Diving Regulations for U-boats might be of interest. The translation from the German is a bit clunky, but both instructions and warnings are crystal clear.
Para. 113: "Attention must be paid to sufficient water depth"
Indeed.
The
index page links to several other docs also, including a report on the
capture and inspection of U570. which begins
Quote:
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"Graph," ex "U 570," is a 500-ton U-Boat, Type VIIC, and was built at the Blohm & Voss Yards, Hamburg. Commissioned on 15th May, 1941, with a crew consisting of 4 officers, 3 chief petty officers, 11 petty officers and 25 men, she carried out trials, mainly from Kiel and Horton, on Oslo Fjord, until about 23rd July, when, during a crash dive from a suspected British aircraft, she struck a reef and damaged her bows.
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