EXHIBIT 21.1

GLOBALSANTAFE CORPORATION

AND SUBSIDIARIES

February 21, 2007



|                                                              |  |                                            |  |                                               |     
|------------------------------------------------------------- |  | ------------------------------------------ |  | --------------------------------------------- | ----
|Name of Company                                               |  | State or OtherJurisdiction ofIncorporation |  | Percent ofVoting StockOwned byImmediateParent |     
|GlobalSantaFe Corporation                                     |  | Cayman Islands                             |  |                                               |     
|Covent GardenServiços e Marketing Sociedade Unipessoal Lda   |  | Portugal                                   |  | 100.00                                        | %   
|GlobalSantaFe Financial Services (Luxembourg) S.a.r.l.        |  | Luxembourg                                 |  | 99.93                                         | %(a)
|GlobalSantaFe Group Financing Limited Liability Company       |  | Hungary                                    |  | 100                                           | %   
|Entities Holdings, Inc.                                       |  | Delaware                                   |  | 100                                           | %   
|15375 Memorial Corporation                                    |  | Delaware                                   |  | 100                                           | %   
|Key Perfuracoes Maritimas Limitada                            |  | Brazil                                     |  | 100                                           | %   
|Santa Fe Braun Inc.                                           |  | Delaware                                   |  | 100                                           | %   
|Santa Fe Drilling Company of Venezuela, C.A.                  |  | California                                 |  | 100                                           | %   
|Santa Fe Servicos de Perfuracao Limitada                      |  | Brazil                                     |  | 100                                           | %   
|GlobalSantaFe International Drilling Corporation              |  | Bahamas                                    |  | 100                                           | %   
|GlobalSantaFe Services (BVI) Inc.                             |  | British Virgin Islands                     |  | 100                                           | %   
|GlobalSantaFe Drilling U.K. Limited                           |  | Scotland                                   |  | 100                                           | %   
|Challenger Minerals (North Sea) Limited                       |  | Scotland                                   |  | 100                                           | %   
|GlobalSantaFe Onshore Services Limited                        |  | Scotland                                   |  | 100                                           | %   
|GlobalSantaFe Operations (Barbados) Inc.                      |  | Cayman Islands                             |  | 100                                           | %   
|GlobalSantaFe U.S. Holdings Inc.                              |  | Delaware                                   |  | 100                                           | %   
|Oilfield Services, Inc.                                       |  | Cayman Islands                             |  | 100                                           | %   
|Global Marine Inc.                                            |  | Delaware                                   |  | 100                                           | %   
|(See separate section for subsidiaries of Global Marine Inc.) |  |                                            |  |                                               |     
|GlobalSantaFe Drilling (South Atlantic) Inc.                  |  | British Virgin Islands                     |  | 75                                            | %(b)
|GlobalSantaFe West Africa Drilling Limited                    |  | Bahamas                                    |  | 100                                           | %   
|GlobalSantaFe International Drilling Inc.                     |  | British Virgin Islands                     |  | 100                                           | %   
|Global Offshore Drilling Limited                              |  | Nigeria                                    |  | 70                                            | %   
|GlobalSantaFe Denmark Holdings ApS                            |  | Denmark                                    |  | 100                                           | %   
|GlobalSantaFe B.V.                                            |  | Netherlands                                |  | 100                                           | %   
|Challenger Minerals (Nigeria) Limited                         |  | NIgeria                                    |  | 99                                            | %(c)
|GlobalSantaFe International (Canada) Drilling Company         |  | Nova Scotia                                |  | 100                                           | %   
|GlobalSantaFe Servicios de Venezuela, C.A.                    |  | Venezuela                                  |  | 99.01                                         | %(d)
|GlobalSantaFe do Brasil Ltda.                                 |  | Brazil                                     |  | 99                                            | %(e)
|Challenger Minerals (Celtic Sea) Limited                      |  | British Virgin Islands                     |  | 100                                           | %   
|GlobalSantaFe North Sea Limited                               |  | Bahamas                                    |  | 100                                           | %   
|GlobalSantaFe Operations (Australia) Pty Ltd                  |  | Australia                                  |  | 100                                           | %   
|GlobalSantaFe Overseas Limited                                |  | Bahamas                                    |  | 100                                           | %   
|GlobalSantaFe Saudi Arabia Ltd.                               |  | British Virgin Islands                     |  | 100                                           | %   
|GlobalSantaFe Services (Egypt) LLC                            |  | Egypt                                      |  | 75                                            | %(f)
|GlobalSantaFe South America LLC                               |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe Campeche Holdings LLC                           |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe Drilling Mexico, S. de R.L. de C.V.             |  | Mexico                                     |  | 99.99                                         | %(g)
|GlobalSantaFe Mexico Holdings LLC                             |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe Operations (Mexico) LLC                         |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe Tampico, S. de R.L. de C.V.                     |  | Mexico                                     |  | 99.99                                         | %(h)
|GlobalSantaFe Southeast Asia (Drilling) Pte. Ltd.             |  | Singapore                                  |  | 100                                           | %   
|GlobalSantaFe Technical Services Egypt LLC                    |  | Egypt                                      |  | 75                                            | %(i)



---

|                                                         |  |                                            |  |                                               |     
|-------------------------------------------------------- |  | ------------------------------------------ |  | --------------------------------------------- | ----
|Name of Company                                          |  | State or OtherJurisdiction ofIncorporation |  | Percent ofVoting StockOwned byImmediateParent |     
|GlobalSantaFe Corporation (continued)                    |  |                                            |  |                                               |     
|Intermarine Serviços Petroliferos Ltda.                  |  | Brazil                                     |  | 99.998                                        | %(j)
|Intermarine Services (International) Limited             |  | Bahamas                                    |  | 100                                           | %   
|GlobalSantaFe Drilling (N.A.) N.V.                       |  | Netherlands Antilles                       |  | 100                                           | %   
|GlobalSantaFe Services Netherlands B.V.                  |  | Netherlands                                |  | 100                                           | %   
|P.T. Santa Fe Supraco Indonesia                          |  | Indonesia                                  |  | 95                                            | %   
|GlobalSantaFe Drilling Operations Inc.                   |  | Cayman Islands                             |  | 100                                           | %   
|GlobalSantaFe (Africa) Inc.                              |  | Cayman Islands                             |  | 100                                           | %   
|GlobalSantaFe (Labuan) Inc.                              |  | Malaysia                                   |  | 100                                           | %   
|GlobalSantaFe Offshore Services Inc.                     |  | Cayman Islands                             |  | 100                                           | %   
|GlobalSantaFe Holding Company (North Sea) Limited        |  | England                                    |  | 100                                           | %   
|GlobalSantaFe Drilling Company (North Sea) Limited       |  | England                                    |  | 100                                           | %   
|GlobalSantaFe Drilling Company (Overseas) Limited        |  | England                                    |  | 100                                           | %   
|GlobalSantaFe Drilling Services (North Sea) Limited      |  | England                                    |  | 100                                           | %   
|GlobalSantaFe Techserv (North Sea) Limited               |  | England                                    |  | 100                                           | %   
|Santa Fe Drilling Company (U.K.) Limited                 |  | England                                    |  | 100                                           | %   
|GlobalSantaFe International Services Inc.                |  | Panama                                     |  | 100                                           | %   
|GlobalSantaFe Drilling Venezuela, C.A.                   |  | Venezuela                                  |  | 100                                           | %   
|GlobalSantaFe Operations (BVI) Inc.                      |  | British Virgin Islands                     |  | 100                                           | %   
|GlobalSantaFe Leasing Limited                            |  | British Virgin Islands                     |  | 100                                           | %   
|GlobalSantaFe Hungary Services Limited Liability Company |  | Hungary                                    |  | 99.3                                          | %(k)
|Platform Capital N.V.                                    |  | Netherlands Antilles                       |  | 100                                           | %   
|GlobalSantaFe Nederland B.V.                             |  | Netherlands                                |  | 100                                           | %   
|GlobalSantaFe AG                                         |  | Switzerland                                |  | 97                                            | %   
|GlobalSantaFe Drilling Company (Canada) Limited          |  | Nova Scotia                                |  | 100                                           | %   
|GlobalSantaFe (Norge) AS                                 |  | Norway                                     |  | 100                                           | %   
|Platform Financial N.V.                                  |  | Netherlands Antilles                       |  | 100                                           | %   
|Santa Fe Drilling (Nigeria) Limited                      |  | Nigeria                                    |  | 60                                            | %   
|Saudi Drilling Company Limited                           |  | Saudi Arabia                               |  | 90                                            | %(l)
|Separate Section for Subsidiaries of Global Marine Inc.  |  |                                            |  |                                               |     
|Applied Drilling Technology Inc.                         |  | Texas                                      |  | 100                                           | %   
|Eaton Industries of Houston, Inc.                        |  | Texas                                      |  | 100                                           | %   
|Campeche Drilling Services Inc.                          |  | Delaware                                   |  | 100                                           | %   
|Challenger Minerals Inc.                                 |  | California                                 |  | 100                                           | %   
|GlobalSantaFe Arctic Ltd.                                |  | Canada                                     |  | 100                                           | %   
|GlobalSantaFe Corporate Services Inc.                    |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe de Venezuela Inc.                          |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe Drilling Company                           |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe Caribbean Inc.                             |  | California                                 |  | 100                                           | %   
|GlobalSantaFe Deepwater Drilling Inc.                    |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe Beaufort Sea Inc.                          |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe Development Inc.                           |  | California                                 |  | 100                                           | %   
|GlobalSantaFe GOM Services Inc.                          |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe Leasing Corporation                        |  | Bahamas                                    |  | 100                                           | %   
|GlobalSantaFe C.R. Luigs Limited                         |  | England                                    |  | 100                                           | %   
|GlobalSantaFe U.S. Drilling Inc.                         |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe Drilling Trinidad LLC                      |  | Delaware                                   |  | 100                                           | %   
|Resource Rig Supply Inc.                                 |  | Delaware                                   |  | 100                                           | %   
|GlobalSantaFe Communications, Inc.                       |  | Delaware                                   |  | 100                                           | %   
|Santa Fe Construction Company                            |  | Delaware                                   |  | 100                                           | %   
|Intermarine Services Inc.                                |  | Texas                                      |  | 100                                           | %   
|Turnkey Ventures de Mexico Inc.                          |  | Delaware                                   |  | 100                                           | %   



---

NOTES:



|(a) | The remaining 0.07% is owned by GlobalSantaFe Corporation.
|--- | ----------------------------------------------------------

|(b) | The remaining 25% is owned directly by GlobalSantaFe Holding Company (North Sea) Limited and a de minimis amount (1 share) is owned by GlobalSantaFe Overseas Limited.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(c) | The remaining 1% is owned directly by GlobalSantaFe International Drilling Inc.
|--- | -------------------------------------------------------------------------------

|(d) | The remaining 0.99% is owned directly by GlobalSantaFe Services (BVI) Inc.
|--- | --------------------------------------------------------------------------

|(e) | The remaining 1% is owned directly by GlobalSantaFe Overseas Limited.
|--- | ---------------------------------------------------------------------

|(f) | The remaining 25% is owned directly by GlobalSantaFe Services (BVI) Inc.
|--- | ------------------------------------------------------------------------

|(g) | Less than 0.01% is owned directly by GlobalSantaFe Mexico Holdings LLC.
|--- | -----------------------------------------------------------------------

|(h) | Less than 0.01% is owned by GlobalSantaFe Mexico Holdings LLC.
|--- | --------------------------------------------------------------

|(i) | The remaining 25% is owned directly by GlobalSantaFe Services (BVI) Inc.
|--- | ------------------------------------------------------------------------

|(j) | The remaining 0.001% is owned by GlobalSantaFe Overseas Limited.
|--- | ----------------------------------------------------------------

|(k) | The remaining 0.7% is owned directly by GlobalSantaFe Services (BVI) Inc.
|--- | -------------------------------------------------------------------------

|(l) | The remaining 10% is owned directly by GlobalSantaFe Nederland B.V.
|--- | -------------------------------------------------------------------