Sea Turtles are expert freedivers. Turtles can rest or sleep underwater for several hours at a time but submergence time is much shorter while diving for food or to escape predators. Breath-holding ability is affected by activity and stress, which is why turtles drown in shrimp trawls and other fishing gear within a relatively short time.
[ame=http://www.youtube.com/watch?v=X0cVrsljZes]Freediving with an Expert - YouTube[/ame]
[ame=http://www.youtube.com/watch?v=X0cVrsljZes]Freediving with an Expert - YouTube[/ame]