The German navy was the least "nazified" of any of the German war machine. They never really bought into the song and dance.Aardvark154 said:However Hitler did issue orders about this. However, they were largely ignored by U-Boat commanders (who could get away with it due to crew loyalty and the widespread belief in the Kriegsmarine that doing otherwise was immoral.)
In fact, there were several jews in the German Navy, including the admiral on the Bismark - Lutjens who was supposedly part Jewish and a German aristocrat.