its fine. they can hold their breath for much longer than humans can. and they have no problems with vision, eye caps make sure of that, i think they can even smell under water.
i think this is just one of the things some of them sometimes like to do. ive seen videos of a BP diving into an aquarium and hanging out with the fish, cruising around in the water and exploring it all the way to the bottom of the tank. and yes they can stay submerged for times that seem frighteningly long to a human.
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