"Uboat Commander" by Peter Ali Cremer
"Uboat Commander" by Erich Topp
"Uboat Comnander" by Gunter Prien
"Eleven Years and Twenty Days" by Karl Doenitz[/list]
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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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