How quickly does it happen? What kind of noise or other vibrations occur? Would occupants know as it was happening? What would be left? And all the other questions….
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I’m no physicist, but in the event of a submersible imploding from the pressure of the water, the makeup of the human body inside of it has to come into account. The weight of the water on the vessel can cause an implosion because unlike air, water cannot be compressed. (We cannot base the outcome of an underwater implosion on videos of implosion caused by air pressure)
So the vessel itself would certainly crumple immediately when the AIR within it is compressed, but in theory this implosion would stop once the pressure is equalized. Considering that the human body is primarily comprised of water and those inside are already acclimated to a higher pressure inside the vessel, the hull itself wouldn’t necessarily kill the people inside by crushing them.
Their lungs would implode, along with any pockets of air within their intestines, filling immediately with any surrouding liquid within the torso. This violent osmosis would destroy any tissue surrounding any air or other gasses within the torso, but the rest can’t and won’t take much damage at all. So I disagree with the statements going around that their death would be instant… oh no. The hull would shrink around them like it was vacuum sealed and their water-based bodies would equalize the pressure inside the shrunken metal. They’d likely feel everything that happened and be aware of the metal wrapped tightly around their compressed bodies, but they’d have a few seconds of consciousness to understand it, certainly. Even if the heart stops, the brain will still have enough non-compressable oxygen within it to operate for up to 10 seconds. Depending on what gasses were added to account for the pressure, they may have been conscious for longer.
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