The deepest known point in the ocean is the Challenger Deep, which is located in the Mariana Trench in the western Pacific Ocean. The Challenger Deep reaches a depth of approximately 36,070 feet (10,972 meters) below sea level. It is part of the larger Mariana Trench, which is a crescent-shaped trench that extends for approximately 1,550 miles (2,500 kilometers). The depth of the Challenger Deep was first measured in 1960 by the bathyscaphe Trieste, piloted by Jacques Piccard and Don Walsh. Since then, subsequent expeditions and technology have confirmed and refined the depth measurement of the Challenger Deep.