Breeding modern humans

What if some people were put in the sea from birth, and had children in the sea, for several generations. This kind of sea-based evolutionary kickstarter, would presumably lead to a more advanced, semi-aquatic version of the human. Liquid-dwelling humans would be suitable for space flight, and, also, conquering the oceans.

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more advanced

Debatable. Maybe in strength. And penis size. And style. And rhythm. And ability to attract white women. And masculinity. But not where it counts.