There's this race of humanoid fish people. They live in cities built on the ocean floor of the planets they inhabit.
For some plot reason, they decided to come to Earth. In order to remain hidden, they built their advanced post in a very deep part of the ocean floor.
Their "city" is but a collection of domes with breathable air inside. But they're not made of glass - they're "force fields" that repel the water. This means that if you're inside, you can literally get out and swim (since there's nothing solid between the air and the water). Which brings us to my question.
Picture an amount of pressure that would be way more than what is necessary to kill a human being (I have no idea what this number is, so I'll just guess 1000 meters down).
Given this ridiculous amount of water pressure, what would such a death look like to a bystander?
For this, just imagine you're inside the dome and someone else gets thrown in the water in front of you, exposed to 1000 meters (or more) of water pressure. I want to know what happens to this guy.
Does he get crushed? Bleeds from all orifices? Explodes? If you could also tell me how bad it gets with even greater depths, that would be super. If 1000 meters is too low, feel free to increase it up as much as you can, as long as it's still Earth parameters.