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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.
Active animals can not stay under that long because they are using more oxygen. Harbor seals usually do not dive any longer than three or four minutes, and sea turtles typically do not stay under for more than five to ten minutes.