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Crocodiles can submerge and remain underwater for a variety of reasons. In most voluntary dives, crocodiles stay underwater for between 10 to 15 minutes. If the crocodile is trying to hide from a threat, dive length may be longer, up to 30 minutes or more.
Oxygen From Water. Some species of turtles can absorb oxygen from the water, allowing them to stay underwater for long periods of time without coming up for air. The length of time they can stay underwater depends on species and temperature. Sea turtles, for example, can remain underwater for four to seven hours at rest. Hibernating turtles can stay underwater for several months. The cloaca is an opening in a turtle's rear end where the rectum and urinary systems empty.