The reason the Titanic isn’t crushed is because there is no air left in the ship. any air trapped in the ship was also considered open spaces where the water pressure was able to act on the pressurization of the air and compress it. The Titan is trying to maintain 1 atmosphere inside the capsule and to do this they have maintain an equil pressure from the inside as the water pressure from the outside. Any change in that equilibrium and you can have huge issue coming to the surface in the form of decompression sickness (aka the bends) or you can be crushed at depth.
FYI the pools on the Titanic (which was one of the few cruise ships to have pools), still have water in them. LOL
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