If a rupture occurs at significant depth, those onboard would hear a series of pops and start seeing water rushing in to fill the void, or everything could go at once and depressurize causing instant death. The latter being the overwhelmingly preferred choice if at great depths. The occupants would need to be in a hallucinatory state or shock to not know what is going on. What would be left is everything minus the air that escaped. The wreckage left to drift in the currents until buried or found.
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