Buggy123
I trust you know where the happy button is?
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Normal humans can go diving at those depths, more or less.A human who can go diving at depths that would crush a normal submarine.
The inconvenient thing about submarines is that they have to keep the inside at a much lower pressure than the outside. But humans diving in water can't, and don't. Instead, we just compress so all our blood and tissues and such are at the same immense pressure as the surrounding water. You'd think that means we'd be crushed into a pulp, but as it turns out we're mostly water and other liquids, and water essentially doesn't change volume under pressure.
There's... more complex issues. Breathing gasses can get a bit weird; something something, absorption, 95% hydrogen air mixes, etc. If you had gills you'd be fineish. If you want to go REALLY deep, the pressure down there starts to interfere with a lot of the enzymes in our bodies, among other things. Solutions exist, but would require genetic modification or magic.
Overall, I'd say a baseline-resilience human with some magic and/or a biomancy-modified body could survive fine even at extreme depths. And Atlantians have both.