Which whale is known for the deepest recorded dive by a mammal?

Cuvier's beaked whale is the whale known for the deepest recorded dive by a mammal.

A tagged Cuvier's beaked whale reached approximately 2,992 metres during a dive recorded in 2014, making it the deepest documented dive by any mammal. The same species has also been recorded remaining underwater for more than two hours. These extraordinary performances occur in the deep ocean, where the whales search for squid and other prey using echolocation.

Cuvier's beaked whales are relatively small compared with many familiar whales, reaching roughly 7 metres in length. They have a compact body, a sloping forehead, and a short beak. Their deep-diving ability is linked to adaptations such as high oxygen stores in blood and muscle, collapsible lungs, and tolerance of pressure.

Sperm whales are also exceptional deep divers, so they are a common mix-up. However, the deepest published mammal dive record belongs to Cuvier's beaked whale, not the sperm whale.