Transocean Ltd. provides offshore contract drilling services for oil and gas wells worldwide. It offers deepwater and harsh environment drilling, oil and gas drilling management, and drilling engineering and drilling project management services. The company also offers well and logistics services. In addition, it engages in oil and gas exploration, development, and production activities primarily in the United States offshore Louisiana and Texas, and in the United Kingdom sector of the North Sea. As of February 10, 2011, the company owned, had partial ownership interests in, and operated 138 mobile offshore drilling units, including 47 high-specification floaters, 25 midwater floaters, 9 high-specification jackups, 54 standard jackups, and 3 other rigs, as well as 1 ultra-deepwater floater and 3 high-specification jackups under construction. Transocean Ltd. was founded in 1953 and is based in Zug, Switzerland.