Titan vessel imploded in deepsea, how come deepsea fish are able to survive with unbelievable pressure undersea

The Titan vessel imploded in deepsea because it had air pockets inside it that could not withstand the high hydrostatic pressure of the water. The pressure increases by 1 atm for every 10 meters of depth, so at the depth of about 4 km where the Titan sank, the pressure was about 400 times greater than at the surface. This caused the air pockets to colla…