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