The British L-class submarine was originally planned under the emergency war programme as an improved version of the British E-class submarine. The scale of change allowed the L class to become a separate class.
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 K4 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 Blonde, followed by K1, K3, K4, and K7. 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.
HMS K2 was the second of the K class submarines and was built at HM Dockyard, Portsmouth, England. She was laid down on 13 November 1915 and was commissioned in May 1917 one year before the end of World War I. In January 1917, K2 was damaged by an explosion and fire during her first diving trials. On 11 January 1924, it collided with K12 as they departed Portland Harbour. K2 smashed a hole in the forward casing of K12 and buckled her bows for about 6 feet (1.8 m).
HMS K6 was a British K class submarine built by HM Dockyard, Devonport. She was laid down on 8 November 1915 and commissioned in May 1917. K6 was the first of the K class to have its bows raised by converting it into a bulbous swan shape.
HMS K7 was a K class submarine built by HM Dockyard, Devonport. She was laid down on 8 November 1915 and commissioned in July 1917.
HMS K16 was a K class submarine built by William Beardmore and Company, Dalmuir. She was laid down in June 1916 and commissioned on 13 April 1918.
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.
HMS K8 was a British K class submarine built by Vickers, Barrow-in-Furness. She was laid down on 28 June 1915 and was commissioned on 6 March 1917. K8 was sold on 11 October 1923. It had a complement of fifty-nine crew members and had a length of 338 feet (103 m).
HMS K9 was a K class submarine built by Vickers, Barrow-in-Furness. K9 was laid down on 28 June 1915. She was commissioned on 9 May 1917. In 1921, K9 was placed in reserve. K9 was sold in Charlestown on 23 July 1926. It had a complement of fifty-nine crew members and a length of 338 feet (103 m).
HMS K10 was a K class submarine built by Vickers, Barrow-in-Furness. She was laid down on 28 June 1915. She was commissioned on 26 June 1917. K10 was sold on 4 November 1921. K10 foundered in tow on 10 January 1922. It had a complement of fifty-nine crew members and a length of 338 feet (103 m)
HMS K11 was a K class submarine built by Armstrong Whitworth, Newcastle upon Tyne. K11 was laid down in October 1915, and commissioned in February 1917. It had a complement of 59 crew members.
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.
HMS H2 was a British H-class submarine built by Canadian Vickers, Montreal. She was laid down on 11 January 1915 and was commissioned on 4 June 1915. After commissioning, H2 crossed the Atlantic from St. John's, Newfoundland to Gibraltar escorted by the armed merchant cruiser HMS Calgarian. She was accompanied by H1, H3 and H4. H2 was sold in Malta on 7 March 1921.
HMS H7 was a British H-class submarine built by the Canadian Vickers Co, Montreal, Quebec, Canada. She was laid down on 19 May 1915 and was commissioned in June 1915. HMS H7 was sold in 1921. It had a complement of twenty-two crew members, a length of 171 feet (52 m), and a surfaced range of 1,600 nautical miles at 10 knots.
HMS H9 was a British H-class submarine built by the Canadian Vickers Co., Montreal. She was laid down on an unknown date and commissioned in June 1915. Launched by J. Grace Gardner at Montréal on 22 May 1915.
HMS H10 was a British H-class submarine built by the Canadian Vickers Co., Montreal. She was laid down on an unknown date and was commissioned in June 1915.
HMS L33 was a British L-class submarine built by Swan Hunter, Wallsend, laid down in September 1917, launched in May 1919, and completed in December 1920. She was armed with six torpedo tubes, and had a top speed of 17 knots while surfaced. She had an uneventful career that included a deployment to the China Station in 1928. Obsolescent by the early 1930s, L33 was sold in February 1932 and broken up.
HMS K17 was a British K class submarine built by Vickers in Barrow-in-Furness.
The Alarm-class torpedo gunboat was the penultimate class of torpedo gunboat built for the Royal Navy. The class was contemporary with the early torpedo boat destroyers, which were faster and thus better suited to pursuit of enemy torpedo boats. By World War I the class had either been sold, converted to submarine depot ships or minesweepers, or reduced to harbour service. Three of the class were lost during World War I while serving in the minesweeping role.
The Russian submarine AG-11 was an AG-class submarine, designed by the American Holland Torpedo Boat Company/Electric Boat Company, built for the Imperial Russian Navy during World War I. The submarine was fabricated in Canada, shipped to Russia and reassembled for service with the Baltic Fleet.
United Kingdom