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[bigboywooly]

If IIRC the I 400 had like a tube the watch crew dived into that would take them down to the control room as was such a long way down

Will have to find that info again

EDIT

Found it

Another of I-400's noteworthy design features was the long vertical trunk leading down from the conning tower outside the hangar to the control room. With a diving time of 56 seconds, the bridge watch leaped into spectacular action on the command Clear the Bridge! The lookouts had to jump down the conning tower hatch, then hurtle through this long tube to man their diving stations in the control room 25 feet below (Figure 3). To cushion the landing impact a three foot thick canvas hassock was positioned in the control room at the foot of the conning tower ladder.

http://www.pacerfarm.org/i-400/