Exhibit 21.1
SUBSIDIARIES
| Subsidiary | Jurisdiction of Organization | |
| Diamond M Corporation | Texas | |
| Diamond Offshore Development Company | Delaware | |
| Diamond Offshore Finance Company | Delaware | |
| Diamond Offshore Management Company | Delaware | |
| Diamond Offshore Company | Delaware | |
| Diamond Offshore General Company | Delaware | |
| Diamond Offshore Services Company | Delaware | |
| Arethusa Off-Shore Company | Delaware | |
| Arethusa/Zapata Off-Shore Brasil Ltda. | Brazil | |
| Diamond M Servicios, S.A. | Venezuela | |
| Diamond Offshore Contract Services, S.A. | Panama | |
| Diamond Offshore International Limited | Cayman Islands | |
| Diamond Hungary Leasing, L.L.C. | Hungary | |
| Diamond Offshore (Bermuda) Limited | Bermuda | |
| Diamond Offshore Drilling (Bermuda) Limited | Bermuda | |
| Diamond Offshore (Brazil) L.L.C. | Delaware | |
| Brasdril-Sociedade de Perfuracoes Ltda. | Brazil | |
| Diamond Offshore Drilling (Overseas) L.L.C. | Delaware | |
| Diamond Offshore Drilling (Nigeria) Limited | Nigeria | |
| Mexdrill, L.L.C. | Delaware | |
| Mexdrill Offshore, S. de R.L. de C.V. | Mexico | |
| Offshore Drilling Services of Mexico, S. de R.L. de C.V. | Mexico | |
| Diamond Offshore Drilling Company N.V. | Netherlands Antilles | |
| Diamond Offshore Netherlands B.V. | The Netherlands | |
| Offshore Drilling Services (Netherlands) B.V. | The Netherlands | |
| Diamond Offshore Drilling Limited | Cayman Islands | |
| Diamond Offshore (Australia) L.L.C. | Delaware | |
| Diamond Offshore Holding, L.L.C. | Delaware | |
| Diamond Offshore Drilling Sdn. Bhd. | Malaysia | |
| Diamond Offshore Leasing Ltd. | Malaysia | |
| Diamond Offshore Limited | England | |
| Diamond Offshore Drilling (UK) Ltd. | England | |
| Diamond Offshore Services Limited | Bermuda | |
| Diamond Offshore (USA) L.L.C. | Delaware | |
| Diamond Offshore (Trinidad) L.L.C. | Delaware | |
| M-S Drilling S.A. | Panama | |
| Storm Nigeria Limited | Nigeria | |
| Z North Sea, Ltd. | Delaware | |
| Diamond Offshore Drilling (Netherlands) B.V. | The Netherlands | |
| Afcons Arethusa Off-Shore Services Ltd. | India | |
| Pt Aqza Dharma | Indonesia | |
| Diamond Offshore (Singapore) Pte. Limited | Singapore |