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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 Offshore Crewing Services Limited

Scotland

Helix Offshore Crewing Services PTE. Ltd.

Singapore

Helix Offshore Energy Services (Australia) Pty Ltd.

Australia

Helix Offshore Holdings Ltd.

Delaware

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 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

Scotland