... humans live under the water?

What if
… humans can live in the water?
If instead of walk and breathe with lungs, we have to use gills for breathe and swim all the time? If all people have some gills on is neck and we have webbed hands and feet?

Since ancient times, the human species imagine strange creatures and worlds in the big water. If in another dimension
Humans live in water, then we have let the Earth at the animals and plants, everywhere on the ground is clean like Mother Nature made it. There aren’t rubbish, buildings or vehicles. In opposition if the Earth was so clean, that means that the oceans are very dirty. Like a virus we have dirty all environment from the water until the flora. All thing become more grey, one year after one year or if we find another type of energy for move ourselves and materials maybe the only pollution is the waste of materials. Then the water is always clean and transparent, but a big heaps of rubbish are store in marine canyon or in beach near the sea. Or maybe we never progress enough to build what we have build until now. Maybe we remain as a dolphin or little bit more intelligent, then concentrate all our strengths on hunt, sleep and breeding for the safeguard of the Human marine species.