...but WW2 captains knew the "secret" code for the estimated/calculated crash depth which was "3xR+60" (I guess "R" was about 50 or 60). Although considered a big secret, most U-Boat men knew about this later in war.
When early in war a Type IXb (U-123 I think it was) accidently dived to 200m Dönitz laughed at the captain and said: "Glad you proved how deep our U-Boats really can go, but was it really necessary to go for the world record?"
Cheers, AS
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