Drain The Ocean

This is a world you have never seen before, a landscape normally hidden under miles of water: the ocean floor. Combining the latest scientific data with state of the art computer hardware and specially written software, we drain the water from the oceans to reveal the mountains, canyons, plains, and volcanoes that are more dramatic than anything on dry land.
(Source: http://channel.nationalgeographic.com/episode/drain-the-ocea)