Deep-sea fish adapt to some of the most extreme conditions on Earth. New research analyzing their evolution finds the same mutation across fish species that have evolved on separate timelines — ...

Consider the chilling possibility that the massive Megalodon shark is still alive and lurking in the deepest parts of the ocean.

Narrator: The Mariana Trench is the deepest point on Earth ... Now, like lobsters, these animals have hard exoskeletons made of calcium carbonate, which you normally wouldn't find down here ...