> [...]minutes warning prior to rapid decompression Do you mean rapid compression (i e. implosion)? The internal pressure in such subs is kept at roughly 1 atm

> [...]minutes warning prior to rapid decompression Do you mean rapid compression (i e. implosion)? The internal pressure in such subs is kept at roughly 1 atmosphere at all depths. The massive pressure difference at depth is why hull integrity is of the utmost importance, if it's compromised, things go south rapidly.