| | | | | |
| Name of Subsidiary | Jurisdiction of Formation |
| Cal Dive I-Title XI, Inc. | Texas |
| Deepwater Abandonment Alternatives, Inc. | Texas |
| Energy Resource Technology (U.K.) Limited | Scotland |
| ERT Camelot Limited | Scotland |
| Helix do Brasil Serviços de Petróleo Ltda. | Brazil |
| Helix Energy Solutions (U.K.) Limited | Scotland |
| Helix Group Holdings S.à r.l. | Grand Duchy of Luxembourg |
| Helix Offshore Crewing Services Limited | Scotland |
| Helix Offshore Crewing Services PTE. Ltd. | Singapore |
| Helix Offshore Holdings Ltd. | Cayman Islands |
| Helix Offshore International Holdings S.à r.l. | Grand Duchy of Luxembourg |
| Helix Offshore International, Inc. | Texas |
| Helix Offshore Ltd. | Cayman Islands |
| Helix Offshore Services A.S. | Norway |
| Helix Offshore Services Limited | Scotland |
| Helix Oil & Gas (U.K.) Limited | Scotland |
| Helix Offshore Services S.à r.l. | Grand Duchy of Luxembourg |
| Helix Property Corp. | Texas |
| Helix Q5000 Holdings S.à r.l. | Grand Duchy of Luxembourg |
| Helix Robotics Solutions, Inc. | Texas |
| Helix Robotics Solutions International Corp. | Texas |
| Helix Robotics Solutions Limited | Scotland |
| Helix Subsea Construction, Inc. | Delaware |
| Helix Vessel Finance S.à r.l. | Grand Duchy of Luxembourg |
| Helix Well Ops Inc. | Texas |
| Helix Well Ops (U.K.) Limited | Scotland |
| Independence Hub, LLC (20% owned) | Delaware |
| Kommandor LLC | Delaware |
| Offshore Well Services, S. de R.L. de C.V. | Mexico |
| Subsea Technologies Group Limited (70% owned) | Scotland |
| Subsea Technologies Limited (70% owned) | Scotland |
