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Long ago, I was a midshipman on a submarine. The crew LOVED to watch submarine disaster films - with water spraying in all frothy and fire-hosey. But the reality would be a flooding time measured in fractions of a second, in most cases - people are not used to dealing with pressures in the tons per square inch except at the nozzle of pressure washers where the flow is tiny. So, on the bright side, most submarine failure deaths are quick ones.
at 9000 feet deep, the pressure is 273 atmospheres or 4100 psig - they never knew what hit them.