Uhm...
Just what is the pre-set crash dive depth, set to, for the Balao class, by chance..???
I did a crash dive & got to 265, with it still diving... NOT knowing just where (As well as when... started getting nervous..
) it was going to stop diving, I gave orders to go to peri depth.
Know that test depth, for the Balao's is rated for 400, but the Tang, was known to have passed that, even with flooding from a damaged 'bow' (I think it was... do recall it was a torp tube, at any rate..) tube, all while doing so, to evade a destroyer. By exactly how much past 400, not sure... will have to see of doing some digging to find out if there is still available info on that.
Ain't history grand...
M. M.