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Name of Subsidiary

Jurisdiction of Formation

AES-EOT Equipment Holdings, LLC

Louisiana

Alliance Energy Services, LLC

Louisiana

Alliance Group of Louisiana L.L.C.

Louisiana

Alliance Industry Holdings, LLC

Louisiana

Alliance LB Dallas Holdings, LLC

Louisiana

Alliance LB Miami Holdings, LLC

Louisiana

Alliance Liftboats, LLC

Louisiana

Alliance Maritime Holdings, LLC

Louisiana

Alliance Offshore, LLC

Louisiana

Alliance Special Ventures Holdings, LLC

Louisiana

Alliance-Triton GOM Holdings, LLC

Delaware

Alliance Vessel Leasing, LLC

Louisiana

Cal Dive I-Title XI, Inc.

Texas

Deepwater Abandonment Alternatives, Inc.

Texas

Dickson Road Investments, LLC

Louisiana

Energy Resource Technology (U.K.) Limited

Scotland

ERT Camelot Limited

Scotland

Explorer DSV Holdings, LLC

Louisiana

Heavy Lift Holdings, LLC

Louisiana

Hedron Holdings, LLC

Louisiana

Helix Alliance Decom, LLC

Delaware

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 LLC

Delaware

Helix Robotics Solutions, Inc.

Texas

Helix Robotics Solutions International Corp.

Texas

Helix Robotics Solutions Limited

Scotland

Helix Subsea Construction, Inc.

Delaware

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

Patriot DSV Holdings, LLC

Louisiana

Subsea Technologies Group Limited

Scotland

Triton Diving Services, LLC

Louisiana

Whitney Clare Holdings, LLC

Louisiana

Whitney Liftboats, LLC

Louisiana

Whitney Maritime Holdings, LLC

Louisiana