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….
In: 88
Very very very quickly. Fractions of a second. The pressure is so high, and the mass of the sub walls so small, that the acceleration once the structure gives way is *extremely* high.
There are audio recordings of subs being crushed; those are typically longer processes because normal submarines operate *far* shallower (less pressure). It will make a very distinctive sound but, depending on the depth, that sound may never get to anything that can hear/record it.
What would be left would depend on how the structure failed. If the pressure hull buckled, you’d basically have a flat pancake of hull as the water pressure smashed it flat, with the contents of the hull filling in any (very small) remaining gaps).
If something like a door or window failed, the hull would be intact but the content would be pulverized by the in-rushing water.
Either of the above would likely happen too fast for the occupants to realize.
If they just sprung a leak (not an implosion), they could have seconds/minutes/hours depending on the scale of the leak. In that case the pressure would come up relatively slowly and the whole thing could be intact, just full of water.
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