Study confirms Cuvier's beaked whale is world's deepest-diving mammal. The new data shows the whales can dive more than 4,500 feet beneath the ocean surface and can last 2-3 hours. The dives push the limits of mammalian physiology, but biologists still don't know how they're able to behave this way.

See the source article by following the link below:
Study confirms Cuvier's beaked whale is world's deepest-diving mammal. The new data shows the whales can dive more than 4,500 feet beneath the ocean surface and can last 2-3 hours. The dives push the limits of mammalian physiology, but biologists still don't know how they're able to behave this way.