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All you need to do is build an Abyss Box: https://en.wikipedia.org/wiki/Abyss_Box

Woah how does it work? I'd imagine some kind of piston where the tank is closed solid but a piston exerts a pressure? How do you transfer these animals to and from it while keeping pressure?

It uses some special pumps and valves to maintain that pressure. The volume is under five gallons so it's just a matter of building a pump big enough.

It only houses animals that can survive the brief trip from deep sea into the tank.

Would need a hyperbaric chamber.

Could you hatch the eggs at a normal pressure after slow decompression?