A former NASA employee, James O’Donoghue, has released an amazing animation which shows how the look of the planet would change if all the oceans – covering three fifths of its surface – gradually drained away.
As the sea level drops, the continental shelves appear immediately. They are mostly visible by a depth of 140 meters, except for the Arctic and Antarctic regions, where the shelves are deeper. The mid-ocean ridges start to appear at a depth of 2000 to 3000 meters. By 6000 meters, most of the ocean is drained except for the deep ocean trenches, the deepest of which is the Marianas Trench at a depth of 10,911 meters.
Interested in playing around more with sea levels? Here is an interesting website that allows you to change sea level to anything you want, both above and below current.