From "Unbroken, the true history of a submarine" by Alastair Mars:
Quote:
There were only three of us in the bridge-myself and the two lookouts- and with good reason. In a crash-dive you start to go down immediately the klaxon sounds, and you permit yourself only fifteen seconds in which to submerge. These fifteen seconds allow just enough time for three men on the bridge to get below and close the hatches above them before the boat goes under [...]
(There were times when the Unbroken completed the operation in twelve seconds!)
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Applicable to a U-Class boat.