Appeared in DIVER May 2011
Evolution has endowed some marine animals with diving abilities of which humans can only dream. Sarah Curran Ragan explains
Banded sea snake in the Philippines – these animals spend their lives in a medium in which they cannot breathe.
Elephant seals have been recorded as deep as 1500m.
Hawksbill turtles can boost oxygen levels by bringing in water through nostrils, mouths and backsides.
Sperm whales regularly dive to 1000m-plus.