Transocean goes deep below the ocean surface in search of major profits. The company specializes in deepwater drilling and it isn't afraid of harsh environments. It operates in the world's major offshore oil-producing regions, including Africa, Asia, Brazil, Canada, India, the Middle East, the Gulf of Mexico, and the North Sea. The company has a fleet of 138 mobile offshore drilling units (72 semisubmersibles and drillships, 63 jackup rigs, and three other rigs). Transocean's other operations include management of third-party drilling services. Major customers include BP and Chevron. Although Transocean has a major presence in the Houston oil patch, the company is domiciled in Switzerland for tax purposes.