Cover	6 Months Ended
	Jun. 30, 2023 shares
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2023
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2023
Current Fiscal Year End Date	--12-31
Entity File Number	001-40450
Entity Registrant Name	OceanTech Acquisitions I Corp.
Entity Central Index Key	0001846809
Entity Tax Identification Number	85-2122558
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	515 Madison Avenue
Entity Address, Address Line Two	8th Floor – Suite 8133
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10022
City Area Code	(929)
Local Phone Number	412-1272
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Elected Not To Use the Extended Transition Period	false
Entity Shell Company	true
Units, each consisting of one Share of Class A Common Stock and One Redeemable warrant
Title of 12(b) Security	Units, each consisting of one share of Class A common stock and one redeemable warrant
Trading Symbol	OTECU
Security Exchange Name	NASDAQ
Common Class A [Member]
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	OTEC
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding	915,975
Warrants Each Warrant Exercisable For One Share Of Classa Common Stock For 11. 50 Per Share [Member]
Title of 12(b) Security	Warrants, each warrant exercisable for one share of Class A common stock for $11.50 per share
Trading Symbol	OTECW
Security Exchange Name	NASDAQ
Common Class B [Member]
Entity Common Stock, Shares Outstanding	2,581,500