U-Boat Websites

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Cipher Machines and Cryptology
  Lots of information on the Enigma.

Deutsche U-Boote 1935-1945
  Listings of u-boats etc.

German U-Boat
  Very good website on this topic.

Historisches MarineArchiv
  Lots of information on a wide variety of the German Navy

U-Boat Archive
  Online collection of U-boat records and reports.

  Everything you want to know about U-Boats, history etc. Best site to visit on this topic.