collapse depths in the range of 200 to 280 metres test depth crush depth crush depth crush depth 試験深度 https://en.wikipedia.org/wiki/Submarine_depth_ratings crush depth Calculated crush depth estimated collapse-depth Depth Ratings Submarine depth ratings en.wikipedia.org... crush depth design depth Collapse depth collapse depths in the range of 200 to 280 metres 計算による圧壊深度