HMS K12 was a K class submarine built by Armstrong Whitworth, Newcastle upon Tyne. She was laid down in October 1915 and commissioned in August 1917. K12 took part in the Battle of May Island, surviving the disastrous exercise. K12 collided with in 1924; K2 smashed a hole in the forward casing of K12 while K2 buckled her bows for about six feet. K12 was scrapped in 1926 in Charlestown. Design K12 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 supplying one geared Brown-Curtis or Parsons steam turbine; this developed 10,500 ship 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 depths of at for . K9 was armed with ten torpedo tubes, two deck guns, and a anti-aircraft gun. Its torpedo tubes were fitted to the bows, the midship section, and two were mounted on the deck. Its complement was fifty-nine crew members. References Bibliography British K-class submarines Royal Navy ship names Ships built on the River Tyne 1917 ships Ships built by Armstrong Whitworth