They live in the water from birth to death. Cetacean includes all 78 species of whales, dolphins and porpoises.
Whales have a number of physical features that they use to perform deep dives.
First, their blood volume is larger than land mammals, and they also have a larger capacity to store oxygen. Third, they resist carbon dioxide which causes involuntary breathing. Baleen whales hold their breath up to 50 minutes when diving. Sperm whales hold it for up to 75 minutes. Sperm whales dive up to 1500 feet in search of prey.