SM UC-107 was a German Type UC III minelaying submarine or U-boat built for the German Imperial Navy () during World War I.

Design A Type UC III submarine, UC-100 had a displacement of when at the surface and while submerged. She had a length overall of , a beam of , and a draught of . The submarine was powered by two six-cylinder four-stroke diesel engines each producing (a total of ), two electric motors producing , and two propeller shafts. She had a dive time of 15 seconds and was capable of operating at a depth of .

The submarine was designed for a maximum surface speed of and a submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . UC-100 was fitted with six mine tubes, fourteen UC 200 mines, three torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one SK L/45 or Uk L/30 deck gun . Her complement was twenty-six crew members.

Construction and career The U-boat was launched on 2 June 1918 and completed on 30 November 1918. Because UC-107 was finished after the end of fighting, she was never commissionedd into the German Imperial Navy; had she been so commissioned, she would have been named SM UC-107."SM" stands for "Seiner Majestät" () and combined with the U for Unterseeboot would be translated as His Majesty's Submarine. UC-107 was awarded to the United Kingdom as a war reparation and broken up in 1921.

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