Hmmm. The online depth/pressure calculator I used gave me an answer in atmospheres, so I multiplied by 14 to get psi. Somehow, my meager math skills let me down again. A different online calculator gives me roughly 875 psi at 600 meters or just under 2,000 feet LINK

Math errors aside, there are a whole damn lotta square inches on a sub, so 875 psi translates to a huge amount of pressure.

Cleverly disguised as a responsible adult.