-b3fc-a14905a7dac0_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current liabilities:</link:label>
    <link:label id="lab_ifrs-full_CurrentLiabilitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CurrentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current liabilities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentLiabilitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLiabilitiesAbstract" xlink:to="lab_ifrs-full_CurrentLiabilitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeAssetSubjectToMasterNettingArrangementLiabilityOffsetAbstract_598d48c5-9c85-423d-82c5-b15ba1bad98a_terseLabel_en-US" xlink:label="lab_dec_DerivativeAssetSubjectToMasterNettingArrangementLiabilityOffsetAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effects of Netting</link:label>
    <link:label id="lab_dec_DerivativeAssetSubjectToMasterNettingArrangementLiabilityOffsetAbstract_label_en-US" xlink:label="lab_dec_DerivativeAssetSubjectToMasterNettingArrangementLiabilityOffsetAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Subject To Master Netting Arrangement, Liability Offset [Abstract]</link:label>
    <link:label id="lab_dec_DerivativeAssetSubjectToMasterNettingArrangementLiabilityOffsetAbstract_documentation_en-US" xlink:label="lab_dec_DerivativeAssetSubjectToMasterNettingArrangementLiabilityOffsetAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Asset, Subject To Master Netting Arrangement, Liability Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeAssetSubjectToMasterNettingArrangementLiabilityOffsetAbstract" xlink:href="dec-20250630.xsd#dec_DerivativeAssetSubjectToMasterNettingArrangementLiabilityOffsetAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeAssetSubjectToMasterNettingArrangementLiabilityOffsetAbstract" xlink:to="lab_dec_DerivativeAssetSubjectToMasterNettingArrangementLiabilityOffsetAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CurrentDerivativeLiabilityAssetOffset_fa8f0042-cd5a-46c0-8421-b057dd5944bd_terseLabel_en-US" xlink:label="lab_dec_CurrentDerivativeLiabilityAssetOffset" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current liabilities</link:label>
    <link:label id="lab_dec_CurrentDerivativeLiabilityAssetOffset_label_en-US" xlink:label="lab_dec_CurrentDerivativeLiabilityAssetOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Derivative Liability, Asset Offset</link:label>
    <link:label id="lab_dec_CurrentDerivativeLiabilityAssetOffset_documentation_en-US" xlink:label="lab_dec_CurrentDerivativeLiabilityAssetOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Current Derivative Liability, Asset Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CurrentDerivativeLiabilityAssetOffset" xlink:href="dec-20250630.xsd#dec_CurrentDerivativeLiabilityAssetOffset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CurrentDerivativeLiabilityAssetOffset" xlink:to="lab_dec_CurrentDerivativeLiabilityAssetOffset" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_PurchasedPutContractMember_347e89c1-b278-4806-9d3c-1165f43d9cd5_terseLabel_en-US" xlink:label="lab_dec_PurchasedPutContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchased puts</link:label>
    <link:label id="lab_dec_PurchasedPutContractMember_label_en-US" xlink:label="lab_dec_PurchasedPutContractMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchased Put Contract [Member]</link:label>
    <link:label id="lab_dec_PurchasedPutContractMember_documentation_en-US" xlink:label="lab_dec_PurchasedPutContractMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Purchased Put Contract</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_PurchasedPutContractMember" xlink:href="dec-20250630.xsd#dec_PurchasedPutContractMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_PurchasedPutContractMember" xlink:to="lab_dec_PurchasedPutContractMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_RelatedPartyAbstract_label_en-US" xlink:label="lab_dec_RelatedPartyAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party [Abstract]</link:label>
    <link:label id="lab_dec_RelatedPartyAbstract_documentation_en-US" xlink:label="lab_dec_RelatedPartyAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Related Party [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_RelatedPartyAbstract" xlink:href="dec-20250630.xsd#dec_RelatedPartyAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_RelatedPartyAbstract" xlink:to="lab_dec_RelatedPartyAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_e27b7754-b7ae-456d-bcdb-cd83fcfcbaf3_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-controlling interest</link:label>
    <link:label id="lab_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_label_en-US" xlink:label="lab_ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit (loss), attributable to non-controlling interests</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:to="lab_ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantProductionVolume_2f67a27f-ba58-47be-bc02-8ba5dbe6d7e8_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantProductionVolume" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Production volumes</link:label>
    <link:label id="lab_dec_BorrowingsCovenantProductionVolume_label_en-US" xlink:label="lab_dec_BorrowingsCovenantProductionVolume" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Production Volume</link:label>
    <link:label id="lab_dec_BorrowingsCovenantProductionVolume_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantProductionVolume" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Production Volume</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantProductionVolume" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantProductionVolume"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantProductionVolume" xlink:to="lab_dec_BorrowingsCovenantProductionVolume" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsNumberOfPropertiesCollateralizingBorrowing_8b223555-cfdf-4262-9126-263ef6b5e7df_terseLabel_en-US" xlink:label="lab_dec_BorrowingsNumberOfPropertiesCollateralizingBorrowing" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of natural gas processing plants and various natural gas compressors and related support equipment in the Central Region, collateralizing borrowings</link:label>
    <link:label id="lab_dec_BorrowingsNumberOfPropertiesCollateralizingBorrowing_label_en-US" xlink:label="lab_dec_BorrowingsNumberOfPropertiesCollateralizingBorrowing" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Number Of Properties Collateralizing Borrowing</link:label>
    <link:label id="lab_dec_BorrowingsNumberOfPropertiesCollateralizingBorrowing_documentation_en-US" xlink:label="lab_dec_BorrowingsNumberOfPropertiesCollateralizingBorrowing" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Number Of Properties Collateralizing Borrowing</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsNumberOfPropertiesCollateralizingBorrowing" xlink:href="dec-20250630.xsd#dec_BorrowingsNumberOfPropertiesCollateralizingBorrowing"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsNumberOfPropertiesCollateralizingBorrowing" xlink:to="lab_dec_BorrowingsNumberOfPropertiesCollateralizingBorrowing" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DeferredForeignIncomeTaxExpenseIncome_eb25b8ba-c85e-4298-af17-cac5ca14807b_terseLabel_en-US" xlink:label="lab_dec_DeferredForeignIncomeTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign - UK (benefit) expense</link:label>
    <link:label id="lab_dec_DeferredForeignIncomeTaxExpenseIncome_label_en-US" xlink:label="lab_dec_DeferredForeignIncomeTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Foreign Income Tax Expense (Income)</link:label>
    <link:label id="lab_dec_DeferredForeignIncomeTaxExpenseIncome_documentation_en-US" xlink:label="lab_dec_DeferredForeignIncomeTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Deferred Foreign Income Tax Expense (Income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DeferredForeignIncomeTaxExpenseIncome" xlink:href="dec-20250630.xsd#dec_DeferredForeignIncomeTaxExpenseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DeferredForeignIncomeTaxExpenseIncome" xlink:to="lab_dec_DeferredForeignIncomeTaxExpenseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAbstract_bf669c52-307c-4817-8734-8564125d5247_terseLabel_en-US" xlink:label="lab_ifrs-full_EquityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shareholders' equity:</link:label>
    <link:label id="lab_ifrs-full_EquityAbstract_label_en-US" xlink:label="lab_ifrs-full_EquityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAbstract" xlink:to="lab_ifrs-full_EquityAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherExpenseByNature_4c2e8f53-0be1-4a80-9642-3781d64671cc_totalLabel_en-US" xlink:label="lab_ifrs-full_OtherExpenseByNature" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total expenses</link:label>
    <link:label id="lab_ifrs-full_OtherExpenseByNature_label_en-US" xlink:label="lab_ifrs-full_OtherExpenseByNature" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other expenses, by nature</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherExpenseByNature" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherExpenseByNature"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherExpenseByNature" xlink:to="lab_ifrs-full_OtherExpenseByNature" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable_27a5ef2e-3440-4605-9138-abcd88a9f763_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of disaggregation of revenue from contracts with customers [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of disaggregation of revenue from contracts with customers [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable" xlink:to="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialInstrumentsAbstract_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about financial instruments [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsAbstract" xlink:to="lab_ifrs-full_DisclosureOfFinancialInstrumentsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DeferredIncomeTaxExpenseIncomeAbstract_69a8ab79-29cf-4196-93c8-1f9ab1f3eb06_terseLabel_en-US" xlink:label="lab_dec_DeferredIncomeTaxExpenseIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income tax (benefit) expense</link:label>
    <link:label id="lab_dec_DeferredIncomeTaxExpenseIncomeAbstract_label_en-US" xlink:label="lab_dec_DeferredIncomeTaxExpenseIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Income) [Abstract]</link:label>
    <link:label id="lab_dec_DeferredIncomeTaxExpenseIncomeAbstract_documentation_en-US" xlink:label="lab_dec_DeferredIncomeTaxExpenseIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DeferredIncomeTaxExpenseIncomeAbstract" xlink:href="dec-20250630.xsd#dec_DeferredIncomeTaxExpenseIncomeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DeferredIncomeTaxExpenseIncomeAbstract" xlink:to="lab_dec_DeferredIncomeTaxExpenseIncomeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsExplanatory_8ff06b7e-f4b4-49ee-b65a-aa011ad0a12a_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Financial Assets</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of fair value measurement of assets [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFairValueMeasurementOfAssetsExplanatory"/>
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    <link:label id="lab_dec_Dividends1Abstract_label_en-US" xlink:label="lab_dec_Dividends1Abstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends1 [Abstract]</link:label>
    <link:label id="lab_dec_Dividends1Abstract_documentation_en-US" xlink:label="lab_dec_Dividends1Abstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Dividends1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_Dividends1Abstract" xlink:href="dec-20250630.xsd#dec_Dividends1Abstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_Dividends1Abstract" xlink:to="lab_dec_Dividends1Abstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_AssetAcquisitionDeferredConsiderationAmortizingDebt_e2cd0070-5c28-4b7f-ba9c-f37980085ad2_terseLabel_en-US" xlink:label="lab_dec_AssetAcquisitionDeferredConsiderationAmortizingDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notes and debentures issued</link:label>
    <link:label id="lab_dec_AssetAcquisitionDeferredConsiderationAmortizingDebt_label_en-US" xlink:label="lab_dec_AssetAcquisitionDeferredConsiderationAmortizingDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Deferred Consideration, Amortizing Debt</link:label>
    <link:label id="lab_dec_AssetAcquisitionDeferredConsiderationAmortizingDebt_documentation_en-US" xlink:label="lab_dec_AssetAcquisitionDeferredConsiderationAmortizingDebt" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Deferred Consideration, Amortizing Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetAcquisitionDeferredConsiderationAmortizingDebt" xlink:href="dec-20250630.xsd#dec_AssetAcquisitionDeferredConsiderationAmortizingDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AssetAcquisitionDeferredConsiderationAmortizingDebt" xlink:to="lab_dec_AssetAcquisitionDeferredConsiderationAmortizingDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PortionOfConsiderationPaidReceivedConsistingOfCashAndCashEquivalents_c2002f90-4668-4820-ba6b-52aa4cb7ef47_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_PortionOfConsiderationPaidReceivedConsistingOfCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from divestitures</link:label>
    <link:label id="lab_ifrs-full_PortionOfConsiderationPaidReceivedConsistingOfCashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_PortionOfConsiderationPaidReceivedConsistingOfCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Portion of consideration paid (received) consisting of cash and cash equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PortionOfConsiderationPaidReceivedConsistingOfCashAndCashEquivalents" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PortionOfConsiderationPaidReceivedConsistingOfCashAndCashEquivalents"/>
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    <link:label id="lab_dec_BorrowingsCovenantLeverageRatio_3db84d6a-7248-4c7c-8e36-a37474445c60_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantLeverageRatio" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings covenant, maximum leverage ratio</link:label>
    <link:label id="lab_dec_BorrowingsCovenantLeverageRatio_label_en-US" xlink:label="lab_dec_BorrowingsCovenantLeverageRatio" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Leverage Ratio</link:label>
    <link:label id="lab_dec_BorrowingsCovenantLeverageRatio_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantLeverageRatio" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Leverage Ratio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantLeverageRatio" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantLeverageRatio"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantLeverageRatio" xlink:to="lab_dec_BorrowingsCovenantLeverageRatio" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfOilAndGasAssets_9d274db5-5de1-49eb-bf4e-65e8a404443b_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfOilAndGasAssets" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Expenditures on natural gas and oil properties and equipment</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfOilAndGasAssets_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfOilAndGasAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase of oil and gas assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfOilAndGasAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchaseOfOilAndGasAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfOilAndGasAssets" xlink:to="lab_ifrs-full_PurchaseOfOilAndGasAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_e350dae0-3508-4515-8776-74b536f5ea6e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems" xlink:to="lab_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OtherCurrentLiabilitiesRecognizedAsOfAcquisitionDate_2d358619-4aa3-45f2-9d5a-12556560d988_negatedTerseLabel_en-US" xlink:label="lab_dec_OtherCurrentLiabilitiesRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other current liabilities</link:label>
    <link:label id="lab_dec_OtherCurrentLiabilitiesRecognizedAsOfAcquisitionDate_label_en-US" xlink:label="lab_dec_OtherCurrentLiabilitiesRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Current Liabilities Recognized As Of Acquisition Date</link:label>
    <link:label id="lab_dec_OtherCurrentLiabilitiesRecognizedAsOfAcquisitionDate_documentation_en-US" xlink:label="lab_dec_OtherCurrentLiabilitiesRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Current Liabilities Recognized As Of Acquisition Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherCurrentLiabilitiesRecognizedAsOfAcquisitionDate" xlink:href="dec-20250630.xsd#dec_OtherCurrentLiabilitiesRecognizedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OtherCurrentLiabilitiesRecognizedAsOfAcquisitionDate" xlink:to="lab_dec_OtherCurrentLiabilitiesRecognizedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeAssetAbstract_f7a0c541-b03d-42c5-aca3-6f6ee7a8b705_terseLabel_en-US" xlink:label="lab_dec_DerivativeAssetAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets:</link:label>
    <link:label id="lab_dec_DerivativeAssetAbstract_label_en-US" xlink:label="lab_dec_DerivativeAssetAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset [Abstract]</link:label>
    <link:label id="lab_dec_DerivativeAssetAbstract_documentation_en-US" xlink:label="lab_dec_DerivativeAssetAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Asset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeAssetAbstract" xlink:href="dec-20250630.xsd#dec_DerivativeAssetAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeAssetAbstract" xlink:to="lab_dec_DerivativeAssetAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_Commodity1Member_ec4d1973-3958-42c8-ad8b-ffbd335c681d_verboseLabel_en-US" xlink:label="lab_dec_Commodity1Member" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total commodity revenue</link:label>
    <link:label id="lab_dec_Commodity1Member_label_en-US" xlink:label="lab_dec_Commodity1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commodity1 [Member]</link:label>
    <link:label id="lab_dec_Commodity1Member_documentation_en-US" xlink:label="lab_dec_Commodity1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Commodity1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_Commodity1Member" xlink:href="dec-20250630.xsd#dec_Commodity1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_Commodity1Member" xlink:to="lab_dec_Commodity1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeFixedInterestRate1_5474b43a-acbc-49c8-9b65-e287b6f34aa2_terseLabel_en-US" xlink:label="lab_dec_DerivativeFixedInterestRate1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed Rate</link:label>
    <link:label id="lab_dec_DerivativeFixedInterestRate1_label_en-US" xlink:label="lab_dec_DerivativeFixedInterestRate1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Fixed Interest Rate1</link:label>
    <link:label id="lab_dec_DerivativeFixedInterestRate1_documentation_en-US" xlink:label="lab_dec_DerivativeFixedInterestRate1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative, Fixed Interest Rate1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeFixedInterestRate1" xlink:href="dec-20250630.xsd#dec_DerivativeFixedInterestRate1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeFixedInterestRate1" xlink:to="lab_dec_DerivativeFixedInterestRate1" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_HedgedRevenueOfAssetAcquisitionSinceAcquisitionDate_c0e9d9b3-9a70-4929-95ac-6223d23c4d00_terseLabel_en-US" xlink:label="lab_dec_HedgedRevenueOfAssetAcquisitionSinceAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue of asset acquisition since acquisition date</link:label>
    <link:label id="lab_dec_HedgedRevenueOfAssetAcquisitionSinceAcquisitionDate_label_en-US" xlink:label="lab_dec_HedgedRevenueOfAssetAcquisitionSinceAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Hedged Revenue of Asset Acquisition Since Acquisition Date</link:label>
    <link:label id="lab_dec_HedgedRevenueOfAssetAcquisitionSinceAcquisitionDate_documentation_en-US" xlink:label="lab_dec_HedgedRevenueOfAssetAcquisitionSinceAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Hedged Revenue of Asset Acquisition Since Acquisition Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_HedgedRevenueOfAssetAcquisitionSinceAcquisitionDate" xlink:href="dec-20250630.xsd#dec_HedgedRevenueOfAssetAcquisitionSinceAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_HedgedRevenueOfAssetAcquisitionSinceAcquisitionDate" xlink:to="lab_dec_HedgedRevenueOfAssetAcquisitionSinceAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsIncreaseDecreaseToInterestRateBasisForFailureToAchieveSustainabilityLinkedPerformanceTargets_b57bfc26-4a60-4729-a0d0-aca3b69bd7be_terseLabel_en-US" xlink:label="lab_dec_BorrowingsIncreaseDecreaseToInterestRateBasisForFailureToAchieveSustainabilityLinkedPerformanceTargets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in interest rate basis for failure to achieve sustainability-linked performance targets</link:label>
    <link:label id="lab_dec_BorrowingsIncreaseDecreaseToInterestRateBasisForFailureToAchieveSustainabilityLinkedPerformanceTargets_label_en-US" xlink:label="lab_dec_BorrowingsIncreaseDecreaseToInterestRateBasisForFailureToAchieveSustainabilityLinkedPerformanceTargets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Increase (Decrease) To Interest Rate Basis For Failure To Achieve Sustainability-Linked Performance Targets</link:label>
    <link:label id="lab_dec_BorrowingsIncreaseDecreaseToInterestRateBasisForFailureToAchieveSustainabilityLinkedPerformanceTargets_documentation_en-US" xlink:label="lab_dec_BorrowingsIncreaseDecreaseToInterestRateBasisForFailureToAchieveSustainabilityLinkedPerformanceTargets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Increase (Decrease) To Interest Rate Basis For Failure To Achieve Sustainability-Linked Performance Targets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsIncreaseDecreaseToInterestRateBasisForFailureToAchieveSustainabilityLinkedPerformanceTargets" xlink:href="dec-20250630.xsd#dec_BorrowingsIncreaseDecreaseToInterestRateBasisForFailureToAchieveSustainabilityLinkedPerformanceTargets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsIncreaseDecreaseToInterestRateBasisForFailureToAchieveSustainabilityLinkedPerformanceTargets" xlink:to="lab_dec_BorrowingsIncreaseDecreaseToInterestRateBasisForFailureToAchieveSustainabilityLinkedPerformanceTargets" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_AmortizationOfDiscountAndDeferredFinanceCosts_6ae5a3f0-c087-44e6-a010-3c947a0363b3_terseLabel_en-US" xlink:label="lab_dec_AmortizationOfDiscountAndDeferredFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of discount and deferred finance costs</link:label>
    <link:label id="lab_dec_AmortizationOfDiscountAndDeferredFinanceCosts_eef758fb-7acd-4d6a-874c-a414e673bcb2_verboseLabel_en-US" xlink:label="lab_dec_AmortizationOfDiscountAndDeferredFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Amortization of discount and deferred financing costs</link:label>
    <link:label id="lab_dec_AmortizationOfDiscountAndDeferredFinanceCosts_label_en-US" xlink:label="lab_dec_AmortizationOfDiscountAndDeferredFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Discount and Deferred Finance Costs</link:label>
    <link:label id="lab_dec_AmortizationOfDiscountAndDeferredFinanceCosts_documentation_en-US" xlink:label="lab_dec_AmortizationOfDiscountAndDeferredFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amortization of Discount and Deferred Finance Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AmortizationOfDiscountAndDeferredFinanceCosts" xlink:href="dec-20250630.xsd#dec_AmortizationOfDiscountAndDeferredFinanceCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AmortizationOfDiscountAndDeferredFinanceCosts" xlink:to="lab_dec_AmortizationOfDiscountAndDeferredFinanceCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis_02e2a050-c9e1-4fff-aa19-d04264ae3ef7_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest rate spread</link:label>
    <link:label id="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis_label_en-US" xlink:label="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, adjustment to interest rate basis</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsAdjustmentToInterestRateBasis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:to="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_5a385be8-05a3-4772-823e-611f3225dee1_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Consideration for business acquisitions, net of cash acquired</link:label>
    <link:label id="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities</link:label>
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    <link:label id="lab_dec_ThreeWayCollarContractSoldCallsMember_52be102c-97e3-4f3a-9644-e55cbaf9c5d2_terseLabel_en-US" xlink:label="lab_dec_ThreeWayCollarContractSoldCallsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Three Way Collar Contract Sold Calls</link:label>
    <link:label id="lab_dec_ThreeWayCollarContractSoldCallsMember_label_en-US" xlink:label="lab_dec_ThreeWayCollarContractSoldCallsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Way Collar Contract Sold Calls [Member]</link:label>
    <link:label id="lab_dec_ThreeWayCollarContractSoldCallsMember_documentation_en-US" xlink:label="lab_dec_ThreeWayCollarContractSoldCallsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Way Collar Contract Sold Calls</link:label>
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    <link:label id="lab_dec_InterestContractsMember_99ca4ff6-adbe-46c1-ad98-9c72733a0d19_terseLabel_en-US" xlink:label="lab_dec_InterestContractsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest</link:label>
    <link:label id="lab_dec_InterestContractsMember_label_en-US" xlink:label="lab_dec_InterestContractsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Contracts [Member]</link:label>
    <link:label id="lab_dec_InterestContractsMember_documentation_en-US" xlink:label="lab_dec_InterestContractsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Contracts</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_InterestContractsMember" xlink:href="dec-20250630.xsd#dec_InterestContractsMember"/>
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    <link:label id="lab_dec_AcquisitionRelatedCostsForAssetAcquisition_e34fa865-882b-47df-b359-b1ba6671b650_terseLabel_en-US" xlink:label="lab_dec_AcquisitionRelatedCostsForAssetAcquisition" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transaction costs</link:label>
    <link:label id="lab_dec_AcquisitionRelatedCostsForAssetAcquisition_label_en-US" xlink:label="lab_dec_AcquisitionRelatedCostsForAssetAcquisition" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Acquisition-Related Costs For Asset Acquisition</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_AcquisitionRelatedCostsForAssetAcquisition" xlink:href="dec-20250630.xsd#dec_AcquisitionRelatedCostsForAssetAcquisition"/>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions_563c4ec3-59e7-45ee-a912-b70e3fdade93_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Repurchase of shares (EBT)</link:label>
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    <link:label id="lab_ifrs-full_SharePremiumMember_71afc370-5589-4104-b0af-cbf2fa9fa23a_terseLabel_en-US" xlink:label="lab_ifrs-full_SharePremiumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share Premium</link:label>
    <link:label id="lab_ifrs-full_SharePremiumMember_ed1ca5f7-e849-4292-8c65-9f541b223642_verboseLabel_en-US" xlink:label="lab_ifrs-full_SharePremiumMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total Share Premium</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfContingentLiabilitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfContingentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of contingent liabilities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesAbstract"/>
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    <link:label id="lab_dec_AssetsAcquisitionAxis_3cb6332e-7c13-4d62-aa44-7fb913adbd3e_terseLabel_en-US" xlink:label="lab_dec_AssetsAcquisitionAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets Acquisition [Axis]</link:label>
    <link:label id="lab_dec_AssetsAcquisitionAxis_label_en-US" xlink:label="lab_dec_AssetsAcquisitionAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets Acquisition [Axis]</link:label>
    <link:label id="lab_dec_AssetsAcquisitionAxis_documentation_en-US" xlink:label="lab_dec_AssetsAcquisitionAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Assets Acquisition</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetsAcquisitionAxis" xlink:href="dec-20250630.xsd#dec_AssetsAcquisitionAxis"/>
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    <link:label id="lab_dec_DecreaseInRestrictedCash_d86e4ad1-51d0-4428-8839-83ef45e20811_terseLabel_en-US" xlink:label="lab_dec_DecreaseInRestrictedCash" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Decrease in restricted cash</link:label>
    <link:label id="lab_dec_DecreaseInRestrictedCash_label_en-US" xlink:label="lab_dec_DecreaseInRestrictedCash" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Decrease in restricted cash</link:label>
    <link:label id="lab_dec_DecreaseInRestrictedCash_documentation_en-US" xlink:label="lab_dec_DecreaseInRestrictedCash" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Decrease in restricted cash</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DecreaseInRestrictedCash" xlink:href="dec-20250630.xsd#dec_DecreaseInRestrictedCash"/>
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    <link:label id="lab_dec_AssetsAcquisitionNotesPayable_a01a2e32-4f83-4ff5-99f3-e7aebdc7e250_terseLabel_en-US" xlink:label="lab_dec_AssetsAcquisitionNotesPayable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notes payable</link:label>
    <link:label id="lab_dec_AssetsAcquisitionNotesPayable_label_en-US" xlink:label="lab_dec_AssetsAcquisitionNotesPayable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets Acquisition Notes Payable</link:label>
    <link:label id="lab_dec_AssetsAcquisitionNotesPayable_documentation_en-US" xlink:label="lab_dec_AssetsAcquisitionNotesPayable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Assets Acquisition Notes Payable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetsAcquisitionNotesPayable" xlink:href="dec-20250630.xsd#dec_AssetsAcquisitionNotesPayable"/>
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    <link:label id="lab_dec_ScheduleOfFinancialStatementLocationOfDerivativeInstrumentsTableTextBlock_5568301e-f5f8-4262-a36b-6a3c4057801a_terseLabel_en-US" xlink:label="lab_dec_ScheduleOfFinancialStatementLocationOfDerivativeInstrumentsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of net derivatives</link:label>
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    <link:label id="lab_dec_BorrowingsNetOfDiscountsAndDeferredFinanceCosts_aef55cc3-7cc8-40df-a4b0-ffdfe427e71e_periodStartLabel_en-US" xlink:label="lab_dec_BorrowingsNetOfDiscountsAndDeferredFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at beginning of period</link:label>
    <link:label id="lab_dec_BorrowingsNetOfDiscountsAndDeferredFinanceCosts_e53f4c06-6aa5-4ae4-9280-a9f51a44536e_periodEndLabel_en-US" xlink:label="lab_dec_BorrowingsNetOfDiscountsAndDeferredFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance at end of period</link:label>
    <link:label id="lab_dec_BorrowingsNetOfDiscountsAndDeferredFinanceCosts_label_en-US" xlink:label="lab_dec_BorrowingsNetOfDiscountsAndDeferredFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Net Of Discounts And Deferred Finance Costs</link:label>
    <link:label id="lab_dec_BorrowingsNetOfDiscountsAndDeferredFinanceCosts_documentation_en-US" xlink:label="lab_dec_BorrowingsNetOfDiscountsAndDeferredFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Net Of Discounts And Deferred Finance Costs</link:label>
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    <link:label id="lab_dec_CostMeasurementInputMember_661e0875-5b72-424b-85e9-a99b16ef7ba2_terseLabel_en-US" xlink:label="lab_dec_CostMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_CostMeasurementInputMember" xlink:href="dec-20250630.xsd#dec_CostMeasurementInputMember"/>
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    <link:label id="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsAssetsExplanatory_b7adc6cc-e717-4a53-8c57-9d17e107acba_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSensitivityAnalysisOfFairValueMeasurementToChangesInUnobservableInputsAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Impact of Reasonably Possible 10% Change in Assumption</link:label>
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    <link:label id="lab_dec_AcquisitionsAndDivestituresAbstract_2dee2d2a-122d-48a4-a9f2-da883d82797d_terseLabel_en-US" xlink:label="lab_dec_AcquisitionsAndDivestituresAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisitions And Divestitures [Abstract]</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory_39f83dcf-6f96-4de5-873b-f194042e4c9b_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade Receivables</link:label>
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    <link:label id="lab_ifrs-full_Liabilities_39d6fae7-69a8-452c-8871-4612780cec84_totalLabel_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total liabilities</link:label>
    <link:label id="lab_ifrs-full_Liabilities_55e83134-f248-419a-92ff-b0cb7c423807_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Liabilities</link:label>
    <link:label id="lab_ifrs-full_Liabilities_label_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Liabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Liabilities" xlink:to="lab_ifrs-full_Liabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherTaxRateEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_3cad4f38-e0a6-475b-b610-d9c2ca498a3f_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherTaxRateEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other, net</link:label>
    <link:label id="lab_ifrs-full_OtherTaxRateEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_label_en-US" xlink:label="lab_ifrs-full_OtherTaxRateEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other tax rate effects for reconciliation between accounting profit and tax expense (income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherTaxRateEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherTaxRateEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherTaxRateEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:to="lab_ifrs-full_OtherTaxRateEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantMinimumBookEquity_06a1752e-c7c3-4b31-8149-7787c11bcdf0_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantMinimumBookEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum book equity requirement</link:label>
    <link:label id="lab_dec_BorrowingsCovenantMinimumBookEquity_label_en-US" xlink:label="lab_dec_BorrowingsCovenantMinimumBookEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Minimum Book Equity</link:label>
    <link:label id="lab_dec_BorrowingsCovenantMinimumBookEquity_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantMinimumBookEquity" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Minimum Book Equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantMinimumBookEquity" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantMinimumBookEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantMinimumBookEquity" xlink:to="lab_dec_BorrowingsCovenantMinimumBookEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_NetAssetsAcquiredAbstract_aa739d47-378d-4571-9e58-e9e7546db063_terseLabel_en-US" xlink:label="lab_dec_NetAssetsAcquiredAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net assets acquired</link:label>
    <link:label id="lab_dec_NetAssetsAcquiredAbstract_label_en-US" xlink:label="lab_dec_NetAssetsAcquiredAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net assets acquired [Abstract]</link:label>
    <link:label id="lab_dec_NetAssetsAcquiredAbstract_documentation_en-US" xlink:label="lab_dec_NetAssetsAcquiredAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Net assets acquired</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NetAssetsAcquiredAbstract" xlink:href="dec-20250630.xsd#dec_NetAssetsAcquiredAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_NetAssetsAcquiredAbstract" xlink:to="lab_dec_NetAssetsAcquiredAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IssuedCapital_b8d784a0-191a-49b1-acb5-d8f84197a7b7_terseLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapital" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share capital</link:label>
    <link:label id="lab_ifrs-full_IssuedCapital_label_en-US" xlink:label="lab_ifrs-full_IssuedCapital" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Issued capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapital"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IssuedCapital" xlink:to="lab_ifrs-full_IssuedCapital" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_e91d192e-7669-4461-87f4-695047974bab_terseLabel_en-US" xlink:label="lab_dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table]</link:label>
    <link:label id="lab_dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_label_en-US" xlink:label="lab_dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table]</link:label>
    <link:label id="lab_dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_documentation_en-US" xlink:label="lab_dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable" xlink:href="dec-20250630.xsd#dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable" xlink:to="lab_dec_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantsDomain_30ee9217-3874-4975-9213-e173dae2d01f_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings Covenants [Domain]</link:label>
    <link:label id="lab_dec_BorrowingsCovenantsDomain_label_en-US" xlink:label="lab_dec_BorrowingsCovenantsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings Covenants [Domain]</link:label>
    <link:label id="lab_dec_BorrowingsCovenantsDomain_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantsDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings Covenants [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantsDomain" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantsDomain" xlink:to="lab_dec_BorrowingsCovenantsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_NoncurrentDerivativeAssetBeforeOffset_2dd04760-0f84-4e44-ae67-d302696f2fd5_terseLabel_en-US" xlink:label="lab_dec_NoncurrentDerivativeAssetBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-current assets</link:label>
    <link:label id="lab_dec_NoncurrentDerivativeAssetBeforeOffset_label_en-US" xlink:label="lab_dec_NoncurrentDerivativeAssetBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncurrent Derivative Asset, Before Offset</link:label>
    <link:label id="lab_dec_NoncurrentDerivativeAssetBeforeOffset_documentation_en-US" xlink:label="lab_dec_NoncurrentDerivativeAssetBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Noncurrent Derivative Asset, Before Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NoncurrentDerivativeAssetBeforeOffset" xlink:href="dec-20250630.xsd#dec_NoncurrentDerivativeAssetBeforeOffset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_NoncurrentDerivativeAssetBeforeOffset" xlink:to="lab_dec_NoncurrentDerivativeAssetBeforeOffset" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_GiantLandLLCMember_7a48ddc2-8c6f-4208-a4be-500c39cc2b36_terseLabel_en-US" xlink:label="lab_dec_GiantLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Giant Land, LLC</link:label>
    <link:label id="lab_dec_GiantLandLLCMember_label_en-US" xlink:label="lab_dec_GiantLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Giant Land, LLC [Member]</link:label>
    <link:label id="lab_dec_GiantLandLLCMember_documentation_en-US" xlink:label="lab_dec_GiantLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Giant Land, LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_GiantLandLLCMember" xlink:href="dec-20250630.xsd#dec_GiantLandLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_GiantLandLLCMember" xlink:to="lab_dec_GiantLandLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_PercentageOfAssetsHedged_b9acf0e1-a33e-42d8-bd5a-5be85b3c288a_terseLabel_en-US" xlink:label="lab_dec_PercentageOfAssetsHedged" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of assets hedged</link:label>
    <link:label id="lab_dec_PercentageOfAssetsHedged_label_en-US" xlink:label="lab_dec_PercentageOfAssetsHedged" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of Assets Hedged</link:label>
    <link:label id="lab_dec_PercentageOfAssetsHedged_documentation_en-US" xlink:label="lab_dec_PercentageOfAssetsHedged" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of Assets Hedged</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_PercentageOfAssetsHedged" xlink:href="dec-20250630.xsd#dec_PercentageOfAssetsHedged"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_PercentageOfAssetsHedged" xlink:to="lab_dec_PercentageOfAssetsHedged" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CreditFacilityMember_19ef95fa-374c-4061-bb12-32b16c1a6ac6_terseLabel_en-US" xlink:label="lab_dec_CreditFacilityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility</link:label>
    <link:label id="lab_dec_CreditFacilityMember_label_en-US" xlink:label="lab_dec_CreditFacilityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility [Member]</link:label>
    <link:label id="lab_dec_CreditFacilityMember_documentation_en-US" xlink:label="lab_dec_CreditFacilityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Credit Facility</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CreditFacilityMember" xlink:href="dec-20250630.xsd#dec_CreditFacilityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CreditFacilityMember" xlink:to="lab_dec_CreditFacilityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DiversifiedABSVILLCMember_ec2439af-420e-47f7-864f-720e3a6fc02c_terseLabel_en-US" xlink:label="lab_dec_DiversifiedABSVILLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Diversified ABS VI LLC</link:label>
    <link:label id="lab_dec_DiversifiedABSVILLCMember_label_en-US" xlink:label="lab_dec_DiversifiedABSVILLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Diversified ABS VI LLC [Member]</link:label>
    <link:label id="lab_dec_DiversifiedABSVILLCMember_documentation_en-US" xlink:label="lab_dec_DiversifiedABSVILLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Diversified ABS VI LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DiversifiedABSVILLCMember" xlink:href="dec-20250630.xsd#dec_DiversifiedABSVILLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DiversifiedABSVILLCMember" xlink:to="lab_dec_DiversifiedABSVILLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfSharesOutstanding_229a6d1f-5428-4919-ab2e-bb9147ab2b21_periodStartLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Number of shares outstanding at beginning of period (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesOutstanding_fa59594b-c944-443a-a1b4-acd3f890b65d_periodEndLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Number of shares outstanding at end of period (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesOutstanding_27f9d7b4-fa39-4e39-8280-9bad2d18d072_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shares Outstanding (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesOutstanding_label_en-US" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of shares outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NumberOfSharesOutstanding" xlink:to="lab_ifrs-full_NumberOfSharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_be07b459-1f9d-4623-9375-a5043649bbb4_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Trade and other payables</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade and other payables recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate" xlink:to="lab_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory_632fbe3c-b5f7-4999-a22e-1176b728d0c6_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible Assets</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for intangible assets other than goodwill [text block]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_EquityPlacementsMember_27fdfd92-fbe7-41d5-8c6e-d1edd883ff04_terseLabel_en-US" xlink:label="lab_dec_EquityPlacementsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity placement</link:label>
    <link:label id="lab_dec_EquityPlacementsMember_label_en-US" xlink:label="lab_dec_EquityPlacementsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Placements [Member]</link:label>
    <link:label id="lab_dec_EquityPlacementsMember_documentation_en-US" xlink:label="lab_dec_EquityPlacementsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity Placements</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_EquityPlacementsMember" xlink:href="dec-20250630.xsd#dec_EquityPlacementsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_EquityPlacementsMember" xlink:to="lab_dec_EquityPlacementsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_NonCurrentDerivativeAssetsLiabilities_30c668c2-053f-4a9e-bc32-7552c01d30e1_totalLabel_en-US" xlink:label="lab_dec_NonCurrentDerivativeAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net assets (liabilities) - non-current</link:label>
    <link:label id="lab_dec_NonCurrentDerivativeAssetsLiabilities_label_en-US" xlink:label="lab_dec_NonCurrentDerivativeAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-Current Derivative Assets (Liabilities)</link:label>
    <link:label id="lab_dec_NonCurrentDerivativeAssetsLiabilities_documentation_en-US" xlink:label="lab_dec_NonCurrentDerivativeAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Non-Current Derivative Assets (Liabilities)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NonCurrentDerivativeAssetsLiabilities" xlink:href="dec-20250630.xsd#dec_NonCurrentDerivativeAssetsLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_NonCurrentDerivativeAssetsLiabilities" xlink:to="lab_dec_NonCurrentDerivativeAssetsLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSMaverickNotesMember_0bfd946c-cae2-4de4-bcc1-dda190c52584_terseLabel_en-US" xlink:label="lab_dec_ABSMaverickNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes</link:label>
    <link:label id="lab_dec_ABSMaverickNotesMember_label_en-US" xlink:label="lab_dec_ABSMaverickNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes [Member]</link:label>
    <link:label id="lab_dec_ABSMaverickNotesMember_documentation_en-US" xlink:label="lab_dec_ABSMaverickNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSMaverickNotesMember" xlink:href="dec-20250630.xsd#dec_ABSMaverickNotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSMaverickNotesMember" xlink:to="lab_dec_ABSMaverickNotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProductsAndServicesAxis_3a92c1b6-09d0-460d-8bf6-150e322f7366_terseLabel_en-US" xlink:label="lab_ifrs-full_ProductsAndServicesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Products and services [axis]</link:label>
    <link:label id="lab_ifrs-full_ProductsAndServicesAxis_label_en-US" xlink:label="lab_ifrs-full_ProductsAndServicesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Products and services [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProductsAndServicesAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProductsAndServicesAxis" xlink:to="lab_ifrs-full_ProductsAndServicesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeAssetLiabilityAbstract_6fbf6402-ae0e-4d41-9f45-190efea6fc35_terseLabel_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">As Presented with Effects of Netting</link:label>
    <link:label id="lab_dec_DerivativeAssetLiabilityAbstract_label_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset (Liability) [Abstract]</link:label>
    <link:label id="lab_dec_DerivativeAssetLiabilityAbstract_documentation_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Asset (Liability)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeAssetLiabilityAbstract" xlink:href="dec-20250630.xsd#dec_DerivativeAssetLiabilityAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeAssetLiabilityAbstract" xlink:to="lab_dec_DerivativeAssetLiabilityAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BasisSwapContractMember_544b7a4c-6cc8-4452-a9f6-b921cec09c44_terseLabel_en-US" xlink:label="lab_dec_BasisSwapContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis swaps</link:label>
    <link:label id="lab_dec_BasisSwapContractMember_label_en-US" xlink:label="lab_dec_BasisSwapContractMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basis Swap Contract [Member]</link:label>
    <link:label id="lab_dec_BasisSwapContractMember_documentation_en-US" xlink:label="lab_dec_BasisSwapContractMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Basis Swap Contract</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BasisSwapContractMember" xlink:href="dec-20250630.xsd#dec_BasisSwapContractMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BasisSwapContractMember" xlink:to="lab_dec_BasisSwapContractMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherPropertyPlantAndEquipmentMember_ffe3fc9b-29f2-4d67-9a4b-d209b7b87720_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other property and equipment</link:label>
    <link:label id="lab_ifrs-full_OtherPropertyPlantAndEquipmentMember_label_en-US" xlink:label="lab_ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other property, plant and equipment [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherPropertyPlantAndEquipmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:to="lab_ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncomeTaxExpenseContinuingOperations_1fc795a9-201b-4caa-96e1-31fd3e8398f9_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Income tax benefit (expense)</link:label>
    <link:label id="lab_ifrs-full_IncomeTaxExpenseContinuingOperations_b0d536d8-2d3b-4f2b-a3d5-aeaa4c93e9a1_terseLabel_en-US" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tax expense (income)</link:label>
    <link:label id="lab_ifrs-full_IncomeTaxExpenseContinuingOperations_9ce2838b-a202-47c7-b875-2b9181eea521_totalLabel_en-US" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total income tax (benefit) expense</link:label>
    <link:label id="lab_ifrs-full_IncomeTaxExpenseContinuingOperations_label_en-US" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax expense (income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:to="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LeaseLiabilitiesMember_fe4ac7d2-30a0-48bc-804a-dddcf84c93ea_terseLabel_en-US" xlink:label="lab_ifrs-full_LeaseLiabilitiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_ifrs-full_LeaseLiabilitiesMember_label_en-US" xlink:label="lab_ifrs-full_LeaseLiabilitiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease liabilities [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilitiesMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilitiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LeaseLiabilitiesMember" xlink:to="lab_ifrs-full_LeaseLiabilitiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SignificantUnobservableInputLiabilities_7a78af9e-90b7-4ceb-a487-fb4f15f03df9_terseLabel_en-US" xlink:label="lab_ifrs-full_SignificantUnobservableInputLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Significant unobservable input, liabilities</link:label>
    <link:label id="lab_ifrs-full_SignificantUnobservableInputLiabilities_label_en-US" xlink:label="lab_ifrs-full_SignificantUnobservableInputLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Significant unobservable input, liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantUnobservableInputLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantUnobservableInputLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SignificantUnobservableInputLiabilities" xlink:to="lab_ifrs-full_SignificantUnobservableInputLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_AssetsAcquisitionDomain_461e1a20-4b97-448d-8f1d-397495cbee6d_terseLabel_en-US" xlink:label="lab_dec_AssetsAcquisitionDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets Acquisition [Domain]</link:label>
    <link:label id="lab_dec_AssetsAcquisitionDomain_label_en-US" xlink:label="lab_dec_AssetsAcquisitionDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets Acquisition [Domain]</link:label>
    <link:label id="lab_dec_AssetsAcquisitionDomain_documentation_en-US" xlink:label="lab_dec_AssetsAcquisitionDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Assets Acquisition [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetsAcquisitionDomain" xlink:href="dec-20250630.xsd#dec_AssetsAcquisitionDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AssetsAcquisitionDomain" xlink:to="lab_dec_AssetsAcquisitionDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory_8dc47ebd-85d6-4442-a513-1f6356d9a17f_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Events</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of events after reporting period [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory" xlink:to="lab_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_5e2139d4-2f4f-40f2-96fa-f02a448cf813_terseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities:</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) operating activities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantBorrowingBaseAvailabilityPercent_0b02fd8a-77e3-4422-a4fe-d388bc704cbd_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantBorrowingBaseAvailabilityPercent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings covenant, borrowing base availability percentage</link:label>
    <link:label id="lab_dec_BorrowingsCovenantBorrowingBaseAvailabilityPercent_label_en-US" xlink:label="lab_dec_BorrowingsCovenantBorrowingBaseAvailabilityPercent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Borrowing Base Availability, Percent</link:label>
    <link:label id="lab_dec_BorrowingsCovenantBorrowingBaseAvailabilityPercent_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantBorrowingBaseAvailabilityPercent" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings Covenant, Borrowing Base Availability, Percent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantBorrowingBaseAvailabilityPercent" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantBorrowingBaseAvailabilityPercent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantBorrowingBaseAvailabilityPercent" xlink:to="lab_dec_BorrowingsCovenantBorrowingBaseAvailabilityPercent" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSXNotesClassA2Member_7ec14e9b-e236-43ed-b68a-23f7d4a91cee_terseLabel_en-US" xlink:label="lab_dec_ABSXNotesClassA2Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS X Notes, Class A-2</link:label>
    <link:label id="lab_dec_ABSXNotesClassA2Member_label_en-US" xlink:label="lab_dec_ABSXNotesClassA2Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS X Notes, Class A-2 [Member]</link:label>
    <link:label id="lab_dec_ABSXNotesClassA2Member_documentation_en-US" xlink:label="lab_dec_ABSXNotesClassA2Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS X Notes, Class A-2</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSXNotesClassA2Member" xlink:href="dec-20250630.xsd#dec_ABSXNotesClassA2Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSXNotesClassA2Member" xlink:to="lab_dec_ABSXNotesClassA2Member" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_FairValueAndFinancialInstrumentsAbstract_label_en-US" xlink:label="lab_dec_FairValueAndFinancialInstrumentsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value and Financial Instruments [Abstract]</link:label>
    <link:label id="lab_dec_FairValueAndFinancialInstrumentsAbstract_documentation_en-US" xlink:label="lab_dec_FairValueAndFinancialInstrumentsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair Value and Financial Instruments [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_FairValueAndFinancialInstrumentsAbstract" xlink:href="dec-20250630.xsd#dec_FairValueAndFinancialInstrumentsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_FairValueAndFinancialInstrumentsAbstract" xlink:to="lab_dec_FairValueAndFinancialInstrumentsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSWarehouseFacilityMember_d299d038-1fb0-467d-9fda-03b25ec74caf_terseLabel_en-US" xlink:label="lab_dec_ABSWarehouseFacilityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS Warehouse Facility</link:label>
    <link:label id="lab_dec_ABSWarehouseFacilityMember_label_en-US" xlink:label="lab_dec_ABSWarehouseFacilityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS Warehouse Facility [Member]</link:label>
    <link:label id="lab_dec_ABSWarehouseFacilityMember_documentation_en-US" xlink:label="lab_dec_ABSWarehouseFacilityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS Warehouse Facility</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSWarehouseFacilityMember" xlink:href="dec-20250630.xsd#dec_ABSWarehouseFacilityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSWarehouseFacilityMember" xlink:to="lab_dec_ABSWarehouseFacilityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CovenantTwoMember_7f66b624-cd1b-4895-badc-1ec294047a5f_terseLabel_en-US" xlink:label="lab_dec_CovenantTwoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Covenant Two</link:label>
    <link:label id="lab_dec_CovenantTwoMember_label_en-US" xlink:label="lab_dec_CovenantTwoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Covenant Two [Member]</link:label>
    <link:label id="lab_dec_CovenantTwoMember_documentation_en-US" xlink:label="lab_dec_CovenantTwoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Covenant Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CovenantTwoMember" xlink:href="dec-20250630.xsd#dec_CovenantTwoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CovenantTwoMember" xlink:to="lab_dec_CovenantTwoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable_591c76c9-5740-42e5-9552-2106d6cc90b0_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable" xlink:to="lab_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_GroupAndOaktreeMember_c0fc60a3-b3fd-48c9-b8ed-f57f49a327a0_terseLabel_en-US" xlink:label="lab_dec_GroupAndOaktreeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Group and Oaktree</link:label>
    <link:label id="lab_dec_GroupAndOaktreeMember_label_en-US" xlink:label="lab_dec_GroupAndOaktreeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Group And Oaktree [Member]</link:label>
    <link:label id="lab_dec_GroupAndOaktreeMember_documentation_en-US" xlink:label="lab_dec_GroupAndOaktreeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Group And Oaktree</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_GroupAndOaktreeMember" xlink:href="dec-20250630.xsd#dec_GroupAndOaktreeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_GroupAndOaktreeMember" xlink:to="lab_dec_GroupAndOaktreeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets_aa906ae0-52ac-4fce-ab3e-86959c6d7bbe_terseLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment, net</link:label>
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    <link:label id="lab_dec_DerivativeAssetOrLiabilitySubjectToMasterNettingArrangementBeforeOffsetAbstract_681c1ec7-3b96-419d-b4fd-a4f4f0439f33_terseLabel_en-US" xlink:label="lab_dec_DerivativeAssetOrLiabilitySubjectToMasterNettingArrangementBeforeOffsetAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Presented without Effects of Netting</link:label>
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    <link:label id="lab_dec_DerivativeAssetOrLiabilitySubjectToMasterNettingArrangementBeforeOffsetAbstract_documentation_en-US" xlink:label="lab_dec_DerivativeAssetOrLiabilitySubjectToMasterNettingArrangementBeforeOffsetAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Asset Or Liability, Subject to Master Netting Arrangement, Before Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeAssetOrLiabilitySubjectToMasterNettingArrangementBeforeOffsetAbstract" xlink:href="dec-20250630.xsd#dec_DerivativeAssetOrLiabilitySubjectToMasterNettingArrangementBeforeOffsetAbstract"/>
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    <link:label id="lab_dei_DocumentPeriodEndDate_4274f9f6-66b2-403d-9b51-241cd3f6f5ba_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
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    <link:label id="lab_dec_GainsLossesOnSettledDerivatives_89be0639-3b89-4fa9-a999-63f4ab03f55c_terseLabel_en-US" xlink:label="lab_dec_GainsLossesOnSettledDerivatives" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total gain (loss) on settled derivative instruments</link:label>
    <link:label id="lab_dec_GainsLossesOnSettledDerivatives_label_en-US" xlink:label="lab_dec_GainsLossesOnSettledDerivatives" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gains (Losses) On Settled Derivatives</link:label>
    <link:label id="lab_dec_GainsLossesOnSettledDerivatives_documentation_en-US" xlink:label="lab_dec_GainsLossesOnSettledDerivatives" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Gains (Losses) On Settled Derivatives</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_GainsLossesOnSettledDerivatives" xlink:href="dec-20250630.xsd#dec_GainsLossesOnSettledDerivatives"/>
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    <link:label id="lab_ifrs-full_CurrentTaxExpenseIncome_688050ee-5eb8-4c3b-afc7-ee7e665fda35_totalLabel_en-US" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current income tax (benefit) expense</link:label>
    <link:label id="lab_ifrs-full_CurrentTaxExpenseIncome_label_en-US" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current tax expense (income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxExpenseIncome" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentTaxExpenseIncome"/>
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    <link:label id="lab_dec_IncomeTaxAbstract_label_en-US" xlink:label="lab_dec_IncomeTaxAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax [Abstract]</link:label>
    <link:label id="lab_dec_IncomeTaxAbstract_documentation_en-US" xlink:label="lab_dec_IncomeTaxAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Income Tax [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_IncomeTaxAbstract" xlink:href="dec-20250630.xsd#dec_IncomeTaxAbstract"/>
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    <link:label id="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_b9ad9eb8-e062-4c21-a60d-92b23f2aef54_terseLabel_en-US" xlink:label="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-adjusting events after reporting period [axis]</link:label>
    <link:label id="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_label_en-US" xlink:label="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-adjusting events after reporting period [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:to="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_2e640e1f-d663-4ecf-b07e-60a8a946020b_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Later than one year and not later than five years</link:label>
    <link:label id="lab_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Later than one year and not later than five years [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:to="lab_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_06a3df79-30a1-43cc-a899-983ba7f6250e_terseLabel_en-US" xlink:label="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-adjusting events after reporting period [domain]</link:label>
    <link:label id="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_label_en-US" xlink:label="lab_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-adjusting events after reporting period [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
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    <link:label id="lab_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_f231de89-5df7-40af-892e-a213a7aa654f_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of classes of share capital [line items]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
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    <link:label id="lab_ifrs-full_MaturityAxis_b049c1bb-c8b7-4747-b665-37e8d0417cf9_terseLabel_en-US" xlink:label="lab_ifrs-full_MaturityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturity [axis]</link:label>
    <link:label id="lab_ifrs-full_MaturityAxis_label_en-US" xlink:label="lab_ifrs-full_MaturityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maturity [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MaturityAxis" xlink:to="lab_ifrs-full_MaturityAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TopOfRangeMember_e15d1ef9-bbc1-4c34-a3f6-447527024105_terseLabel_en-US" xlink:label="lab_ifrs-full_TopOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Top of range</link:label>
    <link:label id="lab_ifrs-full_TopOfRangeMember_label_en-US" xlink:label="lab_ifrs-full_TopOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Top of range [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TopOfRangeMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember"/>
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    <link:label id="lab_dec_DerivativeAssetLiabilityBeforeOffset_330148f3-fef1-470e-b498-e4a43635d038_totalLabel_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total net assets (liabilities)</link:label>
    <link:label id="lab_dec_DerivativeAssetLiabilityBeforeOffset_label_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset (Liability), Before Offset</link:label>
    <link:label id="lab_dec_DerivativeAssetLiabilityBeforeOffset_documentation_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Asset (Liability), Before Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeAssetLiabilityBeforeOffset" xlink:href="dec-20250630.xsd#dec_DerivativeAssetLiabilityBeforeOffset"/>
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    <link:label id="lab_ifrs-full_ClassesOfFinancialInstrumentsAxis_a6f08307-a4cf-4b12-bab0-f3698b8109f2_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialInstrumentsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of financial instruments [axis]</link:label>
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    <link:label id="lab_dec_WriteOffOfFinanceCosts_25178078-908b-4edd-ba2f-b62cf33587d6_terseLabel_en-US" xlink:label="lab_dec_WriteOffOfFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Write-off of finance costs</link:label>
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    <link:label id="lab_dec_WriteOffOfFinanceCosts_documentation_en-US" xlink:label="lab_dec_WriteOffOfFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Write-Off Of Finance Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_WriteOffOfFinanceCosts" xlink:href="dec-20250630.xsd#dec_WriteOffOfFinanceCosts"/>
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    <link:label id="lab_srt_StatementScenarioAxis_646ba6c5-2ad6-49b8-8c52-ce8091d5c049_terseLabel_en-US" xlink:label="lab_srt_StatementScenarioAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Scenario [Axis]</link:label>
    <link:label id="lab_srt_StatementScenarioAxis_label_en-US" xlink:label="lab_srt_StatementScenarioAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Scenario [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_StatementScenarioAxis" xlink:to="lab_srt_StatementScenarioAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherNoncurrentAssets_66a0ea2c-1b88-42f0-9c94-e4c50fc2b6bc_verboseLabel_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other non-current assets</link:label>
    <link:label id="lab_ifrs-full_OtherNoncurrentAssets_label_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other non-current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherNoncurrentAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherNoncurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherNoncurrentAssets" xlink:to="lab_ifrs-full_OtherNoncurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CurrentStateAndLocalTaxExpenseIncome_876f619d-d783-4529-aaad-72b98242763d_terseLabel_en-US" xlink:label="lab_dec_CurrentStateAndLocalTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">State (benefit) expense</link:label>
    <link:label id="lab_dec_CurrentStateAndLocalTaxExpenseIncome_label_en-US" xlink:label="lab_dec_CurrentStateAndLocalTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current State And Local Tax Expense (Income)</link:label>
    <link:label id="lab_dec_CurrentStateAndLocalTaxExpenseIncome_documentation_en-US" xlink:label="lab_dec_CurrentStateAndLocalTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Current State And Local Tax Expense (Income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CurrentStateAndLocalTaxExpenseIncome" xlink:href="dec-20250630.xsd#dec_CurrentStateAndLocalTaxExpenseIncome"/>
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    <link:label id="lab_dec_AssetAcquisitionAssetRetirementObligations_68ea2ff7-65fe-4e81-ab60-cdca3f5c87d9_terseLabel_en-US" xlink:label="lab_dec_AssetAcquisitionAssetRetirementObligations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset retirement obligations, asset portion</link:label>
    <link:label id="lab_dec_AssetAcquisitionAssetRetirementObligations_label_en-US" xlink:label="lab_dec_AssetAcquisitionAssetRetirementObligations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Asset Retirement Obligations</link:label>
    <link:label id="lab_dec_AssetAcquisitionAssetRetirementObligations_documentation_en-US" xlink:label="lab_dec_AssetAcquisitionAssetRetirementObligations" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Asset Retirement Obligations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetAcquisitionAssetRetirementObligations" xlink:href="dec-20250630.xsd#dec_AssetAcquisitionAssetRetirementObligations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AssetAcquisitionAssetRetirementObligations" xlink:to="lab_dec_AssetAcquisitionAssetRetirementObligations" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CommodityContract1Member_06d43870-ef79-46d4-afbe-e55c0bdf087a_verboseLabel_en-US" xlink:label="lab_dec_CommodityContract1Member" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Commodity derivatives settlements</link:label>
    <link:label id="lab_dec_CommodityContract1Member_7412c44e-3254-4c54-a59a-c79191899813_terseLabel_en-US" xlink:label="lab_dec_CommodityContract1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commodity derivatives</link:label>
    <link:label id="lab_dec_CommodityContract1Member_label_en-US" xlink:label="lab_dec_CommodityContract1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commodity Contract1 [Member]</link:label>
    <link:label id="lab_dec_CommodityContract1Member_documentation_en-US" xlink:label="lab_dec_CommodityContract1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Commodity Contract1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CommodityContract1Member" xlink:href="dec-20250630.xsd#dec_CommodityContract1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CommodityContract1Member" xlink:to="lab_dec_CommodityContract1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSVIIINotesClassA2Member_ef65c47d-c7cf-49a9-8a1a-f9a448e77454_terseLabel_en-US" xlink:label="lab_dec_ABSVIIINotesClassA2Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS VIII Notes, Class A-2</link:label>
    <link:label id="lab_dec_ABSVIIINotesClassA2Member_label_en-US" xlink:label="lab_dec_ABSVIIINotesClassA2Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS VIII Notes, Class A-2 [Member]</link:label>
    <link:label id="lab_dec_ABSVIIINotesClassA2Member_documentation_en-US" xlink:label="lab_dec_ABSVIIINotesClassA2Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS VIII Notes, Class A-2</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSVIIINotesClassA2Member" xlink:href="dec-20250630.xsd#dec_ABSVIIINotesClassA2Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSVIIINotesClassA2Member" xlink:to="lab_dec_ABSVIIINotesClassA2Member" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentType_78d83e81-82d1-4732-8a25-5caaad2bcec1_terseLabel_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:label id="lab_dei_DocumentType_label_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentType" xlink:to="lab_dei_DocumentType" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSVIIINotesMember_e9b0d712-ca4e-4a1c-9730-3876acc2e368_terseLabel_en-US" xlink:label="lab_dec_ABSVIIINotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS VIII Notes</link:label>
    <link:label id="lab_dec_ABSVIIINotesMember_label_en-US" xlink:label="lab_dec_ABSVIIINotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS VIII Notes [Member]</link:label>
    <link:label id="lab_dec_ABSVIIINotesMember_documentation_en-US" xlink:label="lab_dec_ABSVIIINotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS VIII Notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSVIIINotesMember" xlink:href="dec-20250630.xsd#dec_ABSVIIINotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSVIIINotesMember" xlink:to="lab_dec_ABSVIIINotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantDerivativeInstrumentPeriod_8bbed996-9437-487f-bdc5-ac1e357aefd8_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantDerivativeInstrumentPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Hedging agreement, period</link:label>
    <link:label id="lab_dec_BorrowingsCovenantDerivativeInstrumentPeriod_label_en-US" xlink:label="lab_dec_BorrowingsCovenantDerivativeInstrumentPeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Derivative Instrument, Period</link:label>
    <link:label id="lab_dec_BorrowingsCovenantDerivativeInstrumentPeriod_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantDerivativeInstrumentPeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Derivative Instrument, Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantDerivativeInstrumentPeriod" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantDerivativeInstrumentPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantDerivativeInstrumentPeriod" xlink:to="lab_dec_BorrowingsCovenantDerivativeInstrumentPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSVINoteMember_15096242-880b-4d77-84ef-4c727ad55084_terseLabel_en-US" xlink:label="lab_dec_ABSVINoteMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS VI Notes</link:label>
    <link:label id="lab_dec_ABSVINoteMember_label_en-US" xlink:label="lab_dec_ABSVINoteMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS VI Note [Member]</link:label>
    <link:label id="lab_dec_ABSVINoteMember_documentation_en-US" xlink:label="lab_dec_ABSVINoteMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS VI Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSVINoteMember" xlink:href="dec-20250630.xsd#dec_ABSVINoteMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSVINoteMember" xlink:to="lab_dec_ABSVINoteMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_ProductOrServiceAxis_9c53726d-ddc4-426d-ba0b-795adc77eba5_terseLabel_en-US" xlink:label="lab_srt_ProductOrServiceAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Product and Service [Axis]</link:label>
    <link:label id="lab_srt_ProductOrServiceAxis_label_en-US" xlink:label="lab_srt_ProductOrServiceAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product and Service [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ProductOrServiceAxis" xlink:to="lab_srt_ProductOrServiceAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfFinancialAssetsAxis_609b25a0-fc23-4df6-bf61-a390e2c81777_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of financial assets [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfFinancialAssetsAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of financial assets [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:to="lab_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OtherAssetsNoncurrentMember_3a76d959-5047-49ee-b92b-cf4a19795e87_terseLabel_en-US" xlink:label="lab_dec_OtherAssetsNoncurrentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other non-current assets</link:label>
    <link:label id="lab_dec_OtherAssetsNoncurrentMember_label_en-US" xlink:label="lab_dec_OtherAssetsNoncurrentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Noncurrent [Member]</link:label>
    <link:label id="lab_dec_OtherAssetsNoncurrentMember_documentation_en-US" xlink:label="lab_dec_OtherAssetsNoncurrentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Assets, Noncurrent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherAssetsNoncurrentMember" xlink:href="dec-20250630.xsd#dec_OtherAssetsNoncurrentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OtherAssetsNoncurrentMember" xlink:to="lab_dec_OtherAssetsNoncurrentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSVIClassBNoteMember_9a79e898-c26b-464c-9871-990662f7b1f0_terseLabel_en-US" xlink:label="lab_dec_ABSVIClassBNoteMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS VII Class B Notes</link:label>
    <link:label id="lab_dec_ABSVIClassBNoteMember_label_en-US" xlink:label="lab_dec_ABSVIClassBNoteMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS VI Class B Note [Member]</link:label>
    <link:label id="lab_dec_ABSVIClassBNoteMember_documentation_en-US" xlink:label="lab_dec_ABSVIClassBNoteMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS VII Class B Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSVIClassBNoteMember" xlink:href="dec-20250630.xsd#dec_ABSVIClassBNoteMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSVIClassBNoteMember" xlink:to="lab_dec_ABSVIClassBNoteMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories_aede1969-0bf1-4804-95f2-4d8b50bb4dde_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventory</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for measuring inventories [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_SummaryOfDividendsDeclaredAndPaidTableTextBlock_04860f12-a016-498f-8daf-995da34e7bf8_terseLabel_en-US" xlink:label="lab_dec_SummaryOfDividendsDeclaredAndPaidTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of dividends declared and paid</link:label>
    <link:label id="lab_dec_SummaryOfDividendsDeclaredAndPaidTableTextBlock_label_en-US" xlink:label="lab_dec_SummaryOfDividendsDeclaredAndPaidTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Summary Of Dividends Declared And Paid [Table Text Block]</link:label>
    <link:label id="lab_dec_SummaryOfDividendsDeclaredAndPaidTableTextBlock_documentation_en-US" xlink:label="lab_dec_SummaryOfDividendsDeclaredAndPaidTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Summary Of Dividends Declared And Paid</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_SummaryOfDividendsDeclaredAndPaidTableTextBlock" xlink:href="dec-20250630.xsd#dec_SummaryOfDividendsDeclaredAndPaidTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_SummaryOfDividendsDeclaredAndPaidTableTextBlock" xlink:to="lab_dec_SummaryOfDividendsDeclaredAndPaidTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncomeStatementAbstract_label_en-US" xlink:label="lab_ifrs-full_IncomeStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit or loss [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeStatementAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeStatementAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncomeStatementAbstract" xlink:to="lab_ifrs-full_IncomeStatementAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ScheduleOfDisaggregationOfRevenueTableTextBlock_27855242-f601-4772-ada4-3a45dfcb42f5_terseLabel_en-US" xlink:label="lab_dec_ScheduleOfDisaggregationOfRevenueTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of disaggregation of revenue</link:label>
    <link:label id="lab_dec_ScheduleOfDisaggregationOfRevenueTableTextBlock_label_en-US" xlink:label="lab_dec_ScheduleOfDisaggregationOfRevenueTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Disaggregation Of Revenue [Table Text Block]</link:label>
    <link:label id="lab_dec_ScheduleOfDisaggregationOfRevenueTableTextBlock_documentation_en-US" xlink:label="lab_dec_ScheduleOfDisaggregationOfRevenueTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule Of Disaggregation Of Revenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ScheduleOfDisaggregationOfRevenueTableTextBlock" xlink:href="dec-20250630.xsd#dec_ScheduleOfDisaggregationOfRevenueTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ScheduleOfDisaggregationOfRevenueTableTextBlock" xlink:to="lab_dec_ScheduleOfDisaggregationOfRevenueTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_PrincipalInstallmentDueDateDomain_df13834a-4d88-496b-86c9-c10788ab16ee_terseLabel_en-US" xlink:label="lab_dec_PrincipalInstallmentDueDateDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Principal Installment Due Date [Domain]</link:label>
    <link:label id="lab_dec_PrincipalInstallmentDueDateDomain_label_en-US" xlink:label="lab_dec_PrincipalInstallmentDueDateDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Principal Installment Due Date [Domain]</link:label>
    <link:label id="lab_dec_PrincipalInstallmentDueDateDomain_documentation_en-US" xlink:label="lab_dec_PrincipalInstallmentDueDateDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Principal Installment Due Date [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_PrincipalInstallmentDueDateDomain" xlink:href="dec-20250630.xsd#dec_PrincipalInstallmentDueDateDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_PrincipalInstallmentDueDateDomain" xlink:to="lab_dec_PrincipalInstallmentDueDateDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_AggregateRemunerationIncludingDirectorsAbstract_b5b68fe7-0439-44e1-8d8b-1166edb6814e_terseLabel_en-US" xlink:label="lab_dec_AggregateRemunerationIncludingDirectorsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate remuneration (including Directors):</link:label>
    <link:label id="lab_dec_AggregateRemunerationIncludingDirectorsAbstract_label_en-US" xlink:label="lab_dec_AggregateRemunerationIncludingDirectorsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Aggregate remuneration (including Directors): [Abstract]</link:label>
    <link:label id="lab_dec_AggregateRemunerationIncludingDirectorsAbstract_documentation_en-US" xlink:label="lab_dec_AggregateRemunerationIncludingDirectorsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Aggregate remuneration (including Directors):</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AggregateRemunerationIncludingDirectorsAbstract" xlink:href="dec-20250630.xsd#dec_AggregateRemunerationIncludingDirectorsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AggregateRemunerationIncludingDirectorsAbstract" xlink:to="lab_dec_AggregateRemunerationIncludingDirectorsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForOilAndGasAssetsExplanatory_066ffd52-fb24-44f3-a1fe-4f1a508ebd77_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForOilAndGasAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Natural Gas and Oil Properties</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForOilAndGasAssetsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForOilAndGasAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for oil and gas assets [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForOilAndGasAssetsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForOilAndGasAssetsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForOilAndGasAssetsExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForOilAndGasAssetsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RevenueOfCombinedEntity_df6946fd-72b9-4c37-b5b0-90bd6f0b6990_terseLabel_en-US" xlink:label="lab_ifrs-full_RevenueOfCombinedEntity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue of combined entity as if combination occurred at beginning of period</link:label>
    <link:label id="lab_ifrs-full_RevenueOfCombinedEntity_label_en-US" xlink:label="lab_ifrs-full_RevenueOfCombinedEntity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue of combined entity as if combination occurred at beginning of period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueOfCombinedEntity" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueOfCombinedEntity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RevenueOfCombinedEntity" xlink:to="lab_ifrs-full_RevenueOfCombinedEntity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_a16b0253-8306-4573-b4d9-b9b78f05e3f6_terseLabel_en-US" xlink:label="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]</link:label>
    <link:label id="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_label_en-US" xlink:label="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:to="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OtherLiabilitiesNoncurrentMember_8327f670-3974-40dd-b03f-f2b6b9c7181d_terseLabel_en-US" xlink:label="lab_dec_OtherLiabilitiesNoncurrentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other non-current liabilities</link:label>
    <link:label id="lab_dec_OtherLiabilitiesNoncurrentMember_label_en-US" xlink:label="lab_dec_OtherLiabilitiesNoncurrentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities, Noncurrent [Member]</link:label>
    <link:label id="lab_dec_OtherLiabilitiesNoncurrentMember_documentation_en-US" xlink:label="lab_dec_OtherLiabilitiesNoncurrentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Liabilities, Noncurrent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherLiabilitiesNoncurrentMember" xlink:href="dec-20250630.xsd#dec_OtherLiabilitiesNoncurrentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OtherLiabilitiesNoncurrentMember" xlink:to="lab_dec_OtherLiabilitiesNoncurrentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfAssetsAxis_501f87fd-db2e-4a0f-be41-ca43650c7c65_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of assets [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfAssetsAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of assets [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis" xlink:to="lab_ifrs-full_ClassesOfAssetsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BorrowingsByNameDomain_4ca05b5e-4154-4f27-aa53-9e657996fcc3_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings by name [domain]</link:label>
    <link:label id="lab_ifrs-full_BorrowingsByNameDomain_label_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings by name [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BorrowingsByNameDomain" xlink:to="lab_ifrs-full_BorrowingsByNameDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_TermLoanIIMember_615efbf6-80b9-409c-8122-fa8fc6afc362_terseLabel_en-US" xlink:label="lab_dec_TermLoanIIMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term Loan II</link:label>
    <link:label id="lab_dec_TermLoanIIMember_label_en-US" xlink:label="lab_dec_TermLoanIIMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Term Loan II [Member]</link:label>
    <link:label id="lab_dec_TermLoanIIMember_documentation_en-US" xlink:label="lab_dec_TermLoanIIMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Term Loan II</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_TermLoanIIMember" xlink:href="dec-20250630.xsd#dec_TermLoanIIMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_TermLoanIIMember" xlink:to="lab_dec_TermLoanIIMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RevenueOfAcquiree_161d9d56-84b5-421d-b5de-e543f1b6424b_terseLabel_en-US" xlink:label="lab_ifrs-full_RevenueOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue of acquiree since acquisition date</link:label>
    <link:label id="lab_ifrs-full_RevenueOfAcquiree_label_en-US" xlink:label="lab_ifrs-full_RevenueOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue of acquiree since acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueOfAcquiree" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueOfAcquiree"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RevenueOfAcquiree" xlink:to="lab_ifrs-full_RevenueOfAcquiree" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_e869997b-1198-4abd-bfdb-decd58de09c3_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Types of share-based payment arrangements</link:label>
    <link:label id="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_label_en-US" xlink:label="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Types of share-based payment arrangements [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:to="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeReceivablesMember_b78f7db8-179e-440b-bde8-3f32b4e1fa59_terseLabel_en-US" xlink:label="lab_ifrs-full_TradeReceivablesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade receivables, net</link:label>
    <link:label id="lab_ifrs-full_TradeReceivablesMember_label_en-US" xlink:label="lab_ifrs-full_TradeReceivablesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade receivables [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeReceivablesMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeReceivablesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeReceivablesMember" xlink:to="lab_ifrs-full_TradeReceivablesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParent_4b25e76a-fae8-40f5-912f-599003f1f860_totalLabel_en-US" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Equity attributable to owners of the parent</link:label>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParent_label_en-US" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity attributable to owners of parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent" xlink:to="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EarningsPerShareAbstract_b9019f60-dac8-495f-b45e-98bc7b2b1f82_terseLabel_en-US" xlink:label="lab_ifrs-full_EarningsPerShareAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings (loss) per share attributable to owners of Diversified Energy Company PLC</link:label>
    <link:label id="lab_ifrs-full_EarningsPerShareAbstract_label_en-US" xlink:label="lab_ifrs-full_EarningsPerShareAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings per share [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EarningsPerShareAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EarningsPerShareAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EarningsPerShareAbstract" xlink:to="lab_ifrs-full_EarningsPerShareAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RangeAxis_3f41f0ba-f468-4d4c-a04a-36ec15438588_terseLabel_en-US" xlink:label="lab_ifrs-full_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Range [axis]</link:label>
    <link:label id="lab_ifrs-full_RangeAxis_label_en-US" xlink:label="lab_ifrs-full_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RangeAxis" xlink:to="lab_ifrs-full_RangeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_IssuedSharePrice_529a76bf-2f76-4aeb-a74a-932997381782_terseLabel_en-US" xlink:label="lab_dec_IssuedSharePrice" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Issued share price (US dollars per share)</link:label>
    <link:label id="lab_dec_IssuedSharePrice_label_en-US" xlink:label="lab_dec_IssuedSharePrice" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Issued Share Price</link:label>
    <link:label id="lab_dec_IssuedSharePrice_documentation_en-US" xlink:label="lab_dec_IssuedSharePrice" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Issued Share Price</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_IssuedSharePrice" xlink:href="dec-20250630.xsd#dec_IssuedSharePrice"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_IssuedSharePrice" xlink:to="lab_dec_IssuedSharePrice" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComponentsOfEquityAxis_fc668718-1689-4a79-9c04-58571eafe8b0_terseLabel_en-US" xlink:label="lab_ifrs-full_ComponentsOfEquityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of equity [axis]</link:label>
    <link:label id="lab_ifrs-full_ComponentsOfEquityAxis_label_en-US" xlink:label="lab_ifrs-full_ComponentsOfEquityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Components of equity [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis" xlink:to="lab_ifrs-full_ComponentsOfEquityAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FixedInterestRateMember_b300720f-f6b1-45be-90cb-e39a18304a60_terseLabel_en-US" xlink:label="lab_ifrs-full_FixedInterestRateMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed interest rate</link:label>
    <link:label id="lab_ifrs-full_FixedInterestRateMember_label_en-US" xlink:label="lab_ifrs-full_FixedInterestRateMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fixed interest rate [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FixedInterestRateMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FixedInterestRateMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FixedInterestRateMember" xlink:to="lab_ifrs-full_FixedInterestRateMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DecommissioningRestorationAndRehabilitationCostsAssetRecognizedAsOfAcquisitionDate_cea5dede-1e29-4eb3-bb60-00e209802042_terseLabel_en-US" xlink:label="lab_dec_DecommissioningRestorationAndRehabilitationCostsAssetRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset retirement obligations, asset portion</link:label>
    <link:label id="lab_dec_DecommissioningRestorationAndRehabilitationCostsAssetRecognizedAsOfAcquisitionDate_label_en-US" xlink:label="lab_dec_DecommissioningRestorationAndRehabilitationCostsAssetRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Decommissioning, Restoration, And Rehabilitation Costs, Asset, Recognized As Of Acquisition Date,</link:label>
    <link:label id="lab_dec_DecommissioningRestorationAndRehabilitationCostsAssetRecognizedAsOfAcquisitionDate_documentation_en-US" xlink:label="lab_dec_DecommissioningRestorationAndRehabilitationCostsAssetRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Decommissioning, Restoration, And Rehabilitation Costs, Asset, Recognized As Of Acquisition Date,</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DecommissioningRestorationAndRehabilitationCostsAssetRecognizedAsOfAcquisitionDate" xlink:href="dec-20250630.xsd#dec_DecommissioningRestorationAndRehabilitationCostsAssetRecognizedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DecommissioningRestorationAndRehabilitationCostsAssetRecognizedAsOfAcquisitionDate" xlink:to="lab_dec_DecommissioningRestorationAndRehabilitationCostsAssetRecognizedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CovenantFiveMember_64efb67f-9398-494d-bfeb-79fcfc17dd0f_terseLabel_en-US" xlink:label="lab_dec_CovenantFiveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Covenant Five</link:label>
    <link:label id="lab_dec_CovenantFiveMember_label_en-US" xlink:label="lab_dec_CovenantFiveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Covenant Five [Member]</link:label>
    <link:label id="lab_dec_CovenantFiveMember_documentation_en-US" xlink:label="lab_dec_CovenantFiveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Covenant Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CovenantFiveMember" xlink:href="dec-20250630.xsd#dec_CovenantFiveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CovenantFiveMember" xlink:to="lab_dec_CovenantFiveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_56c4a469-c4bc-4632-8e4e-17b8454d761e_totalLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Income (loss) before taxation</link:label>
    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_acf44e95-3405-42bd-a2ff-a3b7ef96cd46_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income (loss) before taxation</link:label>
    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_label_en-US" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit (loss) before tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossBeforeTax" xlink:to="lab_ifrs-full_ProfitLossBeforeTax" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantAnyPaymentDateOnOrAfterExcessAllocationStartingDatePercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal_f90a4d8d-967b-4c43-b0c8-b784999d9208_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantAnyPaymentDateOnOrAfterExcessAllocationStartingDatePercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings, covenant, any payment date on or after excess allocation starting date, percentage of excess cash flows that must be paid towards additional principal</link:label>
    <link:label id="lab_dec_BorrowingsCovenantAnyPaymentDateOnOrAfterExcessAllocationStartingDatePercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal_label_en-US" xlink:label="lab_dec_BorrowingsCovenantAnyPaymentDateOnOrAfterExcessAllocationStartingDatePercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Any Payment Date On Or After Excess Allocation Starting Date, Percentage Of Excess Cash Flows That must Be Paid Towards Additional Principal</link:label>
    <link:label id="lab_dec_BorrowingsCovenantAnyPaymentDateOnOrAfterExcessAllocationStartingDatePercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantAnyPaymentDateOnOrAfterExcessAllocationStartingDatePercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, Any Payment Date On Or After Excess Allocation Starting Date, Percentage Of Excess Cash Flows That must Be Paid Towards Additional Principal</link:label>
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    <link:label id="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_20acee73-bb3f-422c-b8a3-65eb2a1ab125_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Types of share-based payment arrangements [axis]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory_4a71f77a-2dc7-4880-8690-5f2d726f72cf_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share Capital</link:label>
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    <link:label id="lab_srt_ScenarioForecastMember_e923a261-bbec-4d58-9c68-750544bbb26b_terseLabel_en-US" xlink:label="lab_srt_ScenarioForecastMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forecast</link:label>
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    <link:label id="lab_ifrs-full_InterestExpenseOnBorrowings_20a4b609-9706-47e8-a987-f67488c0b5b6_verboseLabel_en-US" xlink:label="lab_ifrs-full_InterestExpenseOnBorrowings" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Interest expense, net of capitalized and income amounts</link:label>
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    <link:label id="lab_ifrs-full_EquityInterestsOfAcquirer_a6dd692a-52c4-4a2c-9007-7b40b80a124a_terseLabel_en-US" xlink:label="lab_ifrs-full_EquityInterestsOfAcquirer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity interests of acquirer</link:label>
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    <link:label id="lab_dec_SplendidLandLLCMember_21fa9037-2e27-4ca3-840f-f1f9022741ea_terseLabel_en-US" xlink:label="lab_dec_SplendidLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Splendid Land LLC</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfFinancialInstrumentsDomain_3c42be2e-1423-443e-bed6-1400a7ce03eb_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialInstrumentsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of financial instruments [domain]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfFinancialInstrumentsDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialInstrumentsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of financial instruments [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain" xlink:to="lab_ifrs-full_ClassesOfFinancialInstrumentsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSNotesIIIAndVMember_a0153c51-5a5a-49b1-bbad-317846f41e9d_terseLabel_en-US" xlink:label="lab_dec_ABSNotesIIIAndVMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS Notes III And V</link:label>
    <link:label id="lab_dec_ABSNotesIIIAndVMember_label_en-US" xlink:label="lab_dec_ABSNotesIIIAndVMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS Notes III And V [Member]</link:label>
    <link:label id="lab_dec_ABSNotesIIIAndVMember_documentation_en-US" xlink:label="lab_dec_ABSNotesIIIAndVMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS Notes III And V</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSNotesIIIAndVMember" xlink:href="dec-20250630.xsd#dec_ABSNotesIIIAndVMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSNotesIIIAndVMember" xlink:to="lab_dec_ABSNotesIIIAndVMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfBusinessCombinationsTable_d188c29e-94e0-4679-be88-f60f326b56d7_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about business combination [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfBusinessCombinationsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about business combination [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:to="lab_ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime_d16c4cce-b57f-4fba-9bf7-531186717f70_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Accretion of asset retirement obligation</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime_7b568bdb-d98d-40c9-a35a-a62b22627faa_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accretion of asset retirement obligations</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for increase in other provisions arising from passage of time</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime" xlink:to="lab_ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_LinkLandLLCMember_95abf8de-3d5a-49d4-8a3f-951c8a11de91_terseLabel_en-US" xlink:label="lab_dec_LinkLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Link Land LLC</link:label>
    <link:label id="lab_dec_LinkLandLLCMember_label_en-US" xlink:label="lab_dec_LinkLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Link Land LLC [Member]</link:label>
    <link:label id="lab_dec_LinkLandLLCMember_documentation_en-US" xlink:label="lab_dec_LinkLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Link Land LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_LinkLandLLCMember" xlink:href="dec-20250630.xsd#dec_LinkLandLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_LinkLandLLCMember" xlink:to="lab_dec_LinkLandLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_MiscellaneousBorrowingsMember_d0ee23f3-4375-4d6b-8d01-5d91e75b0784_terseLabel_en-US" xlink:label="lab_dec_MiscellaneousBorrowingsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other miscellaneous borrowings</link:label>
    <link:label id="lab_dec_MiscellaneousBorrowingsMember_label_en-US" xlink:label="lab_dec_MiscellaneousBorrowingsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Miscellaneous Borrowings [Member]</link:label>
    <link:label id="lab_dec_MiscellaneousBorrowingsMember_documentation_en-US" xlink:label="lab_dec_MiscellaneousBorrowingsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Miscellaneous Borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_MiscellaneousBorrowingsMember" xlink:href="dec-20250630.xsd#dec_MiscellaneousBorrowingsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_MiscellaneousBorrowingsMember" xlink:to="lab_dec_MiscellaneousBorrowingsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSVNoteMember_e47e8c98-0418-4599-8459-cba645d74823_terseLabel_en-US" xlink:label="lab_dec_ABSVNoteMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS V Notes</link:label>
    <link:label id="lab_dec_ABSVNoteMember_label_en-US" xlink:label="lab_dec_ABSVNoteMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS V Note [Member]</link:label>
    <link:label id="lab_dec_ABSVNoteMember_documentation_en-US" xlink:label="lab_dec_ABSVNoteMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS V Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSVNoteMember" xlink:href="dec-20250630.xsd#dec_ABSVNoteMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSVNoteMember" xlink:to="lab_dec_ABSVNoteMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeFinancialAssetsLiabilities_63c84db2-b1e7-4afa-a336-229af5be44c2_totalLabel_en-US" xlink:label="lab_dec_DerivativeFinancialAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Fair value, assets (liabilities), net</link:label>
    <link:label id="lab_dec_DerivativeFinancialAssetsLiabilities_label_en-US" xlink:label="lab_dec_DerivativeFinancialAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Financial Assets (Liabilities)</link:label>
    <link:label id="lab_dec_DerivativeFinancialAssetsLiabilities_documentation_en-US" xlink:label="lab_dec_DerivativeFinancialAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Financial Assets (Liabilities)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeFinancialAssetsLiabilities" xlink:href="dec-20250630.xsd#dec_DerivativeFinancialAssetsLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeFinancialAssetsLiabilities" xlink:to="lab_dec_DerivativeFinancialAssetsLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_be461178-365c-4e87-9c8c-2f0b435519a3_terseLabel_en-US" xlink:label="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Attribution of expenses by nature to their function [domain]</link:label>
    <link:label id="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_label_en-US" xlink:label="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Attribution of expenses by nature to their function [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:to="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CashRestrictedByAssetBackedSecuritizations_19ae8be8-9afb-4aaa-9ed8-b5e007001110_terseLabel_en-US" xlink:label="lab_dec_CashRestrictedByAssetBackedSecuritizations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash restricted by asset-backed securitizations</link:label>
    <link:label id="lab_dec_CashRestrictedByAssetBackedSecuritizations_label_en-US" xlink:label="lab_dec_CashRestrictedByAssetBackedSecuritizations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Restricted By Asset Backed Securitizations</link:label>
    <link:label id="lab_dec_CashRestrictedByAssetBackedSecuritizations_documentation_en-US" xlink:label="lab_dec_CashRestrictedByAssetBackedSecuritizations" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cash Restricted By Asset Backed Securitizations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CashRestrictedByAssetBackedSecuritizations" xlink:href="dec-20250630.xsd#dec_CashRestrictedByAssetBackedSecuritizations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CashRestrictedByAssetBackedSecuritizations" xlink:to="lab_dec_CashRestrictedByAssetBackedSecuritizations" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CurrentDerivativeLiabilityBeforeOffset_44b805ca-07af-4084-9851-1a71f7f47374_negatedTerseLabel_en-US" xlink:label="lab_dec_CurrentDerivativeLiabilityBeforeOffset" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Current liabilities</link:label>
    <link:label id="lab_dec_CurrentDerivativeLiabilityBeforeOffset_label_en-US" xlink:label="lab_dec_CurrentDerivativeLiabilityBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Derivative Liability, Before Offset</link:label>
    <link:label id="lab_dec_CurrentDerivativeLiabilityBeforeOffset_documentation_en-US" xlink:label="lab_dec_CurrentDerivativeLiabilityBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Current Derivative Liability, Before Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CurrentDerivativeLiabilityBeforeOffset" xlink:href="dec-20250630.xsd#dec_CurrentDerivativeLiabilityBeforeOffset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CurrentDerivativeLiabilityBeforeOffset" xlink:to="lab_dec_CurrentDerivativeLiabilityBeforeOffset" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_NGLsContractsMember_1b8983fb-0149-4627-a2db-6379e5943a9d_terseLabel_en-US" xlink:label="lab_dec_NGLsContractsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">NGLs Contracts</link:label>
    <link:label id="lab_dec_NGLsContractsMember_label_en-US" xlink:label="lab_dec_NGLsContractsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">NGLs Contracts [Member]</link:label>
    <link:label id="lab_dec_NGLsContractsMember_documentation_en-US" xlink:label="lab_dec_NGLsContractsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">NGLs Contracts</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NGLsContractsMember" xlink:href="dec-20250630.xsd#dec_NGLsContractsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_NGLsContractsMember" xlink:to="lab_dec_NGLsContractsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearThreeMember_34917391-2838-4cdd-9041-14c25342aa82_terseLabel_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearThreeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2028</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearThreeMember_label_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearThreeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Three [Member]</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearThreeMember_documentation_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearThreeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeInstrumentPeriodYearThreeMember" xlink:href="dec-20250630.xsd#dec_DerivativeInstrumentPeriodYearThreeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeInstrumentPeriodYearThreeMember" xlink:to="lab_dec_DerivativeInstrumentPeriodYearThreeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CovenantEightMember_60f72234-bb96-4021-b97c-de9b8af2e623_terseLabel_en-US" xlink:label="lab_dec_CovenantEightMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Covenant Eight</link:label>
    <link:label id="lab_dec_CovenantEightMember_label_en-US" xlink:label="lab_dec_CovenantEightMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Covenant Eight [Member]</link:label>
    <link:label id="lab_dec_CovenantEightMember_documentation_en-US" xlink:label="lab_dec_CovenantEightMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Covenant Eight</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CovenantEightMember" xlink:href="dec-20250630.xsd#dec_CovenantEightMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CovenantEightMember" xlink:to="lab_dec_CovenantEightMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProductsAndServicesDomain_2147aded-019e-4a61-b458-069ea996c1e8_terseLabel_en-US" xlink:label="lab_ifrs-full_ProductsAndServicesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Products and services [domain]</link:label>
    <link:label id="lab_ifrs-full_ProductsAndServicesDomain_label_en-US" xlink:label="lab_ifrs-full_ProductsAndServicesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Products and services [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProductsAndServicesDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProductsAndServicesDomain" xlink:to="lab_ifrs-full_ProductsAndServicesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_RiversideLandLLCMember_b07e4373-de0f-4694-b99d-e0f9b29c7d5b_terseLabel_en-US" xlink:label="lab_dec_RiversideLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Riverside Land LLC</link:label>
    <link:label id="lab_dec_RiversideLandLLCMember_label_en-US" xlink:label="lab_dec_RiversideLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Riverside Land LLC [Member]</link:label>
    <link:label id="lab_dec_RiversideLandLLCMember_documentation_en-US" xlink:label="lab_dec_RiversideLandLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Riverside Land LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_RiversideLandLLCMember" xlink:href="dec-20250630.xsd#dec_RiversideLandLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_RiversideLandLLCMember" xlink:to="lab_dec_RiversideLandLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_9e49f728-0577-4414-8759-b5df2d39f61d_terseLabel_en-US" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsidiaries [domain]</link:label>
    <link:label id="lab_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_label_en-US" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsidiaries [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="lab_ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_f1bc4133-b0ed-4eb0-bacc-139c3acde323_negatedLabel_en-US" xlink:label="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Repayment of borrowings</link:label>
    <link:label id="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of borrowings, classified as financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:to="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageShares_1c628af0-7e02-4362-b1f1-01a7965099ae_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average shares outstanding - basic (in shares)</link:label>
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    <link:label id="lab_dec_OaktreeSellersNoteMember_c9cdbf9e-00a5-4e12-b78d-6f4e974c7c5f_terseLabel_en-US" xlink:label="lab_dec_OaktreeSellersNoteMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Oaktree Sellers Note</link:label>
    <link:label id="lab_dec_OaktreeSellersNoteMember_label_en-US" xlink:label="lab_dec_OaktreeSellersNoteMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oaktree Sellers Note [Member]</link:label>
    <link:label id="lab_dec_OaktreeSellersNoteMember_documentation_en-US" xlink:label="lab_dec_OaktreeSellersNoteMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Oaktree Sellers Note</link:label>
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    <link:label id="lab_dec_CurrentDerivativeAssetLiabilityOffset_7eea4d04-9e66-4464-b7a9-525474d7fec2_negatedTerseLabel_en-US" xlink:label="lab_dec_CurrentDerivativeAssetLiabilityOffset" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Current assets</link:label>
    <link:label id="lab_dec_CurrentDerivativeAssetLiabilityOffset_label_en-US" xlink:label="lab_dec_CurrentDerivativeAssetLiabilityOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Derivative Asset, Liability Offset</link:label>
    <link:label id="lab_dec_CurrentDerivativeAssetLiabilityOffset_documentation_en-US" xlink:label="lab_dec_CurrentDerivativeAssetLiabilityOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Current Derivative Asset, Liability Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CurrentDerivativeAssetLiabilityOffset" xlink:href="dec-20250630.xsd#dec_CurrentDerivativeAssetLiabilityOffset"/>
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    <link:label id="lab_ifrs-full_FinancialAssetsRecognisedAsOfAcquisitionDate_101ee0b7-504a-4989-8cb3-83bcb1a5de73_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial assets recognised as of acquisition date</link:label>
    <link:label id="lab_ifrs-full_FinancialAssetsRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_FinancialAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial assets recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsRecognisedAsOfAcquisitionDate"/>
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    <link:label id="lab_ifrs-full_BorrowingsByNameAxis_c05460d6-932a-4fa4-8790-5583bbe95d15_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings by name [axis]</link:label>
    <link:label id="lab_ifrs-full_BorrowingsByNameAxis_label_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings by name [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis"/>
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    <link:label id="lab_dec_TwoWayCollarContractMember_2a598f56-b3ed-46df-b645-b41c431d92a2_terseLabel_en-US" xlink:label="lab_dec_TwoWayCollarContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Two Way Collar Contract</link:label>
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    <link:label id="lab_dec_TwoWayCollarContractMember_documentation_en-US" xlink:label="lab_dec_TwoWayCollarContractMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Way Collar Contract</link:label>
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    <link:label id="lab_dec_NaturalGasContractMember_23f8883a-f586-440c-bba3-b967180db615_terseLabel_en-US" xlink:label="lab_dec_NaturalGasContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Natural Gas Contracts</link:label>
    <link:label id="lab_dec_NaturalGasContractMember_label_en-US" xlink:label="lab_dec_NaturalGasContractMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Natural Gas Contract [Member]</link:label>
    <link:label id="lab_dec_NaturalGasContractMember_documentation_en-US" xlink:label="lab_dec_NaturalGasContractMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Natural Gas Contract</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NaturalGasContractMember" xlink:href="dec-20250630.xsd#dec_NaturalGasContractMember"/>
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    <link:label id="lab_dec_ConsiderationPaidAbstract_a8c7093e-b9d0-4a09-aee5-35f9ac179d1d_terseLabel_en-US" xlink:label="lab_dec_ConsiderationPaidAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consideration paid</link:label>
    <link:label id="lab_dec_ConsiderationPaidAbstract_label_en-US" xlink:label="lab_dec_ConsiderationPaidAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consideration paid [Abstract]</link:label>
    <link:label id="lab_dec_ConsiderationPaidAbstract_documentation_en-US" xlink:label="lab_dec_ConsiderationPaidAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Consideration paid</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ConsiderationPaidAbstract" xlink:href="dec-20250630.xsd#dec_ConsiderationPaidAbstract"/>
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    <link:label id="lab_ifrs-full_ReserveOfSharebasedPayments_76ede736-3656-4e3f-9a10-59a695c8c6e6_terseLabel_en-US" xlink:label="lab_ifrs-full_ReserveOfSharebasedPayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based payment and other reserves</link:label>
    <link:label id="lab_ifrs-full_ReserveOfSharebasedPayments_label_en-US" xlink:label="lab_ifrs-full_ReserveOfSharebasedPayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reserve of share-based payments</link:label>
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    <link:label id="lab_ifrs-full_NoncurrentDerivativeFinancialAssets_b3997087-cd3d-4555-b307-96acbdfefde0_netLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentDerivativeFinancialAssets" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US">Derivative financial instruments</link:label>
    <link:label id="lab_ifrs-full_NoncurrentDerivativeFinancialAssets_0d2abcbc-df6c-466a-b16a-a327adf3a79e_verboseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentDerivativeFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Non-current assets</link:label>
    <link:label id="lab_ifrs-full_NoncurrentDerivativeFinancialAssets_46da6519-46a6-4165-9664-b6a21e378b8a_totalLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentDerivativeFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Non-current assets</link:label>
    <link:label id="lab_ifrs-full_NoncurrentDerivativeFinancialAssets_label_en-US" xlink:label="lab_ifrs-full_NoncurrentDerivativeFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current derivative financial assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentDerivativeFinancialAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentDerivativeFinancialAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentDerivativeFinancialAssets" xlink:to="lab_ifrs-full_NoncurrentDerivativeFinancialAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory_0391c2a3-b036-4610-a67a-06b8d6b1f167_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of share capital, net of customary transaction costs</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of classes of share capital [text block]</link:label>
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    <link:label id="lab_ifrs-full_Borrowings_d36469f0-bfc3-4712-811e-7ab2699ea926_terseLabel_en-US" xlink:label="lab_ifrs-full_Borrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_ifrs-full_Borrowings_label_en-US" xlink:label="lab_ifrs-full_Borrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Borrowings" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Borrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Borrowings" xlink:to="lab_ifrs-full_Borrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory_cd167803-d598-4393-9b1f-2ce019836c56_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for borrowings [text block]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfExpensesByNatureExplanatory_ba719767-a9d4-49b0-a97d-449c6f4e5d87_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfExpensesByNatureExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expenses by Nature</link:label>
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    <link:label id="lab_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss_52ed3d99-2e0d-4e45-ac49-56cbbeba6950_verboseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Unrealized gain (loss) on investment</link:label>
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    <link:label id="lab_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss_label_en-US" xlink:label="lab_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gains (losses) on financial assets at fair value through profit or loss</link:label>
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    <link:label id="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForCostRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts_9cea104f-9e50-43a5-a178-59213cf94853_terseLabel_en-US" xlink:label="lab_dec_IncreaseDecreaseThroughRevisionToEstimateForCostRevisionsProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase attributable to change in cost revisions</link:label>
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    <link:label id="lab_dec_AssetAcquisitionAssetsAcquiredLiabilitiesAssumedNet_e83f9ccf-c03d-4a2f-8ea9-c79079ce0394_totalLabel_en-US" xlink:label="lab_dec_AssetAcquisitionAssetsAcquiredLiabilitiesAssumedNet" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net assets acquired</link:label>
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    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_33ac5cae-dddc-4b0f-9cde-9b57e57e61c8_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in investing activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) investing activities</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfDerivativeFinancialInstrumentsExplanatory_a3e64318-c50d-47b2-91e1-b065207959e7_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDerivativeFinancialInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Financial Instruments</link:label>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_26d60334-a27e-4d13-b697-0256a8f1cc16_totalLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net change in cash and cash equivalents</link:label>
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    <link:label id="lab_dec_PaymentForPenaltyOnEarlyRetirementOfDebt_d69e6d32-287c-4613-8643-71585b1128aa_negatedTerseLabel_en-US" xlink:label="lab_dec_PaymentForPenaltyOnEarlyRetirementOfDebt" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Penalty on early retirement of debt</link:label>
    <link:label id="lab_dec_PaymentForPenaltyOnEarlyRetirementOfDebt_label_en-US" xlink:label="lab_dec_PaymentForPenaltyOnEarlyRetirementOfDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment For Penalty On Early Retirement Of Debt</link:label>
    <link:label id="lab_dec_PaymentForPenaltyOnEarlyRetirementOfDebt_documentation_en-US" xlink:label="lab_dec_PaymentForPenaltyOnEarlyRetirementOfDebt" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payment For Penalty On Early Retirement Of Debt</link:label>
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    <link:label id="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetReductionInScope1MethaneEmissions_1efe9c6c-9731-449e-a9c6-6c972807755d_terseLabel_en-US" xlink:label="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetReductionInScope1MethaneEmissions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sustainability-linked performance target, reduction in Scope 1 methane emissions</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsSustainabilityLinkedPerformanceTargetReductionInScope1MethaneEmissions" xlink:href="dec-20250630.xsd#dec_BorrowingsSustainabilityLinkedPerformanceTargetReductionInScope1MethaneEmissions"/>
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    <link:label id="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesTable_adc90748-f9f2-4d0a-9e82-ba62f66b57e9_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of significant unobservable inputs used in fair value measurement of liabilities [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of significant unobservable inputs used in fair value measurement of liabilities [table]</link:label>
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    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_e1fc0979-5b30-456d-bfaa-29b262a6e4ca_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by (used in) financing activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
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    <link:label id="lab_dec_IncreaseDecreaseInTaxExpenseBenefit_9b432563-37a5-424a-a9b8-de1dba5998e2_negatedLabel_en-US" xlink:label="lab_dec_IncreaseDecreaseInTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Increase in tax expense</link:label>
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    <link:label id="lab_dec_IncreaseDecreaseInTaxExpenseBenefit_documentation_en-US" xlink:label="lab_dec_IncreaseDecreaseInTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Increase (Decrease) In Tax Expense (Benefit)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_IncreaseDecreaseInTaxExpenseBenefit" xlink:href="dec-20250630.xsd#dec_IncreaseDecreaseInTaxExpenseBenefit"/>
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    <link:label id="lab_ifrs-full_EmployeeBenefitsExpense_c4c424b6-d883-409a-a427-08143aca35e2_totalLabel_en-US" xlink:label="lab_ifrs-full_EmployeeBenefitsExpense" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total employees and benefits expense</link:label>
    <link:label id="lab_ifrs-full_EmployeeBenefitsExpense_label_en-US" xlink:label="lab_ifrs-full_EmployeeBenefitsExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee benefits expense</link:label>
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    <link:label id="lab_dec_NumberOfTreasurySharesSoldOrIssuedDuringThePeriod_dbc140c5-5406-415a-a9c6-38e66ee6b6db_terseLabel_en-US" xlink:label="lab_dec_NumberOfTreasurySharesSoldOrIssuedDuringThePeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares issued (in shares)</link:label>
    <link:label id="lab_dec_NumberOfTreasurySharesSoldOrIssuedDuringThePeriod_label_en-US" xlink:label="lab_dec_NumberOfTreasurySharesSoldOrIssuedDuringThePeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Treasury Shares Sold Or Issued During The Period</link:label>
    <link:label id="lab_dec_NumberOfTreasurySharesSoldOrIssuedDuringThePeriod_documentation_en-US" xlink:label="lab_dec_NumberOfTreasurySharesSoldOrIssuedDuringThePeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Treasury Shares Sold Or Issued During The Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NumberOfTreasurySharesSoldOrIssuedDuringThePeriod" xlink:href="dec-20250630.xsd#dec_NumberOfTreasurySharesSoldOrIssuedDuringThePeriod"/>
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    <link:label id="lab_dec_ProceedsFromNonCurrentBorrowingsGross_fdf093ef-728b-44a2-94a1-5e78c3ac801d_terseLabel_en-US" xlink:label="lab_dec_ProceedsFromNonCurrentBorrowingsGross" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from non-current borrowings, gross</link:label>
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    <link:label id="lab_dec_ShareCapitalReservesAndOtherEquityInterestAbstract_label_en-US" xlink:label="lab_dec_ShareCapitalReservesAndOtherEquityInterestAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Capital, Reserves, And Other Equity Interest [Abstract]</link:label>
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    <link:label id="lab_ifrs-full_CurrentAssets_40c64032-d43f-4470-89ac-9cefd56f220e_totalLabel_en-US" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
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    <link:label id="lab_ifrs-full_GainsLossesOnDisposalsOfInvestments_56894a03-e738-4452-adb0-68315405f31c_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnDisposalsOfInvestments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gains (losses) on disposals of investments</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnDisposalsOfInvestments" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesOnDisposalsOfInvestments"/>
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    <link:label id="lab_dec_PaymentsToAcquireOrRedeemEntitysSharesShareBuybackProgramFinancingActivities_3c4ed1b7-e420-4af5-87f5-13db7177f6ee_negatedTerseLabel_en-US" xlink:label="lab_dec_PaymentsToAcquireOrRedeemEntitysSharesShareBuybackProgramFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Repurchase of shares</link:label>
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    <link:label id="lab_dec_PaymentsToAcquireOrRedeemEntitysSharesShareBuybackProgramFinancingActivities_documentation_en-US" xlink:label="lab_dec_PaymentsToAcquireOrRedeemEntitysSharesShareBuybackProgramFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payments to acquire or redeem entity's shares, share buyback program, financing activities</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_PaymentsToAcquireOrRedeemEntitysSharesShareBuybackProgramFinancingActivities" xlink:to="lab_dec_PaymentsToAcquireOrRedeemEntitysSharesShareBuybackProgramFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TreasuryShares_e42a939c-d1e1-414b-8fdb-fb92c36daf73_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_TreasuryShares" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Treasury reserve</link:label>
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    <link:label id="lab_ifrs-full_StatementOfChangesInEquityTable_a94b08f2-04b8-428a-850a-738e8df37f84_terseLabel_en-US" xlink:label="lab_ifrs-full_StatementOfChangesInEquityTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement of changes in equity [table]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityTable"/>
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    <link:label id="lab_dec_DerivativeInstrumentPeriodDomain_documentation_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Dirivative Instrument, Measurement Period [Domain]</link:label>
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    <link:label id="lab_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_ef497b73-21a2-4c30-bcf7-61558a7d2df6_terseLabel_en-US" xlink:label="lab_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Name of Property [Axis]</link:label>
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    <link:label id="lab_dec_ABSMaverickClassANotesMember_328a052a-cd2d-4c53-88d5-ff2bd9ddca0b_terseLabel_en-US" xlink:label="lab_dec_ABSMaverickClassANotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS Maverick Class A Notes</link:label>
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    <link:label id="lab_dec_ABSMaverickClassANotesMember_documentation_en-US" xlink:label="lab_dec_ABSMaverickClassANotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS Maverick Class A Notes</link:label>
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    <link:label id="lab_ifrs-full_MergerReserve_55603efa-92ed-44b8-bc3b-76527544a48d_terseLabel_en-US" xlink:label="lab_ifrs-full_MergerReserve" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Merger reserve</link:label>
    <link:label id="lab_ifrs-full_MergerReserve_label_en-US" xlink:label="lab_ifrs-full_MergerReserve" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Merger reserve</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MergerReserve" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MergerReserve"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MergerReserve" xlink:to="lab_ifrs-full_MergerReserve" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSIXClassANoteMember_8807dcbe-e9ef-4037-a034-c7688ab40f47_terseLabel_en-US" xlink:label="lab_dec_ABSIXClassANoteMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS IX Class A Note</link:label>
    <link:label id="lab_dec_ABSIXClassANoteMember_label_en-US" xlink:label="lab_dec_ABSIXClassANoteMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS IX Class A Note [Member]</link:label>
    <link:label id="lab_dec_ABSIXClassANoteMember_documentation_en-US" xlink:label="lab_dec_ABSIXClassANoteMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS IX Class A Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSIXClassANoteMember" xlink:href="dec-20250630.xsd#dec_ABSIXClassANoteMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSIXClassANoteMember" xlink:to="lab_dec_ABSIXClassANoteMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsCovenantIfADiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal_374ba912-6455-4103-b373-db795bde3bbd_terseLabel_en-US" xlink:label="lab_dec_BorrowingsCovenantIfADiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings, covenant, if a diversion or Rapid amortization event is continuing, percentage of excess cash flows that must be paid towards additional principal</link:label>
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    <link:label id="lab_dec_BorrowingsCovenantIfADiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal_documentation_en-US" xlink:label="lab_dec_BorrowingsCovenantIfADiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Covenant, If A Diversion Or Rapid Amortization Event Is Continuing, Percentage Of Excess Cash Flows That must Be Paid Towards Additional Principal</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsCovenantIfADiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:href="dec-20250630.xsd#dec_BorrowingsCovenantIfADiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsCovenantIfADiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:to="lab_dec_BorrowingsCovenantIfADiversionOrRapidAmortizationEventIsContinuingPercentageOfExcessCashFlowsThatMustBePaidTowardsAdditionalPrincipal" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfAssetsDomain_7ff29c08-68c0-4946-be46-1eb7d4fafdcd_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfAssetsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of assets</link:label>
    <link:label id="lab_ifrs-full_ClassesOfAssetsDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfAssetsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of assets [domain]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain" xlink:to="lab_ifrs-full_ClassesOfAssetsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CurrentFiscalYearEndDate_6b9e8766-91cc-4b90-a472-1a9371120cdf_terseLabel_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:label id="lab_dei_CurrentFiscalYearEndDate_label_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CurrentFiscalYearEndDate" xlink:to="lab_dei_CurrentFiscalYearEndDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_Borrowings1Member_52c0e7dd-914b-4d74-aacf-3848cbb76e4b_terseLabel_en-US" xlink:label="lab_dec_Borrowings1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_dec_Borrowings1Member_label_en-US" xlink:label="lab_dec_Borrowings1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings1 [Member]</link:label>
    <link:label id="lab_dec_Borrowings1Member_documentation_en-US" xlink:label="lab_dec_Borrowings1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_Borrowings1Member" xlink:href="dec-20250630.xsd#dec_Borrowings1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_Borrowings1Member" xlink:to="lab_dec_Borrowings1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ProductionMeasurementInputMember_1d34b10d-be8e-4f53-915e-1b38384b9ec5_terseLabel_en-US" xlink:label="lab_dec_ProductionMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Production</link:label>
    <link:label id="lab_dec_ProductionMeasurementInputMember_label_en-US" xlink:label="lab_dec_ProductionMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Production, Measurement Input [Member]</link:label>
    <link:label id="lab_dec_ProductionMeasurementInputMember_documentation_en-US" xlink:label="lab_dec_ProductionMeasurementInputMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Production, Measurement Input</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ProductionMeasurementInputMember" xlink:href="dec-20250630.xsd#dec_ProductionMeasurementInputMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ProductionMeasurementInputMember" xlink:to="lab_dec_ProductionMeasurementInputMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DividendsPaidOrdinarySharesPerShare_5fc1e5a7-877d-4358-a84b-b3ad18a34b38_terseLabel_en-US" xlink:label="lab_ifrs-full_DividendsPaidOrdinarySharesPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividend per Share (in USD/GBP per share)</link:label>
    <link:label id="lab_ifrs-full_DividendsPaidOrdinarySharesPerShare_d002beec-e55b-4407-91b7-a4b7c583664b_verboseLabel_en-US" xlink:label="lab_ifrs-full_DividendsPaidOrdinarySharesPerShare" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Dividend per share (in USD per share)</link:label>
    <link:label id="lab_ifrs-full_DividendsPaidOrdinarySharesPerShare_label_en-US" xlink:label="lab_ifrs-full_DividendsPaidOrdinarySharesPerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends paid, ordinary shares per share</link:label>
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    <link:label id="lab_ifrs-full_BorrowingsRecognisedAsOfAcquisitionDate_6c583985-a7d4-4f73-8728-8a8968a3763d_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_ifrs-full_BorrowingsRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_BorrowingsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsRecognisedAsOfAcquisitionDate"/>
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    <link:label id="lab_ifrs-full_BottomOfRangeMember_28ab496c-72f0-4f7e-83ee-0bbc9e2717ca_terseLabel_en-US" xlink:label="lab_ifrs-full_BottomOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Bottom of range</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BottomOfRangeMember" xlink:to="lab_ifrs-full_BottomOfRangeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OtherNotesPayableMember_d60d919c-2f9b-4c8c-a6ac-554e6819cc0b_terseLabel_en-US" xlink:label="lab_dec_OtherNotesPayableMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Notes Payable</link:label>
    <link:label id="lab_dec_OtherNotesPayableMember_label_en-US" xlink:label="lab_dec_OtherNotesPayableMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Notes Payable [Member]</link:label>
    <link:label id="lab_dec_OtherNotesPayableMember_documentation_en-US" xlink:label="lab_dec_OtherNotesPayableMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Notes Payable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherNotesPayableMember" xlink:href="dec-20250630.xsd#dec_OtherNotesPayableMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OtherNotesPayableMember" xlink:to="lab_dec_OtherNotesPayableMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsExplanatory_449cd285-d8f1-4724-9e43-6b2c5cf0a00d_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Financial Instruments</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory_7f4b63d0-5024-4d43-b17b-558548627fe0_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impairment of Non-Financial Assets</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_11b08ee7-bbf3-483b-a7b7-c0c1f32ec4e0_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about borrowings [line items]</link:label>
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    <link:label id="lab_ifrs-full_ParValuePerShare_817502de-09b7-4ad8-a3a6-e78efbea79d5_terseLabel_en-US" xlink:label="lab_ifrs-full_ParValuePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Par value per share (in gbp per share)</link:label>
    <link:label id="lab_ifrs-full_ParValuePerShare_label_en-US" xlink:label="lab_ifrs-full_ParValuePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Par value per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ParValuePerShare" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ParValuePerShare"/>
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    <link:label id="lab_ifrs-full_ProfitLoss_91170ba8-3e73-4b56-9581-47a9576343e7_totalLabel_en-US" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net income (loss)</link:label>
    <link:label id="lab_ifrs-full_ProfitLoss_87ef570c-4757-42c1-9e50-f9ec854323ed_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net income (loss)</link:label>
    <link:label id="lab_ifrs-full_ProfitLoss_a749225e-c77b-4951-b7a8-3f25e9cef584_verboseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net income (loss)</link:label>
    <link:label id="lab_ifrs-full_ProfitLoss_label_en-US" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit (loss)</link:label>
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    <link:label id="lab_dec_OtherMember_7f5a0a69-5b1b-4522-bce0-1217515ac2a0_terseLabel_en-US" xlink:label="lab_dec_OtherMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
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    <link:label id="lab_dec_OtherMember_documentation_en-US" xlink:label="lab_dec_OtherMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherMember" xlink:href="dec-20250630.xsd#dec_OtherMember"/>
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    <link:label id="lab_ifrs-full_NetDeferredTaxAssets_f5c60cdf-13a0-4336-8511-186378cf4ef6_verboseLabel_en-US" xlink:label="lab_ifrs-full_NetDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Deferred tax asset</link:label>
    <link:label id="lab_ifrs-full_NetDeferredTaxAssets_label_en-US" xlink:label="lab_ifrs-full_NetDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net deferred tax assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetDeferredTaxAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NetDeferredTaxAssets"/>
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    <link:label id="lab_dec_CashAndCashEquivalents1Member_06bee9ee-4c6a-441d-afe7-c77db1af15a8_terseLabel_en-US" xlink:label="lab_dec_CashAndCashEquivalents1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_CashAndCashEquivalents1Member" xlink:href="dec-20250630.xsd#dec_CashAndCashEquivalents1Member"/>
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    <link:label id="lab_dei_AmendmentFlag_838ed636-d2ef-4c19-ad5b-095a347bb713_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
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    <link:label id="lab_ifrs-full_ComponentsOfEquityDomain_b1996e92-6951-45cb-89b7-2b532d188f7e_terseLabel_en-US" xlink:label="lab_ifrs-full_ComponentsOfEquityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of equity</link:label>
    <link:label id="lab_ifrs-full_ComponentsOfEquityDomain_label_en-US" xlink:label="lab_ifrs-full_ComponentsOfEquityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Components of equity [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
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    <link:label id="lab_dec_OriginalIssuePremiumsMember_7c06c198-f151-4ff0-b20e-8334e599d9a1_terseLabel_en-US" xlink:label="lab_dec_OriginalIssuePremiumsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Original issue premiums</link:label>
    <link:label id="lab_dec_OriginalIssuePremiumsMember_label_en-US" xlink:label="lab_dec_OriginalIssuePremiumsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Original Issue Premiums [Member]</link:label>
    <link:label id="lab_dec_OriginalIssuePremiumsMember_documentation_en-US" xlink:label="lab_dec_OriginalIssuePremiumsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Original Issue Premiums</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OriginalIssuePremiumsMember" xlink:href="dec-20250630.xsd#dec_OriginalIssuePremiumsMember"/>
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    <link:label id="lab_ifrs-full_DividendsPaid_23b051a8-e451-4f69-b3da-f960cfcd00a3_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_DividendsPaid" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Dividends</link:label>
    <link:label id="lab_ifrs-full_DividendsPaid_label_en-US" xlink:label="lab_ifrs-full_DividendsPaid" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends recognised as distributions to owners</link:label>
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    <link:label id="lab_ifrs-full_NoncurrentLiabilities_a8937343-2f06-494b-9b03-593faaadb23e_totalLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total non-current liabilities</link:label>
    <link:label id="lab_ifrs-full_NoncurrentLiabilities_label_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentLiabilities" xlink:to="lab_ifrs-full_NoncurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_e181bf03-7a9d-4d6c-bba0-e39f7f564c3c_terseLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment recognised as of acquisition date</link:label>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, plant and equipment recognised as of acquisition date</link:label>
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    <link:label id="lab_dec_IncreaseDecreaseInWorkingCapitalAbstract_10eb6c70-e8e2-4e21-bc03-5dec402c46a3_terseLabel_en-US" xlink:label="lab_dec_IncreaseDecreaseInWorkingCapitalAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Working capital adjustments:</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dec_IncreaseDecreaseInWorkingCapitalAbstract" xlink:href="dec-20250630.xsd#dec_IncreaseDecreaseInWorkingCapitalAbstract"/>
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    <link:label id="lab_dec_MidstreamOperatingExpenseMember_3b45b97c-2450-4cd6-94a7-572275c1357c_terseLabel_en-US" xlink:label="lab_dec_MidstreamOperatingExpenseMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Midstream operating expense</link:label>
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    <link:label id="lab_dec_MidstreamOperatingExpenseMember_documentation_en-US" xlink:label="lab_dec_MidstreamOperatingExpenseMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Midstream Operating Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_MidstreamOperatingExpenseMember" xlink:href="dec-20250630.xsd#dec_MidstreamOperatingExpenseMember"/>
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    <link:label id="lab_dec_ProductionTaxesMember_cbd90e1f-4c4e-47a1-bc3e-01675cf5797b_terseLabel_en-US" xlink:label="lab_dec_ProductionTaxesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Production taxes</link:label>
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    <link:label id="lab_dec_ProductionTaxesMember_documentation_en-US" xlink:label="lab_dec_ProductionTaxesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Production Taxes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ProductionTaxesMember" xlink:href="dec-20250630.xsd#dec_ProductionTaxesMember"/>
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    <link:label id="lab_ifrs-full_DisclosureOfContingentLiabilitiesExplanatory_523f58ea-19ff-4987-bfd2-cb7ec9be5eca_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfContingentLiabilitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitments &amp; Contingencies</link:label>
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    <link:label id="lab_dec_AssetAcquisitionTradeReceivablesNet_224b7bfc-5e72-44e0-8ed7-6bd871bc4911_terseLabel_en-US" xlink:label="lab_dec_AssetAcquisitionTradeReceivablesNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade receivables, net</link:label>
    <link:label id="lab_dec_AssetAcquisitionTradeReceivablesNet_label_en-US" xlink:label="lab_dec_AssetAcquisitionTradeReceivablesNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Trade Receivables, Net</link:label>
    <link:label id="lab_dec_AssetAcquisitionTradeReceivablesNet_documentation_en-US" xlink:label="lab_dec_AssetAcquisitionTradeReceivablesNet" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Acquisition, Trade Receivables, Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_AssetAcquisitionTradeReceivablesNet" xlink:href="dec-20250630.xsd#dec_AssetAcquisitionTradeReceivablesNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_AssetAcquisitionTradeReceivablesNet" xlink:to="lab_dec_AssetAcquisitionTradeReceivablesNet" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RangeDomain_25bea680-8495-4fd4-a15b-b537b8a15a8d_terseLabel_en-US" xlink:label="lab_ifrs-full_RangeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Range [domain]</link:label>
    <link:label id="lab_ifrs-full_RangeDomain_label_en-US" xlink:label="lab_ifrs-full_RangeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RangeDomain" xlink:to="lab_ifrs-full_RangeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DepreciationAndAmortizationExpenseMember_d74cc99e-0b38-408a-99a5-efec35c86adc_terseLabel_en-US" xlink:label="lab_dec_DepreciationAndAmortizationExpenseMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
    <link:label id="lab_dec_DepreciationAndAmortizationExpenseMember_label_en-US" xlink:label="lab_dec_DepreciationAndAmortizationExpenseMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation And Amortization Expense [Member]</link:label>
    <link:label id="lab_dec_DepreciationAndAmortizationExpenseMember_documentation_en-US" xlink:label="lab_dec_DepreciationAndAmortizationExpenseMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Depreciation And Amortization Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DepreciationAndAmortizationExpenseMember" xlink:href="dec-20250630.xsd#dec_DepreciationAndAmortizationExpenseMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DepreciationAndAmortizationExpenseMember" xlink:to="lab_dec_DepreciationAndAmortizationExpenseMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RetainedEarningsMember_0d9dc0a5-4a0d-4b96-aacd-0e8a0f2bf537_terseLabel_en-US" xlink:label="lab_ifrs-full_RetainedEarningsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Retained Earnings (Accumulated Deficit)</link:label>
    <link:label id="lab_ifrs-full_RetainedEarningsMember_label_en-US" xlink:label="lab_ifrs-full_RetainedEarningsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retained earnings [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarningsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RetainedEarningsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RetainedEarningsMember" xlink:to="lab_ifrs-full_RetainedEarningsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment_498735f4-560b-4c39-bf0c-0097c1389c29_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">(Gain) loss on natural gas and oil properties and equipment</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for gain (loss) on disposals, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputLiabilities_0779f2a1-4553-4fba-85c2-05bf19d18539_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in asset retirement obligation due to reasonably possible 10% decrease in measurement input</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputLiabilities_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:to="lab_ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_TransportationExpenseMember_f4e487ae-3f93-47ff-8446-8ba304eaa8a8_terseLabel_en-US" xlink:label="lab_dec_TransportationExpenseMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transportation expense</link:label>
    <link:label id="lab_dec_TransportationExpenseMember_label_en-US" xlink:label="lab_dec_TransportationExpenseMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Transportation Expense [Member]</link:label>
    <link:label id="lab_dec_TransportationExpenseMember_documentation_en-US" xlink:label="lab_dec_TransportationExpenseMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Transportation Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_TransportationExpenseMember" xlink:href="dec-20250630.xsd#dec_TransportationExpenseMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_TransportationExpenseMember" xlink:to="lab_dec_TransportationExpenseMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_44f5dcd1-d047-4207-86cd-4c1a99f455e5_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in trade and other payables and other current liabilities</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for increase (decrease) in trade and other payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:to="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_InterestIncurredOnBorrowings_cb70bbed-b039-40af-88f2-9d0500f67359_terseLabel_en-US" xlink:label="lab_dec_InterestIncurredOnBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total interest incurred on amortizing debt</link:label>
    <link:label id="lab_dec_InterestIncurredOnBorrowings_label_en-US" xlink:label="lab_dec_InterestIncurredOnBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Incurred On Borrowings</link:label>
    <link:label id="lab_dec_InterestIncurredOnBorrowings_documentation_en-US" xlink:label="lab_dec_InterestIncurredOnBorrowings" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Incurred On Borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_InterestIncurredOnBorrowings" xlink:href="dec-20250630.xsd#dec_InterestIncurredOnBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_InterestIncurredOnBorrowings" xlink:to="lab_dec_InterestIncurredOnBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RecurringFairValueMeasurementMember_4bb76999-6dc6-48a4-adbc-18e4309878d7_terseLabel_en-US" xlink:label="lab_ifrs-full_RecurringFairValueMeasurementMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Recurring allowance for credit losses</link:label>
    <link:label id="lab_ifrs-full_RecurringFairValueMeasurementMember_label_en-US" xlink:label="lab_ifrs-full_RecurringFairValueMeasurementMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Recurring fair value measurement [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RecurringFairValueMeasurementMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RecurringFairValueMeasurementMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RecurringFairValueMeasurementMember" xlink:to="lab_ifrs-full_RecurringFairValueMeasurementMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DPLionHoldCoLLCMember_51c13db6-c225-4eb5-828b-34055fc71b6f_terseLabel_en-US" xlink:label="lab_dec_DPLionHoldCoLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">DP Lion HoldCo LLC</link:label>
    <link:label id="lab_dec_DPLionHoldCoLLCMember_label_en-US" xlink:label="lab_dec_DPLionHoldCoLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">DP Lion HoldCo LLC [Member]</link:label>
    <link:label id="lab_dec_DPLionHoldCoLLCMember_documentation_en-US" xlink:label="lab_dec_DPLionHoldCoLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">DP Lion HoldCo LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DPLionHoldCoLLCMember" xlink:href="dec-20250630.xsd#dec_DPLionHoldCoLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DPLionHoldCoLLCMember" xlink:to="lab_dec_DPLionHoldCoLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_f75d483e-cbee-47e1-a214-848453316852_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for leases [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CurrentIncomeTaxExpenseAbstract_929fbdb4-12ae-40d6-ba99-074a17cc74b0_terseLabel_en-US" xlink:label="lab_dec_CurrentIncomeTaxExpenseAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current income tax (benefit) expense</link:label>
    <link:label id="lab_dec_CurrentIncomeTaxExpenseAbstract_label_en-US" xlink:label="lab_dec_CurrentIncomeTaxExpenseAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Income Tax Expense [Abstract]</link:label>
    <link:label id="lab_dec_CurrentIncomeTaxExpenseAbstract_documentation_en-US" xlink:label="lab_dec_CurrentIncomeTaxExpenseAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Current Income Tax Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CurrentIncomeTaxExpenseAbstract" xlink:href="dec-20250630.xsd#dec_CurrentIncomeTaxExpenseAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CurrentIncomeTaxExpenseAbstract" xlink:to="lab_dec_CurrentIncomeTaxExpenseAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_ScenarioUnspecifiedDomain_f9612eec-641a-48c0-87a6-5b86e01fbdc9_terseLabel_en-US" xlink:label="lab_srt_ScenarioUnspecifiedDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Scenario [Domain]</link:label>
    <link:label id="lab_srt_ScenarioUnspecifiedDomain_label_en-US" xlink:label="lab_srt_ScenarioUnspecifiedDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Scenario [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScenarioUnspecifiedDomain" xlink:to="lab_srt_ScenarioUnspecifiedDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeNotionalAmountVolume_f6da5cc0-0b57-49d6-8249-8b1fe93230ea_terseLabel_en-US" xlink:label="lab_dec_DerivativeNotionalAmountVolume" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Volume (in Mcf or Bbl)</link:label>
    <link:label id="lab_dec_DerivativeNotionalAmountVolume_label_en-US" xlink:label="lab_dec_DerivativeNotionalAmountVolume" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Notional Amount, Volume</link:label>
    <link:label id="lab_dec_DerivativeNotionalAmountVolume_documentation_en-US" xlink:label="lab_dec_DerivativeNotionalAmountVolume" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Notional Amount, Volume</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeNotionalAmountVolume" xlink:href="dec-20250630.xsd#dec_DerivativeNotionalAmountVolume"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeNotionalAmountVolume" xlink:to="lab_dec_DerivativeNotionalAmountVolume" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AnalysisOfIncomeAndExpenseAbstract_label_en-US" xlink:label="lab_ifrs-full_AnalysisOfIncomeAndExpenseAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Analysis of income and expense [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AnalysisOfIncomeAndExpenseAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AnalysisOfIncomeAndExpenseAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AnalysisOfIncomeAndExpenseAbstract" xlink:to="lab_ifrs-full_AnalysisOfIncomeAndExpenseAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_HedgedItemAssets_42c3a9d6-eefc-4529-a443-d6b5191a7787_terseLabel_en-US" xlink:label="lab_ifrs-full_HedgedItemAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Principal Hedged</link:label>
    <link:label id="lab_ifrs-full_HedgedItemAssets_label_en-US" xlink:label="lab_ifrs-full_HedgedItemAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Hedged item, assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_HedgedItemAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_HedgedItemAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_HedgedItemAssets" xlink:to="lab_ifrs-full_HedgedItemAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DepreciationAndAmortisationExpense_47c36a70-f55b-45e0-822c-e9571fac4e9b_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_DepreciationAndAmortisationExpense" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Depreciation, depletion and amortization</link:label>
    <link:label id="lab_ifrs-full_DepreciationAndAmortisationExpense_7b6f7ced-71d5-4ae3-b149-a8dde232d344_terseLabel_en-US" xlink:label="lab_ifrs-full_DepreciationAndAmortisationExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total depreciation, depletion and amortization</link:label>
    <link:label id="lab_ifrs-full_DepreciationAndAmortisationExpense_label_en-US" xlink:label="lab_ifrs-full_DepreciationAndAmortisationExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation and amortisation expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationAndAmortisationExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationAndAmortisationExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DepreciationAndAmortisationExpense" xlink:to="lab_ifrs-full_DepreciationAndAmortisationExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearSixMember_d4f8dede-5139-4567-8955-9253b50f6c66_terseLabel_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearSixMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2031</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearSixMember_label_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearSixMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Six [Member]</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearSixMember_documentation_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearSixMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Six</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeInstrumentPeriodYearSixMember" xlink:href="dec-20250630.xsd#dec_DerivativeInstrumentPeriodYearSixMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeInstrumentPeriodYearSixMember" xlink:to="lab_dec_DerivativeInstrumentPeriodYearSixMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSIXClassBNoteMember_88311362-d043-45ef-aeeb-a01f8e2db750_terseLabel_en-US" xlink:label="lab_dec_ABSIXClassBNoteMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS IX ClassB Note</link:label>
    <link:label id="lab_dec_ABSIXClassBNoteMember_label_en-US" xlink:label="lab_dec_ABSIXClassBNoteMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS IX ClassB Note [Member]</link:label>
    <link:label id="lab_dec_ABSIXClassBNoteMember_documentation_en-US" xlink:label="lab_dec_ABSIXClassBNoteMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS IX ClassB Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSIXClassBNoteMember" xlink:href="dec-20250630.xsd#dec_ABSIXClassBNoteMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSIXClassBNoteMember" xlink:to="lab_dec_ABSIXClassBNoteMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSINoteMember_872a0e59-aca6-461b-a575-173be90d303e_terseLabel_en-US" xlink:label="lab_dec_ABSINoteMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS I Notes</link:label>
    <link:label id="lab_dec_ABSINoteMember_label_en-US" xlink:label="lab_dec_ABSINoteMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS I Note [Member]</link:label>
    <link:label id="lab_dec_ABSINoteMember_documentation_en-US" xlink:label="lab_dec_ABSINoteMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS I Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSINoteMember" xlink:href="dec-20250630.xsd#dec_ABSINoteMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSINoteMember" xlink:to="lab_dec_ABSINoteMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_NoncurrentDerivativeLiabilityBeforeOffset_ffcfb6a3-0abf-4ed2-8adb-fbf108557343_negatedTerseLabel_en-US" xlink:label="lab_dec_NoncurrentDerivativeLiabilityBeforeOffset" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Non-current liabilities</link:label>
    <link:label id="lab_dec_NoncurrentDerivativeLiabilityBeforeOffset_label_en-US" xlink:label="lab_dec_NoncurrentDerivativeLiabilityBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncurrent Derivative Liability, Before Offset</link:label>
    <link:label id="lab_dec_NoncurrentDerivativeLiabilityBeforeOffset_documentation_en-US" xlink:label="lab_dec_NoncurrentDerivativeLiabilityBeforeOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Noncurrent Derivative Liability, Before Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_NoncurrentDerivativeLiabilityBeforeOffset" xlink:href="dec-20250630.xsd#dec_NoncurrentDerivativeLiabilityBeforeOffset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_NoncurrentDerivativeLiabilityBeforeOffset" xlink:to="lab_dec_NoncurrentDerivativeLiabilityBeforeOffset" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ThreeWayCollarContractSoldPutMember_225b3f0e-44cd-4c00-86c0-73bc04614b45_terseLabel_en-US" xlink:label="lab_dec_ThreeWayCollarContractSoldPutMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Three Way Collar Contract Sold Put</link:label>
    <link:label id="lab_dec_ThreeWayCollarContractSoldPutMember_label_en-US" xlink:label="lab_dec_ThreeWayCollarContractSoldPutMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Way Collar Contract Sold Put [Member]</link:label>
    <link:label id="lab_dec_ThreeWayCollarContractSoldPutMember_documentation_en-US" xlink:label="lab_dec_ThreeWayCollarContractSoldPutMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Way Collar Contract Sold Put</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ThreeWayCollarContractSoldPutMember" xlink:href="dec-20250630.xsd#dec_ThreeWayCollarContractSoldPutMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ThreeWayCollarContractSoldPutMember" xlink:to="lab_dec_ThreeWayCollarContractSoldPutMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CarryingAmountMember_e583eb02-e4d3-4511-93bd-dbe603a24a06_terseLabel_en-US" xlink:label="lab_ifrs-full_CarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Carrying amount [member]</link:label>
    <link:label id="lab_ifrs-full_CarryingAmountMember_label_en-US" xlink:label="lab_ifrs-full_CarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Carrying amount [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CarryingAmountMember" xlink:to="lab_ifrs-full_CarryingAmountMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDividendsExplanatory_637a06b1-b03d-4b84-963d-0ef9324ba206_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDividendsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividends</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDividendsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDividendsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of dividends [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDividendsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDividendsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDividendsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfDividendsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ABSMaverickNotesClassBMember_a6743b84-d0b6-4260-ac87-fd092ca2166b_terseLabel_en-US" xlink:label="lab_dec_ABSMaverickNotesClassBMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes, Class B</link:label>
    <link:label id="lab_dec_ABSMaverickNotesClassBMember_label_en-US" xlink:label="lab_dec_ABSMaverickNotesClassBMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes, Class B [Member]</link:label>
    <link:label id="lab_dec_ABSMaverickNotesClassBMember_documentation_en-US" xlink:label="lab_dec_ABSMaverickNotesClassBMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABS Maverick Notes, Class B</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ABSMaverickNotesClassBMember" xlink:href="dec-20250630.xsd#dec_ABSMaverickNotesClassBMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ABSMaverickNotesClassBMember" xlink:to="lab_dec_ABSMaverickNotesClassBMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets_7bfedf9b-2fb8-47f6-ac20-45dc664997a2_terseLabel_en-US" xlink:label="lab_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of reasonably possible increase in unobservable input, assets</link:label>
    <link:label id="lab_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets_label_en-US" xlink:label="lab_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of reasonably possible increase in unobservable input, assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets" xlink:to="lab_ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialAssets_86cc7cda-e4e5-406e-9362-d585f8f68deb_verboseLabel_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Derivative financial instruments</link:label>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialAssets_1326e50c-3ae9-4271-ae2c-98f97d61c9a7_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current assets</link:label>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialAssets_e41e9139-ede6-4abc-8e29-89a1357116d8_totalLabel_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Current assets</link:label>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialAssets_label_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current derivative financial assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentDerivativeFinancialAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentDerivativeFinancialAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentDerivativeFinancialAssets" xlink:to="lab_ifrs-full_CurrentDerivativeFinancialAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_TwoWayCollarContractPurchasedCallsMember_7da48b9c-ca45-406e-9a58-a6e2293c5910_terseLabel_en-US" xlink:label="lab_dec_TwoWayCollarContractPurchasedCallsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Two Way Collar Contract Purchased Calls</link:label>
    <link:label id="lab_dec_TwoWayCollarContractPurchasedCallsMember_label_en-US" xlink:label="lab_dec_TwoWayCollarContractPurchasedCallsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Way Collar Contract Purchased Calls [Member]</link:label>
    <link:label id="lab_dec_TwoWayCollarContractPurchasedCallsMember_documentation_en-US" xlink:label="lab_dec_TwoWayCollarContractPurchasedCallsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Way Collar Contract Purchased Calls</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_TwoWayCollarContractPurchasedCallsMember" xlink:href="dec-20250630.xsd#dec_TwoWayCollarContractPurchasedCallsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_TwoWayCollarContractPurchasedCallsMember" xlink:to="lab_dec_TwoWayCollarContractPurchasedCallsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_OtherAdjustingCostsMember_ef7c2812-dec3-4612-875c-a8179b96ecdb_terseLabel_en-US" xlink:label="lab_dec_OtherAdjustingCostsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other adjusting costs</link:label>
    <link:label id="lab_dec_OtherAdjustingCostsMember_label_en-US" xlink:label="lab_dec_OtherAdjustingCostsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Adjusting Costs [Member]</link:label>
    <link:label id="lab_dec_OtherAdjustingCostsMember_documentation_en-US" xlink:label="lab_dec_OtherAdjustingCostsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Adjusting Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_OtherAdjustingCostsMember" xlink:href="dec-20250630.xsd#dec_OtherAdjustingCostsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_OtherAdjustingCostsMember" xlink:to="lab_dec_OtherAdjustingCostsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NotionalAmount_f512ab51-887d-4bb6-8970-2fd213fb0e5d_terseLabel_en-US" xlink:label="lab_ifrs-full_NotionalAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notional amount</link:label>
    <link:label id="lab_ifrs-full_NotionalAmount_label_en-US" xlink:label="lab_ifrs-full_NotionalAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Notional amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotionalAmount" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotionalAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NotionalAmount" xlink:to="lab_ifrs-full_NotionalAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_UnobservableInputsDomain_297286a7-785e-41c1-be6b-92d4b16f152c_terseLabel_en-US" xlink:label="lab_ifrs-full_UnobservableInputsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unobservable inputs [domain]</link:label>
    <link:label id="lab_ifrs-full_UnobservableInputsDomain_label_en-US" xlink:label="lab_ifrs-full_UnobservableInputsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unobservable inputs [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UnobservableInputsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnobservableInputsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_UnobservableInputsDomain" xlink:to="lab_ifrs-full_UnobservableInputsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformancePeriodForAverageCalculation_5fd86221-2efc-4643-a5e9-b2f7b41dc3c6_terseLabel_en-US" xlink:label="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformancePeriodForAverageCalculation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sustainability-linked performance targets, TRIR Performance, period for average calculation</link:label>
    <link:label id="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformancePeriodForAverageCalculation_label_en-US" xlink:label="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformancePeriodForAverageCalculation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Sustainability-Linked Performance Targets, TRIR Performance, Period For Average Calculation</link:label>
    <link:label id="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformancePeriodForAverageCalculation_documentation_en-US" xlink:label="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformancePeriodForAverageCalculation" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Sustainability-Linked Performance Targets, TRIR Performance, Period For Average Calculation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformancePeriodForAverageCalculation" xlink:href="dec-20250630.xsd#dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformancePeriodForAverageCalculation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformancePeriodForAverageCalculation" xlink:to="lab_dec_BorrowingsSustainabilityLinkedPerformanceTargetsTRIRPerformancePeriodForAverageCalculation" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ChangesInEquityAbstract_58fd678e-8cc4-47c5-a4ec-0d77d56c847a_terseLabel_en-US" xlink:label="lab_ifrs-full_ChangesInEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in equity</link:label>
    <link:label id="lab_ifrs-full_ChangesInEquityAbstract_label_en-US" xlink:label="lab_ifrs-full_ChangesInEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Changes in equity [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ChangesInEquityAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ChangesInEquityAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ChangesInEquityAbstract" xlink:to="lab_ifrs-full_ChangesInEquityAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_CurrentDerivativeAssetsLiabilities_9286fa40-3b7c-486d-8e7d-715ab0b3a347_totalLabel_en-US" xlink:label="lab_dec_CurrentDerivativeAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net assets (liabilities) - current</link:label>
    <link:label id="lab_dec_CurrentDerivativeAssetsLiabilities_label_en-US" xlink:label="lab_dec_CurrentDerivativeAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Derivative Assets (Liabilities)</link:label>
    <link:label id="lab_dec_CurrentDerivativeAssetsLiabilities_documentation_en-US" xlink:label="lab_dec_CurrentDerivativeAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Current Derivative Assets (Liabilities)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_CurrentDerivativeAssetsLiabilities" xlink:href="dec-20250630.xsd#dec_CurrentDerivativeAssetsLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_CurrentDerivativeAssetsLiabilities" xlink:to="lab_dec_CurrentDerivativeAssetsLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeInstrumentPeriodAxis_fa59999b-0783-40b8-8709-03f5fea8c25b_terseLabel_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period [Axis]</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodAxis_label_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period [Axis]</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodAxis_documentation_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeInstrumentPeriodAxis" xlink:href="dec-20250630.xsd#dec_DerivativeInstrumentPeriodAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeInstrumentPeriodAxis" xlink:to="lab_dec_DerivativeInstrumentPeriodAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentLeaseLiabilities_c633858a-d7fe-4002-8219-e90bb8f22292_verboseLabel_en-US" xlink:label="lab_ifrs-full_CurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_ifrs-full_CurrentLeaseLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current lease liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLeaseLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentLeaseLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLeaseLiabilities" xlink:to="lab_ifrs-full_CurrentLeaseLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OilAndGasAssets_1fc08563-e87b-4f67-b76e-6c989893250f_terseLabel_en-US" xlink:label="lab_ifrs-full_OilAndGasAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Natural gas and oil properties, net</link:label>
    <link:label id="lab_ifrs-full_OilAndGasAssets_label_en-US" xlink:label="lab_ifrs-full_OilAndGasAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil and gas assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OilAndGasAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OilAndGasAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OilAndGasAssets" xlink:to="lab_ifrs-full_OilAndGasAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromNoncurrentBorrowings_23ea683c-b577-4fe2-bf24-1d84b1a251df_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from non-current borrowings</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromNoncurrentBorrowings_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from non-current borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromNoncurrentBorrowings" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromNoncurrentBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromNoncurrentBorrowings" xlink:to="lab_ifrs-full_ProceedsFromNoncurrentBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DisclosureOfBusinessCombinationsAssetAcquisitionsAndDivestituresTableTextBlock_206e192a-f544-470c-8ea6-90def0b7cbb4_terseLabel_en-US" xlink:label="lab_dec_DisclosureOfBusinessCombinationsAssetAcquisitionsAndDivestituresTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisitions &amp; Divestitures</link:label>
    <link:label id="lab_dec_DisclosureOfBusinessCombinationsAssetAcquisitionsAndDivestituresTableTextBlock_label_en-US" xlink:label="lab_dec_DisclosureOfBusinessCombinationsAssetAcquisitionsAndDivestituresTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Business Combinations, Asset Acquisitions and Divestitures [Table Text Block]</link:label>
    <link:label id="lab_dec_DisclosureOfBusinessCombinationsAssetAcquisitionsAndDivestituresTableTextBlock_documentation_en-US" xlink:label="lab_dec_DisclosureOfBusinessCombinationsAssetAcquisitionsAndDivestituresTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure Of Business Combinations, Asset Acquisitions and Divestitures</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DisclosureOfBusinessCombinationsAssetAcquisitionsAndDivestituresTableTextBlock" xlink:href="dec-20250630.xsd#dec_DisclosureOfBusinessCombinationsAssetAcquisitionsAndDivestituresTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DisclosureOfBusinessCombinationsAssetAcquisitionsAndDivestituresTableTextBlock" xlink:to="lab_dec_DisclosureOfBusinessCombinationsAssetAcquisitionsAndDivestituresTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_StandAloneCallContractSoldCallsMember_ac83e889-ae97-4dd3-ae41-22bb484ae2af_terseLabel_en-US" xlink:label="lab_dec_StandAloneCallContractSoldCallsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stand Alone Call Contract Sold Calls</link:label>
    <link:label id="lab_dec_StandAloneCallContractSoldCallsMember_label_en-US" xlink:label="lab_dec_StandAloneCallContractSoldCallsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stand Alone Call Contract Sold Calls [Member]</link:label>
    <link:label id="lab_dec_StandAloneCallContractSoldCallsMember_documentation_en-US" xlink:label="lab_dec_StandAloneCallContractSoldCallsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Stand Alone Call Contract Sold Calls</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_StandAloneCallContractSoldCallsMember" xlink:href="dec-20250630.xsd#dec_StandAloneCallContractSoldCallsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_StandAloneCallContractSoldCallsMember" xlink:to="lab_dec_StandAloneCallContractSoldCallsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearEightMember_60f617b1-9ecd-46f7-bb1a-c16d9bd8afa1_terseLabel_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearEightMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2033</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearEightMember_label_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearEightMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Eight [Member]</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearEightMember_documentation_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearEightMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Eight</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeInstrumentPeriodYearEightMember" xlink:href="dec-20250630.xsd#dec_DerivativeInstrumentPeriodYearEightMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeInstrumentPeriodYearEightMember" xlink:to="lab_dec_DerivativeInstrumentPeriodYearEightMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DilutedEarningsLossPerShare_c6e623ed-a54b-4fd9-b49f-7429c8b4f8e6_terseLabel_en-US" xlink:label="lab_ifrs-full_DilutedEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings (loss) per share - diluted (in dollar per share)</link:label>
    <link:label id="lab_ifrs-full_DilutedEarningsLossPerShare_label_en-US" xlink:label="lab_ifrs-full_DilutedEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Diluted earnings (loss) per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DilutedEarningsLossPerShare" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DilutedEarningsLossPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DilutedEarningsLossPerShare" xlink:to="lab_ifrs-full_DilutedEarningsLossPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MaturityDomain_cb4ef0e1-9b68-439e-944c-2f09deb80592_terseLabel_en-US" xlink:label="lab_ifrs-full_MaturityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturity</link:label>
    <link:label id="lab_ifrs-full_MaturityDomain_label_en-US" xlink:label="lab_ifrs-full_MaturityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maturity [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MaturityDomain" xlink:to="lab_ifrs-full_MaturityDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ProvisionForDecommissioningRestorationAndRehabilitationCostsRecognizedAsOfAcquisitionDate_7810cffe-af84-46cc-926d-f0bd959d2bb8_negatedTerseLabel_en-US" xlink:label="lab_dec_ProvisionForDecommissioningRestorationAndRehabilitationCostsRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Asset retirement obligations, liability portion</link:label>
    <link:label id="lab_dec_ProvisionForDecommissioningRestorationAndRehabilitationCostsRecognizedAsOfAcquisitionDate_label_en-US" xlink:label="lab_dec_ProvisionForDecommissioningRestorationAndRehabilitationCostsRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Provision For Decommissioning, Restoration And Rehabilitation Costs Recognized As Of Acquisition Date</link:label>
    <link:label id="lab_dec_ProvisionForDecommissioningRestorationAndRehabilitationCostsRecognizedAsOfAcquisitionDate_documentation_en-US" xlink:label="lab_dec_ProvisionForDecommissioningRestorationAndRehabilitationCostsRecognizedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Provision For Decommissioning, Restoration And Rehabilitation Costs Recognized As Of Acquisition Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_ProvisionForDecommissioningRestorationAndRehabilitationCostsRecognizedAsOfAcquisitionDate" xlink:href="dec-20250630.xsd#dec_ProvisionForDecommissioningRestorationAndRehabilitationCostsRecognizedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_ProvisionForDecommissioningRestorationAndRehabilitationCostsRecognizedAsOfAcquisitionDate" xlink:to="lab_dec_ProvisionForDecommissioningRestorationAndRehabilitationCostsRecognizedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeAssetsLiabilities_86662171-5eb6-44d9-81a3-454f5d1cabf5_totalLabel_en-US" xlink:label="lab_dec_DerivativeAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total net assets (liabilities)</link:label>
    <link:label id="lab_dec_DerivativeAssetsLiabilities_label_en-US" xlink:label="lab_dec_DerivativeAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Assets (Liabilities)</link:label>
    <link:label id="lab_dec_DerivativeAssetsLiabilities_documentation_en-US" xlink:label="lab_dec_DerivativeAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Assets (Liabilities)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeAssetsLiabilities" xlink:href="dec-20250630.xsd#dec_DerivativeAssetsLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeAssetsLiabilities" xlink:to="lab_dec_DerivativeAssetsLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearTwoMember_63962ac4-1768-40f0-8bef-b7b0be36d775_terseLabel_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearTwoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2027</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearTwoMember_label_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearTwoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Two [Member]</link:label>
    <link:label id="lab_dec_DerivativeInstrumentPeriodYearTwoMember_documentation_en-US" xlink:label="lab_dec_DerivativeInstrumentPeriodYearTwoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Instrument, Period, Year Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeInstrumentPeriodYearTwoMember" xlink:href="dec-20250630.xsd#dec_DerivativeInstrumentPeriodYearTwoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeInstrumentPeriodYearTwoMember" xlink:to="lab_dec_DerivativeInstrumentPeriodYearTwoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory_e64ad2bd-a079-470b-bc18-5c75a3163b1f_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of interests in subsidiaries</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of interests in subsidiaries [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory"/>
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    <link:label id="lab_ifrs-full_PurchaseOfTreasuryShares_a72c18bd-30c9-48b5-82b0-41ae7285f343_terseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payment for purchase of treasury shares</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfTreasuryShares_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase of treasury shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfTreasuryShares" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchaseOfTreasuryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfTreasuryShares" xlink:to="lab_ifrs-full_PurchaseOfTreasuryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DerivativeAssetLiabilityOffset_db626db2-56a5-486a-9584-ce1b6a127b99_negatedTotalLabel_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityOffset" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:label id="lab_dec_DerivativeAssetLiabilityOffset_label_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityOffset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Liability Offset</link:label>
    <link:label id="lab_dec_DerivativeAssetLiabilityOffset_documentation_en-US" xlink:label="lab_dec_DerivativeAssetLiabilityOffset" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Asset, Liability Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DerivativeAssetLiabilityOffset" xlink:href="dec-20250630.xsd#dec_DerivativeAssetLiabilityOffset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DerivativeAssetLiabilityOffset" xlink:to="lab_dec_DerivativeAssetLiabilityOffset" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_PurchasePricePerShare_1b0dbd2b-b345-47a3-b89f-b568e0ab43ee_terseLabel_en-US" xlink:label="lab_dec_PurchasePricePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase price per share (in USD/GBP per share)</link:label>
    <link:label id="lab_dec_PurchasePricePerShare_label_en-US" xlink:label="lab_dec_PurchasePricePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Price Per Share</link:label>
    <link:label id="lab_dec_PurchasePricePerShare_documentation_en-US" xlink:label="lab_dec_PurchasePricePerShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Purchase Price Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_PurchasePricePerShare" xlink:href="dec-20250630.xsd#dec_PurchasePricePerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_PurchasePricePerShare" xlink:to="lab_dec_PurchasePricePerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_DisclosureOfDetailedInformationAboutRestrictedCashTableTextBlock_30000524-3bed-4018-9023-ce35a8fb044f_terseLabel_en-US" xlink:label="lab_dec_DisclosureOfDetailedInformationAboutRestrictedCashTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Restricted Cash</link:label>
    <link:label id="lab_dec_DisclosureOfDetailedInformationAboutRestrictedCashTableTextBlock_label_en-US" xlink:label="lab_dec_DisclosureOfDetailedInformationAboutRestrictedCashTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Detailed Information About Restricted Cash [Table Text Block]</link:label>
    <link:label id="lab_dec_DisclosureOfDetailedInformationAboutRestrictedCashTableTextBlock_documentation_en-US" xlink:label="lab_dec_DisclosureOfDetailedInformationAboutRestrictedCashTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure Of Detailed Information About Restricted Cash</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dec_DisclosureOfDetailedInformationAboutRestrictedCashTableTextBlock" xlink:href="dec-20250630.xsd#dec_DisclosureOfDetailedInformationAboutRestrictedCashTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dec_DisclosureOfDetailedInformationAboutRestrictedCashTableTextBlock" xlink:to="lab_dec_DisclosureOfDetailedInformationAboutRestrictedCashTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AverageEffectiveTaxRate_2f014dd2-c9a0-4e0e-83f6-0d4bc5de4197_terseLabel_en-US" xlink:label="lab_ifrs-full_AverageEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effective tax rate</link:label>
    <link:label id="lab_ifrs-full_AverageEffectiveTaxRate_0908ff1c-325f-412a-aea6-33f8c8d7a55a_totalLabel_en-US" xlink:label="lab_ifrs-full_AverageEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Effective tax rate</link:label>
    <link:label id="lab_ifrs-full_AverageEffectiveTaxRate_label_en-US" xlink:label="lab_ifrs-full_AverageEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Average effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AverageEffectiveTaxRate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AverageEffectiveTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AverageEffectiveTaxRate" xlink:to="lab_ifrs-full_AverageEffectiveTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_dec_ThreeWayCollarContractMember_d9bc37ef-ac8f-4b18-b8c0-a8783383c00e_terseLabel_en-US" xlink:label="lab_dec_ThreeWayCollarContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Three-way collars</link:label>
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