HMS K15 was a K class submarine built by Scotts, Greenock. She was laid down on 19 April 1916 and was commissioned on 30 April 1918. K15 sank due to an accident, when moored alongside the light cruiser at Portsmouth Harbour on 25 June 1921. She was then salved in July 1921. K15 was sold in August 1924 in Upnor. Design K15 displaced when at the surface and while submerged. It had a total length of , a beam of , and a draught of . The submarine was powered by two oil-fired Yarrow Shipbuilders boilers each supplying one geared Brown-Curtis or Parsons steam turbine; this developed 10,500 shaft horsepower (7,800 kW) to drive two screws. Submerged power came from four electric motors each producing . It was also had an diesel engine to be used when steam was being raised, or instead of raising steam. The submarine had a maximum surface speed of and a submerged speed of . It could operate at a maximum depth of and travel submerged at for . K15 was armed with ten torpedo tubes, two deck guns, and a anti-aircraft gun. The torpedo tubes were mounted in the bows, the midship section firing to the beam, and two were on a rotating mounting on the deck. Its complement was fifty-nine crew members. References Bibliography British K-class submarines Ships built on the River Clyde 1917 ships Maritime incidents in 1921 Royal Navy ship names