SM UB-18

SM UB-18 was a German Type UB II submarine or U-boat in the German Imperial Navy during World War I. The U-boat was ordered on 30 April 1915 and launched on 21 August 1915. She was commissioned into the German Imperial Navy on 11 December 1915 as SM UB-18. The submarine sank 126 ships in 31 patrols for a total of 129,782 gross register tons  making her the 13th most successful U-boat in both world wars. UB-18 was rammed by the trawler Ben Lawer and sunk in the English Channel at 49°17′N 5°47′W on 9 December 1917.
A German Type UB II submarine, ‘’UB-18’’ had a displacement of 263 tonnes when at the surface and 292 tonnes while submerged. They had a length overall of 36.13 m , a beam of 4.54 m , and a draught of 3.70 m . The submarine was powered by two Daimler six-cylinder four-stroke diesel engines each producing 142 metric horsepower ), two Siemens-Schuckert electric motors producing 280 metric horsepower , and one propeller shaft. She had a dive time of 45 seconds and was capable of operating at a depth of 50 metres .

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