Thought they imploded
I’m sure the Argies want to find out. If I were an Argie Sailor, I’d certainly want to know ...
Depends if it was leaking on the way down.
With the USS Scorpion, it's speculated that torpedo maintenance testing set off the motor on a torpedo. It was loaded and ejected, but it came back and hit the bow.
When the remains were found, the aft sections had telescoped forward from the pressure.