German World War II submarine
German submarine "U-691" was a Type VIIC/41 U-boat of Nazi Germany's "Kriegsmarine" during World War II. Her construction by Howaldtswerke of Hamburg was ordered on 2 April 1942, suspended on 30 September 1943, and cancelled on 22 July 1944. The new Elektro Boat XXI design had made the Type VIIs obsolete.
In fiction.
Neal Stephenson's novel "Cryptonomicon" includes a fictitious "U-691", a Type IXD/42, launched at Wilhelmshaven on 19 September 1940 (four years before IXD/42s were actually developed) and fitted with an experimental "schnorkel".
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