|Builder:||Fairfield Shipbuilding and Engineering Company, Govan|
|Launched:||29 September 1918|
|Fate:||Sunk, 9 June 1919|
|Acquired:||Raised, 11 August 1928, and repaired|
|Recommissioned:||7 August 1931|
|Renamed:||7 August 1931|
|Fate:||Scrapped c. 1960|
|Class and type:||L class submarine|
|Length:||230 ft 6 in (70.26 m)|
|Beam:||23 ft 6 in (7.16 m)|
|Draught:||13 ft 1 in (3.99 m)|
|Range:||4,500 nmi (8,300 km) at 8 kn (15 km/h; 9.2 mph)|
In 1919 L55 was sunk in the Baltic Sea by Bolshevik vessels while serving as part of the Allied intervention in the Russian Civil War. The submarine was raised in 1928 and repaired by the Soviets. After being used for training, it was finally scrapped in the 1950s.
HMS L55 was based at Tallinn, Estonia as part of the Baltic Battle Squadron which was supporting the Baltic states fighting for independence. On 9 June 1919 in Caporsky Bay in the Gulf of Finland L55 attacked two 1,260 ton Bolshevik minelaying destroyers - the Orfey-class destroyers Gavril and Azard. HMS L55 missed her targets and was forced into a British-laid minefield. Soviet sources stated that she was sunk by gunfire from the destroyer Azard. If she was sunk by gunfire, L55 would be the only British submarine to be sunk by hostile Soviet vessels.
The wreck was found by Soviet minesweepers in 1927. The Soviets raised her on 11 August 1928. As the Soviets refused to allow any British warship into their waters, the remains of 34 crew members were returned on the British merchantman Truro before transfer to HMS Champion. The crew was buried in a communal grave at Haslar Royal Naval Cemetery in Portsmouth on 7 September 1928.
The boat was rebuilt by Baltic Works, Leningrad, the reconstruction cost of 1 million roubles being financed by a public fund as "an answer to Chamberlain". She was recommissioned as a Soviet submarine with the same number (Л-55) on 7 August 1931. She was later named Bezbozhnik ("Atheist") and was used as the basis of design for the Soviet L class submarine. L55 was used for training until the beginning of World War II, when she was damaged in an accident in early 1941. She was scrapped in 1953 or possibly 1960.
- Kettle, Michael (1992). Russia and the Allies, 1917–1920. Routledge. p. 469. ISBN 0-415-08286-2.
- "Бывшая британская типа «L» III серии.". Великая Отечественная - под водой (in Russian). Retrieved 29 April 2013.
- Budzbon, Przemysław; Lemachko, Boris (January 1988). "The Salvage of HM S/M L55 by the Soviet Navy: The Reason Why". Warship (45): 4.
- Evans, A.S. Beneath The Waves: A History of HM submarine losses 1904–1971.
- "Remembrance - The Royal Navy". veterans-uk.info. Retrieved 26 June 2010.
- Hutchinson, Robert (2001). Jane's Submarines: War Beneath the Waves from 1776 to the Present Day. London: HarperCollins. ISBN 978-0-00-710558-8. OCLC 53783010.
- "Л-55", former British Type L III Series (Russian)
- V.V. Balabin, English Submarine under the flag of the USSR (Russian)
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