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SM U-1, also known in English as the German Type U 1 submarine, was the first U-boat class of the U-boat series of submarines produced for the German Empire’s Imperial German Navy. Only one was built. The U-1 was constructed by Germaniawerft in Kiel and was commissioned on 14 December 1906. When World War I began in 1914, the U-1 was deemed obsolete and was used only for training until 19 February 1919, when it was struck by another vessel while on an exercise.
SM U-9 was a German Type U 9 U-boat. She was one of 329 submarines serving in the Imperial German Navy, and engaged in the commerce war (Handelskrieg) during World War I. Her construction was ordered on 15 July 1908 and her keel was laid down by Kaiserliche Werft in Danzig. She was launched on 22 February 1910 and commissioned on 18 April 1910.
SM U-31 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-31 was engaged in the naval warfare and took part in the First Battle of the Atlantic.
U-31 sailed from Wilhelmshaven on 13 January 1915 but disappeared shortly thereafter. She had struck a mine, and sunk with all hands lost.
The wreck of U-31 had been discovered in 2012 about 55 miles (89 km) off the coast of East Anglia during surveys made in preparation for the construction of an offshore wind farm. However, the wreck was not formally identified until 9 September 2015 when the Dutch Lamlash wreck-diving team discovered the hull number engraved on a salvaged item of navigation equipment.
SM U-118 was a type UE II mine laying submarine of the Imperial German Navy and one of 329 submarines serving with that navy during World War I. U-118 engaged in naval warfare and took part in the First Battle of the Atlantic.
SM U-118 was commissioned on 8 May 1918, following her construction at the AG Vulcan Stettin shipyard in Hamburg. She was commanded by Herbert Stohwasser and joined the I Flotilla operating in the eastern Atlantic. After four months without sinking any ships, on 16 September 1918, the SM U-118 scored her first hit. Some 175 miles (282 km) north-west of Cape Villano, the U-118 torpedoed and sank the British steamer Wellington. The following month, on 2 October 1918, she sank her second and last ship, the British tanker Arca at about 40 miles (64 km) north-west of Tory Island. The ending of hostilities on 11 November 1918 led to the subsequent surrender of the Imperial German Navy. The SM U-118 was transferred to France on 23 February 1919.