HMS K1 was a First World War steam turbine-propelled K-class submarine of the Royal Navy. K1 was sunk to prevent it being captured after colliding with off the Danish coast. She had been patrolling on the surface as part of a flotilla of submarines operating in line ahead. The flotilla was led by the light cruiser , followed by K1, , K4, and . The crew survived and taken off by two cutters sent from HMS Blonde. The collision occurred at approx 17:35 and after consultation with the rescued submariner officers and concluding that the K1 could not be saved, Blonde opened fire with one of her 4 inch guns and sank the submarine with a few shells at 19:10 hours. Design K1 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 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 . K1 was armed with ten torpedo tubes, two deck guns, and a anti-aircraft gun. Its torpedo tubes were four in the bows, four in the midship section firing to the sides, and two were mounted on the deck in rotating mountings. Its complement was fifty-nine crew members. References External links 'Submarine losses 1904 to present day' - Royal Navy Submarine Museum British K-class submarines British submarine accidents World War I shipwrecks in the North Sea 1916 ships Maritime incidents in 1917 Submarines sunk in collisions Ships built in Portsmouth Royal Navy ship names Scuttled vessels of the United Kingdom Submarines sunk by submarines