The world ocean covers more than 70 percent of the planet’s surface, and around 95 percent of the ocean is unexplored.
The deepest known point on our planet the Challenger Deep in the Mariana Trench – 10,916 meters (35 814 feet).
Lake Baikal is the deepest lake in the world – 1 642 meters (5 387 feet).
The deepest point in Lake Superior is 400 meters (1,300 feet) below the surface, but Crater Lake is the deepest lake in the U.S. – 594 meters (1,949 feet).
– Great Lakes System Profile