German submarine U-691
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Template:Infobox ship imageTemplate:Infobox ship careerTemplate:Infobox ship characteristicsGerman 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.<ref>Template:Cite web</ref> The new Elektro Boat XXI design had made the Type VIIs obsolete.
In fiction
[edit]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.