Out of the three, whales like the blue whale can cruise at pretty serious speeds and sustain speeds of 20 mph, which is probably greater than the speeds that alligators, crocodiles and shark can sustain. read more
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They can be like this for as long as the dive lasts (30-45 mins.) and are certainly not swimming. So the answer is yes, some sharks do stop swimming. The related answer below adds more clarification. read more