Construction
''U-40'' was ordered by the ''Kriegsmarine'' on 29 July 1936 (as part of Plan Z and in violation of the Treaty of Versailles). Her kneel was Keel laying, laid down on 1 July 1937. ''U-40'' was Ceremonial ship launching, launched on 9 November 1938 and Ship commissioning, commissioned on 11 February 1939 under the command of ''Kapitänleutnant'' Werner von Schmidt.Design
As one of the eight original German Type IXA submarine, German Type IX submarines, later designated IXA, ''U-40'' had a displacement of when at the surface and while submerged. The U-boat had a total length of , a pressure hull length of , a beam (nautical), beam of , a height of , and a draught (ship), draught of . The submarine was powered by two MAN SE, MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of for use while surfaced, two Siemens-Schuckert 2 GU 345/34 Motor–generator, double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths of up to . The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, the boat could operate for at ; when surfaced, she could travel at . ''U-40'' was fitted with six torpedo tubes (four fitted at the bow and two at the stern), 22 torpedoes, one 10.5 cm SK C/32 naval gun, SK C/32 naval gun, 180 rounds, and a 3.7 cm SK C/30, SK C/30 as well as a 2 cm FlaK 30, C/30 anti-aircraft gun. The boat had a Ship's company, complement of forty-eight.Service history
After being commissioned and deployed, ''U-40'' was stationed in the German port city of Wilhelmshaven, which to be her home for the rest of her fairly short career.Patrols
''U-40'' left Wilhelmshaven on 19 August 1939, before World War II began, for her first patrol. For nearly four weeks she operated off the coast of Gibraltar, before returning home on 18 September that same year. ''U-40'' would once again leave Wilhelmshaven, this time under the command of ''Kapitänleutnant'' Wolfgang Barten, on 10 October 1939. During this patrol, she was to conduct Hartmann's wolfpack, joint operations off the coasts of Portugal and Spain.Fate
On 13 October 1939, ''U-40'' was sunk by a British Naval mine, mine at . She was to operate as part of the first pack of U-boats in World War II; however, because she left port late, Barten decided to take a shortcut to the U-boat's designated meeting point, southwest of Ireland. This shortcut was through the English Channel, which was festooned with many British naval Naval mine, mines. Choosing to make the voyage nearly three and a half hours after high tide, the mines were not at their lowest point. The boat struck one of these devices and sank immediately to the sea floor. Nevertheless, nine crew members were able to exit through the aft escape hatch. Using escape equipment, they were able to reach the surface; one of the nine died on his journey. Once there, five more died from exposure to the harsh elements of the English Channel. Nearly ten hours after the sinking, the remaining three men were rescued and taken prisoner of war, prisoner by .References
Bibliography
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* * {{DEFAULTSORT:U0040 German Type IX submarines U-boats commissioned in 1939 U-boats sunk in 1939 World War II submarines of Germany World War II shipwrecks in the English Channel Wreck diving sites in the United Kingdom 1938 ships U-boats sunk by mines Ships built in Bremen (state) Maritime incidents in October 1939