"Sea snakes have astonishing aquatic adaptations, like valved nostrils to seal in air, lungs that can hold a breath for hours, and skin that flushes nitrogen to beat the bends, but they do have to surface to breathe once in a while."
From an article by Daniel Duane in National Geographic's adventure, September 2005.
I will add about sea snakes that, like Indy, they make me rather nervous...
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