How does the Earth work? Richard Hammond goes to the center of the planet to find out. Using a giant 3D virtual Earth, Richard peels back the layers and shows where volcanoes come from, why earthquakes happen and even where to find diamonds.

What lies at the bottom of the oceans? What would happen if the planet lost its oceans? 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.