"10 Years and 11 Days", by Karl Doenitz
"The Uboat Commander" by Erich Topp
"The Uboat Commander" by Peter Kremer
"The Uboat Commander" by Gunter Prien
"The Uboat Commander's Handbook" BDU Staff
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
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