For example, at the depth of 2,723 ft, we'll reach the point where the Burj Khalifa, the tallest building in the world, would not even show its tip on the surface if it were put underwater. At 3,600 ft, there’s West Mata — one of the deepest ocean volcanoes in the world. At 7,400 ft we’ll be saying goodbye to sperm whales — this is the deepest point they can dive. And at 15,000 ft, the monsters out of your worst nightmares pop up...

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