Things get crushed when external pressure is more than internal pressure + structure strength AND there’s no other way for the external force to get inside (read: air/water tight)
If the external pressure can force itself inside through a breach it will do that first as that is easier/less resistant. Eventually the pressure will equalize and there’s no more risk of crushing.
The titanic was filling up with water and had a rather massive breach, which became even bigger when it split in half. Water would have rushed into every opening available, equalizing the pressure very quickly.
The only things getting crushed now would be the metal itself and other structures, but there’s only so much those things can shrink.
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