Ocean Rig UDW Inc., an offshore drilling contractor, through its subsidiaries, provides oilfield services for offshore oil and gas exploration, development, and production drilling. It specializes in the ultra-deepwater and harsh-environment segment of the offshore drilling industry. The company owns and operates 11 offshore ultra deepwater drilling units comprising 2 ultra deepwater semisubmersible drilling rigs and 9 ultra deepwater drillships. Ocean Rig UDW Inc. primarily serves oil companies, integrated oil and gas companies, state-owned national oil companies, and independent oil and gas companies. The company is based in Nicosia, Cyprus. Ocean Rig UDW Inc. is a subsidiary of DryShips Inc.