Transocean Ltd. provides offshore contract drilling services for oil and gas wells. The company operates through Contract Drilling Services segment. The Contract Drilling Services segment comprises mobile offshore drilling fleet, related equipment and work crews primarily on a day rate basis to drill oil and gas wells. It operates technically demanding regions of the offshore drilling business with a particular focus on deepwater and harsh environment drilling services. The segment consists of floaters, jack-ups and other rigs used in support of offshore drilling activities and offshore support services on a worldwide basis. The company was founded in 1954 and is headquartered in Vernier, Switzerland.