X0101 EFFECT 33 LIVE 2011-02-04 16:00:00

S-4

0001465872 OFFSHORE GROUP INVESTMENT Ltd 333-170841 0001465876 EMERALD DRILLER Co 333-170841-11 0001465873 SAPPHIRE DRILLER Co 333-170841-10 0001465864 VANTAGE HOLDING HUNGARY KFT 333-170841-09 0001465863 VANTAGE DRILLING NETHERLANDS B.V. 333-170841-08 0001419428 Vantage Drilling CO 333-170841-07 0001465871 VANTAGE DRILLER I CO. 333-170841-06 0001465865 VANTAGE DRILLER II CO. 333-170841-05 0001465867 VANTAGE DRILLER IV CO. 333-170841-04 0001465862 VANTAGE INTERNATIONAL MANAGEMENT CO. 333-170841-03 0001504851 MANDARIN DRILLING Corp 333-170841-02 0001504852 P2021 RIG CO. 333-170841-01