EX-21 6 ex211.txt EXHIBIT 21.1 SUBSIDIARY COMPANIES AND STATE OR JURISDICTION OF INCORPORATION UNITED STATES - Atwood Drilling, Inc. Delaware 100% Atwood Hunter Co. Delaware 100% Atwood Management, Inc. Delaware 100% Atwood Oceanics Management, LP Delaware 100% ATW Management, Inc. Delaware 100% Atwood Deep Seas, Ltd. Texas 100% FOREIGN - Atwood Oceanics Drilling Pty. Ltd. Australia 100% Atwood Oceanics Australia Pty Limited Australia 100% Atwood Oceanics Platforms Pty. Ltd. Australia 100% Atwood Oceanics Services Pty. Ltd. Australia 100% Atwood Oceanics West Tuna Pty. Ltd. Australia 100% Atwood Oceanics Pacific Limited Cayman Islands, B.W.I. 100% Alpha Offshore Drilling Services Cayman Islands, B.W.I. 100% Atwood Oceanics International Limited Cayman Islands, B.W.I. 100% Swiftdrill Offshore Drilling Services Cayman Islands, B.W.I. 100% Swiftdrill, Inc. Cayman Islands, B.W.I. 100% Atwood Oceanics Leasing Limited Labuan 100% Atwood Oceanics (M) Sdn Bhd Malaysia 100% Clearways Offshore Drilling Sdn. Bhd. Malaysia 49% Drillquest (M) Sdn. Bhd. Malaysia 100% PT Alpha Offshore Drilling Indonesia 100% PT Pentawood Offshore Drilling Indonesia 80% Aurora Offshore Services Gmbh Germany 100% Swiftdrill Nigeria Limited Nigeria 60% Atwood Oceanics Services Singapore 100%