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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.
The turtle, depending on the species can hold its breath underwater for a long time. Most species can hold their breath anywhere from 30 minutes to 3 hours. How long the turtle can hold its breath is also in direct proportion to how active it is and if it is able to find pockets of air.