Actually, it is > 3,900 meters (13,000 ft).
More importantly, the pressure is 378 Atmospheres, or 378 times pressure at the sea surface. Some may find that 5,562 psi is more meaningful, but remember a lot of the composites that have been carried to the bottom will have had any residual softness compacted, and the same goes for anything else. Tyres (tires) on the landing gear will have deflated at the rims once the pressure exceeded that to which they had been inflated. Water will be occupying that space.