You really have to qualify this when you discuss absolute times.
There is a book procedure for diving a boat, and then there is the "combat zone" procedure used by many of the experienced skippers and crews.
The former required, for example, a green board before any vents were opened, and other operational safety-first considerations.
The latter, on the other hand, included such irregularities as opening the vents while the conning tower hatch and the main induction were still open, and running on the surface, as a matter of course, with the negative tank already flooded... both of which would get you canned for sure during peace time.
But during war time.... that shaved the dive time (from dive order to sheers under) from 100 seconds or more to under 40, as I understand it.
JD
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