How The Ocean Works on Instagram: "When a submarine or submersible goes deeper than its hull can withstand, the enormous external water pressure (which rises by about 1 atmosphere every ~10 meters) squeezes the pressure hull inward. If the hull material or joints fail, the collapse is not a slow crushing but a near-instantaneous implosion: the surrounding water rushes in, the hull collapses inward in milliseconds, and the rapid adiabatic compression of any trapped air and structural parts releas