I think it is quite unlikely that we live underwater in a natural way (without the help of technology). Humans have evolved out of the oceans and that why our bodies look the way they do. If eventually humans were to conquer the oceans like primitive mammals did (that’s how dolphins and whales appeared) It would end up being a completely different species, so I don’t think humans like us could live underwater (unless we build big cities in bubbles so we can breathe)
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