| Name of Subsidiary                                                     |                Jurisdiction of Incorporation |
|------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------|
|                                                                   |                                                                                                               |
| Drillship Hydra Owners Inc.                                            | Marshall Islands                                                                                                   |
| Drillship Paros Owners Inc.                                            | Marshall Islands                                                                                                   |
| Drillship Kithira Owners Inc.                                          | Marshall Islands                                                                                                   |
| Drillship Skopelos Owners Inc.                                         | Marshall Islands                                                                                                   |
| Ocean Rig AS                                                           | Norway                                                                                                             |
| Ocean Rig UK Ltd.                                                      | United Kingdom                                                                                                     |
| Ocean Rig Ltd.                                                         | United Kingdom                                                                                                     |
| Ocean Rig Ghana Ltd.                                                   | Ghana                                                                                                              |
| Ocean Rig Canada Inc.                                                  | Canada                                                                                                             |
| Ocean Rig North Sea AS                                                 | Norway                                                                                                             |
| Ocean Rig 1 Inc.                                                       | Marshall Islands                                                                                                   |
| Ocean Rig 2 Inc.                                                       | Marshall Islands                                                                                                   |
| Ocean Rig 1 Shareholders Inc.                                          | Marshall Islands                                                                                                   |
| Ocean Rig 2 Shareholders Inc.                                          | Marshall Islands                                                                                                   |
| Drill Rigs Holdings Inc.                                               | Marshall Islands                                                                                                   |
| Drillships Investment Inc.                                             | Marshall Islands                                                                                                   |
| Drillships Holdings Inc.                                               | Marshall Islands                                                                                                   |
| Kithira Shareholders Inc.                                              | Marshall Islands                                                                                                   |
| Skopelos Shareholders Inc.                                             | Marshall Islands                                                                                                   |
| Drillship Hydra Shareholders Inc.                                      | Marshall Islands                                                                                                   |
| Drillship Paros Shareholders Inc.                                      | Marshall Islands                                                                                                   |
| Ocean Rig Operations Inc.                                              | Marshall Islands                                                                                                   |
| Primelead Limited                                                      | Cyprus                                                                                                             |
| Ocean Rig Black Sea Operations B.V.                                    | The Netherlands                                                                                                    |
| Ocean Rig Drilling Operations Cooperatief U.A.                         | The Netherlands                                                                                                    |
| Ocean Rig Black Sea Cooperatief U.A                                    | The Netherlands                                                                                                    |
| Ocean Rig Deep Water Drilling Ltd.                                     | Nigeria                                                                                                            |
| Ocean Rig Drilling Operations B.V.                                     | The Netherlands                                                                                                    |
| Algarve Finance Ltd.                                                   | Marshall Islands                                                                                                   |
| Alley Finance Ltd.                                                     | Marshall Islands                                                                                                   |
| Drillship Skiathos Shareholders Inc.                                   | Marshall Islands                                                                                                   |
| Drillship Skyros Shareholders Inc.                                     | Marshall Islands                                                                                                   |
| Drillship Kythnos Shareholders Inc.                                    | Marshall Islands                                                                                                   |
| Drillship Skiathos Owners Inc.                                         | Marshall Islands                                                                                                   |
| Drillship Skyros Owners Inc.                                           | Marshall Islands                                                                                                   |
| Drillship Kythnos Owners Inc.                                          | Marshall Islands                                                                                                   |
| Ocean Rig 1 Greenland Operations Inc.                                  | Marshall Islands                                                                                                   |
| Ocean Rig Corcovado Greenland Operations Inc.                          | Marshall Islands                                                                                                   |
| Ocean Rig Olympia Ghana Operations Limited                             | Ghana                                                                                                              |
| Ocean Rig Poseidon Operations Inc. (formerly Tanzania Operations Inc.) | Marshall Islands                                                                                                   |

----

| Name of Subsidiary                                           |                                          Jurisdiction of Incorporation |
|--------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Ocean Rig Do Brasil Serviços De Petroleo Ltda.          | Brazil                                                                                                                                                                                                                                                                         |
| Ocean Rig Falkland Operations Inc.                           | Marshall Islands                                                                                                                                                                                                                                                               |
| Drill Rigs Operations Inc.                                   | Marshall Islands                                                                                                                                                                                                                                                               |
| Ocean Rig Olympia Brasil Operations Cooperatief UA           | The Netherlands                                                                                                                                                                                                                                                                |
| Ocean Rig Olympia Brasil Operations B.V.                     | The Netherlands                                                                                                                                                                                                                                                                |
| Drillships Holdings Operations Inc.                          | Marshall Islands                                                                                                                                                                                                                                                               |
| Drillships Investment Operations Inc.                        | Marshall Islands                                                                                                                                                                                                                                                               |
| Ocean Rig Rio de Janeiro Serviços de Petroleo Ltda.     | Brazil                                                                                                                                                                                                                                                                         |
| Ocean Rig Drilling Do Brasil Serviços de Petroleo Ltda. | Brazil                                                                                                                                                                                                                                                                         |
| Ocean Rig Offshore Management Ltd.                           | Jersey                                                                                                                                                                                                                                                                         |
| Ocean Rig Brasil Cooperatief UA                              | The Netherlands                                                                                                                                                                                                                                                                |
| Ocean Rig Brasil B.V.                                        | The Netherlands                                                                                                                                                                                                                                                                |
| Ocean Rig Angola Operations Inc.                             | Marshall Islands                                                                                                                                                                                                                                                               |
| Ocean Rig EG Operations Inc.                                 | Marshall Islands                                                                                                                                                                                                                                                               |