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It just seems like it would be a really cool thing to have gills and be able to populate the oceans in the same way we populate the land. We could have houses and shops and vehicles, andgo on walks/swims and just kind of live underwater.
Start a whole new second species of human here on earth maybe, Who knows?
Have you been watching a fairly terrible late1990/early2000s tv series starring jessica alba? I'm pretty sure they had some fish-mutants.
I don't think you can radically change a human's environment that much faster than nature, especially not a system so critical as breathing. The whole organism (including the internal microbiome) needs to co-evolve with itself and the ecosystem it is to survive in - to function effectively as an independent organism. I don't know how long it took cetaceans to evolve, but even they still breathe air at the surface - they're really just big flappy hippos.
I'm sure it's not impossible but I think you'd need, many, maybe thousands of generations for it to become something viable that can effectively provide enough oxygen to the other systems - or more likely adapt all the other systems to less oxygen. So it might have to live basically in a lab / sea-world for centuries. You might need scientists with unusual ethical standards to get to human - but an underwater rat? I'm sure you'd find a few Dr Mephestos out there eager to drown a few thousand of those.
Source: 100% ignorant opinion.
I was just thinking there's plenty of creatures bigger than us with much more active lifestyles. And gills are kind of self-contained. Just slap them on there and away you go!
Hypothetically. 100% ignorant opinion as well.