Pressure is an issue and it would be a difficult obstacle to overcome just based on the materials and design of most aquariums. Another obstacle however is temperature, at the depths you are talking about the ocean is roughly 0 degrees celsius. For reference I have a 100 gallon salt water tank where the fish all need the water at 26 degrees celsius, granted they are all considered tropical. I have yet to see an aquarium chiller that can lower a tank temperature to 0, although that doesn’t mean they don’t exist.
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