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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.
Laid down in Bremen and completed in June 1943, the boat was a long-range Type IX, with four bow and two stern torpedo tubes and a Focke-Achgelis Fa 330 Bachstelze cable-towed lookout gyroglider.