e/Submarine depth ratings

Information
has gloss	eng: A submarine's depth ratings are primary design parameters and measures of its ability. The depths to which submarines can dive are limited by the strengths of their hulls. As a first order approximation, each ten meters (thirty-three feet) of depth puts another atmosphere (1 bar, 14.7 psi, 100 kPa) of pressure on the hull, so at 300 meters (1000 feet), the hull is supporting thirty atmospheres (30 bar, 441 psi, 3000 kPa) of water pressure. Note: The one atmosphere of air pressure at sea level is balanced by the roughly 1 atmosphere maintained inside the sub, so it does not normally strain the hull.
lexicalization	eng: Submarine depth ratings
instance of	e/Pressure vessel