Historically, and in real life, going below crush depth means the sub will implode, which is instant death and you're compressed with the inside of the sub like crushing a tin can.
To be realistic, when crush depth happens, you should hear a huge explosion as the sub implodes with the screen turning red and black in one second, and you're dead.
There should be gradual damage, but when the crush happens, it's over in one second or so.
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