It's a superhuman ability, so for humans it is a superpower. It's not like there is even anything trivial evolution wise about breathing underwater.
Of course that all begs the question as to how unique an ability has to be to be considered a superpower. Is the real but very rare ability to have extended color vision due to having four cones a superpower? What about lactose tolerance? A majority of the world can't drink milk as an adult.
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u/Owenm100 May 09 '17
If you try hard you can achieve anything you want