In 1953, a subsidiary of BP, D'Arcy Exploration Ltd, obtained an offshore concession from the ruler of Abu Dhabi. BP joined with Compagnie Française des Pétroles (later Total) to form operating companies, Abu Dhabi Marine Areas Ltd (ADMA) and Dubai Marine Areas Ltd (DUMA). A number of undersea oil surveys were carried out, including one led by the famous marine explorer Jacques Cousteau. In 1958, a floating platform rig was towed from Hamburg, Germany, and positioned over the Umm Shaif pearl bed, in Abu Dhabi waters, where drilling began. In March, it struck oil in the Upper Thamama, a rock formation that would provide many valuable oil finds. This was the first commercial discovery of the Trucial Coast, leading to the first exports of oil in 1962. ADMA made further offshore discoveries at Zakum and elsewhere, and other companies made commercial finds such as the Fateh oilfield off Dubai and the Mubarak field off Sharjah (shared with Iran).