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What lies at the bottom of the oceans? What would happen if the planet lost its oceans? Richard Hammond is going to drain the oceans to find out. Hidden beneath all that water are some of the biggest natural formations on earth: The longest mountain ranges, the tallest volcanoes and the deepest canyons. Richard can reveal all this and more in a way never seen before, because he has the ultimate toy - a vast working 3D virtual Earth in a hangar.
