Diesel electric submarine class
Russian
Black Sea Fleet Improved Kilo–class submarine
B-265 Krasnodar in 2015
Class overview Builders Operators SeeOperators Preceded by Tango class Succeeded by Lada class Subclasses Sindhughosh classBuilt 1980–present In service 1980–present In commission December 1980–present Completed 75 Active 57 Lost 1 Retired 16 Preserved 1 General characteristics Type Attack submarine Displacement Surfaced: 2,325 (Project 877) – 2,350 (Project 636.3) tonsSubmerged: 3,075 tons full load (Project 877); 3,950 tons full load (Project 636.3)[ 1] [ 2] Length 72.6 m (238 ft 2 in) (Project 877); 73.8 m (242 ft 2 in) (Project 636.3) Beam 9.9 m (32 ft 6 in) Draft 6.2 m (20 ft 4 in) Installed power Diesel-electric Propulsion Diesel-electric propulsion 2 × 1000 kW dieselgenerators 1 × 5,500–6,800 shp (4,100–5,100 kW) propulsion motor 1 × fixed-pitch 6-bladed (Project 877) or 7-bladed (Project 636)propeller Speed Surfaced: 17 knots (31 km/h; 20 mph)Submerged: 20 knots (37 km/h; 23 mph)Range With snorkel: 6,000–7,500 nmi (11,100–13,900 km; 6,900–8,600 mi) at 7 kn (13 km/h; 8.1 mph)Submerged: 400 nmi (740 km; 460 mi) at 3 kn (5.6 km/h; 3.5 mph)Full run: 12.7 nmi (23.5 km; 14.6 mi) at 21 kn (39 km/h; 24 mph)Endurance 45 days Test depth Operational: 240 m (790 ft)Maximum: 300 m (980 ft)Complement 52 Armament
Russian Project 877 in the English Channel in 2018 A Russian Kilo-class submarine underway on the surface TheKilo-class submarines are a group ofdiesel-electric attack submarines designed by theRubin Design Bureau [ 1] [ 3] [ 4] in theSoviet Union in the 1970s and built originally for theSoviet Navy . Since it was introduced, more than 70 Kilo class boats have been built, and around 60 were in active service as of 2023, not only in Russia but also in Algeria, Vietnam, India, Iran, Myanmar, and Poland.[ 5]
The first version had the Soviet designationProject 877Paltus (Russian :Па́лтус , meaning "halibut "),NATO reporting name Kilo .[ 6] They entered operational service in 1980 and continued being built until the mid-1990s, when production switched to the more advancedProject 636Varshavyanka variant, also known inthe West as theImproved Kilo class.[ 7] [ 8] [ 9] The design was updated again by the Russian Navy in the mid-2010s, to a variant calledProject 636.3 , also known asImproved Kilo II .[ 6] Due to the delays and other problems with the successorLada -classsubmarine , the Improved Kilo II has been built in larger numbers, with several more units under construction as of 2023.[ 5]
The Project 877 attack submarines were mainly intended foranti-shipping andanti-submarine operations in relatively shallow waters. Original Project 877 boats are equipped with Rubikon MGK-400 sonar system (withNATO reporting name Shark Gill), which includes a mine detection and avoidance sonar MG-519 Arfa (with NATO reporting name Mouse Roar).
Newer Project 636 boats are equipped with improved MGK-400EM, with MG-519 Arfa also upgraded to MG-519EM. MGK 400E can detect submarines with 0.05 Pa/Hz noisiness in 16 km (9.9 mi) and surface vessels with 10 Pa/Hz noisiness in 100 km (62 mi).[ 10] The improved sonar systems have reduced the number of operators needed by sharing the same console via automation.
Anechoic tiles are fitted on casings and fins to absorb the sound waves of active sonar, which results in a reduction and distortion of the return signal.[ 11] These tiles also help attenuate sounds that are emitted from the submarine, thus reducing the range at which the submarine may be detected bypassive sonar .[ 12]
Project 636 and 636.3 submarines can launchKalibr (and their Club export version) cruise missiles. It was reported in September 2022 that they can carry four Kalibr missiles, and can launch them through two of their six torpedo tubes.[ 13]
A single Project 877 submarine,B-871 Alrosa , is equipped withpump-jet propulsion, instead of apropeller .[ 14] It has been retrofitted for the Kalibr missile.[ 15]
It was planned for Project 636 (Improved Kilo) to be succeeded by theLada class inRussian Navy service. However, by November 2011 it was apparent that the Lada class would be delayed becauseSankt Peterburg (B-585), the lead boat of the class, had shown major deficiencies. On 27 July 2012, the Russian Navy commander-in-chief announced that construction of the Lada-class submarines would resume, having undergone design changes.[citation needed ] Series production was reported to be underway in the latter 2010s.[ 16] [needs update ]
The Russian Navy also moved forward in the late 2010s, with the construction of Project 636.3, also known as Improved Kilo II. The first-in-class was namedPetropavlovsk-Kamchatsky (PPK) and was launched by the head ofAdmiralty Shipyard Alexander Buzakov on 28 March 2019, or some thirty months after commission.[ 1] By November 2019, six units had been built for theBlack Sea Fleet and further boats were proposed, but not funded, for the Pacific and Baltic Fleets.[ 4]
In June 2022, an unconfirmed report from within Russia's defense industry suggested that a further tranche of six additional Project 636.3 vessels might be ordered to start construction in around 2024.[ 17] The class "is slightly longer in length — the sub's submerged displacement is around 4,000 tons — and features improved engines, an improved combat system, as well as new noise reduction technology; it can fire both torpedoes andcruise missiles , launched from one of six 533-millimeter torpedo tubes."[ 1] The class has a seven-bladed propeller, instead of the six-bladed propeller of the Project 877 class.[ 15]
Schematic drawing of Kilo-class submarine There are several variants of the Kilo class. The information below is the smallest and largest number from the available information for all three main variants of the boat.[ 18]
Displacement:2,300–2,350 tons surfaced 3,000–4,000 tons submerged Dimensions:Length: 70–74 meters Beam: 9.9 meters Draft: 6.2–6.5 meters Maximum speed10–12 knots surfaced (18–22 km/h) 17–25 knots submerged (31–46 km/h) Propulsion: Diesel-electric 5,900 shp (4,400 kW) Maximum depth: 300 meters (240–250 meters operational) Endurance400 nautical miles (700 km) at 3 knots (6 km/h) submerged 6,000 nautical miles (11,000 km) at 7 knots (13 km/h) snorkeling (7,500 miles for the Improved Kilo class) 45 days sea endurance Armament Crew: 52 Price per unit is US$200–250 million (China paid about US$1.5–2 billion for 8 Project 636 Kilo-class submarines)[when? ] [citation needed ] Operational history [ edit ] Kilo-class attack submarines originally began entering service with theSoviet Navy from 1980.[citation needed ]
At the beginning of 2014, the Chinese PLA Navy held an emergency combat readiness test.[ 19] The Kilo-class submarineYuanzheng 72 , deployed on a combat readiness voyage encountered a "cliff" caused by a sudden change in seawater density. Because the seawater density suddenly decreased, the submarine lost its buoyancy and rapidly descended. The pressure on the submarine increased sharply, and the main engine room pipeline was damaged, and water entered. The vessel lost power due to a large amount of water entering the main engine room. The crew reacted quickly, and the submarine resurfaced in three minutes, avoiding a disastrous descent to theseabed , which was more than 3,000 metres (9,800 ft) deep. The voyage was notable for creating many firsts for PLAN's submarine service.[ 20] [ 21]
In 2015, five Kilo-class submarines were deployed to theRussian naval facility in Tartus , Syria. At least two of the units reportedly attacked land targets inside Syria with 3M54 Kalibr cruise missiles (NATO designation: SS-N-27A "Sizzler").[ 4] 8 December 2015 marked the first time a Kilo-class submarine fired cruise missiles against an enemy.Rostov-na-Donu struck two targets near theISIS capital ofRaqqa by the missile attack.[ 22] TheB-237 Rostov-on-Don transited theDardanelles on its way back to theBlack Sea on 12 February 2022.[ 23]
B-871 Alrosa , a pump-jet Kilo class, which derives from the Project 877 hull, participated in theRusso-Ukraine War .
Since the start of theRussian invasion of Ukraine in 2022, the Kilo class submarines of the Black Sea Fleet have participated in the conflict, firing Kalibr cruise missiles into Ukraine.[ 5] After the sinking of theRussian cruiser Moskva in April 2022, it was remarked that the Kilo-class subs were the only members of the Black Sea Fleet whose orders did not prohibit venturing into Ukrainian waters nearOdesa during theRussian invasion of Ukraine .[ 24] In September 2022, after the early2022 Crimea attacks , the UKMinistry of Defence said that the Kilo-class submarines were moved from Sevastopol to thePort of Novorossiysk inKrasnodar Krai .[ 25] [ 13]
On 13 September 2023,B-237 Rostov-on-Don was severely damaged by a UkrainianStorm Shadow missile strike while it was drydocked in Sevastopol.[ 26] [ 27] [ 28] According to satellite images taken in June 2024, the submarine was moved to a lesser used dry dock within the port (at coordinates 44.609975029014116, 33.537496816089906). Camouflage nets were, at least initially, thrown up to disguise its presence and to make observation more challenging. According to reports, the submarine is under repair.[ 29]
On 2 August 2024, Ukrainian Forces launched a strike against a Russian submarine and anS-400 air defense system inCrimea . Ukrainian sources claimed that the submarineB-237 Rostov-on-Don was "sunk on the spot" in the attack.[ 30] [ 31] [ 32] [ 33] [ 34] Other sources claim that the submarine was only hit and not sunk.[ 35] Satellite images showed the that camouflage nets were burned out by the strike.[ 36]
In September 2025, the Project 636.3 boat,Novorossiysk (B-261), reportedly suffered serious damage as the result of a fuel system malfunction while operating in the Mediterranean.[ 37]
The first submarine entered service in theSoviet Navy in 1980, and the class remains in use with the Russian Navy today; around 5 original Kilo-class vessels believed to still be in active service with the Russian Navy (as of 2025), while new Improved Kilo–class subs are being delivered through the 2020s to replace them. About forty vessels have been exported to several countries:
Possible purchasers [ edit ] The government of Venezuela expressed interest since 2005 in acquiring nine AIP-powered conventional submarines, either the German U214 or later the Amur 1650. There was a Russian counteroffer due to technical issues at the shipyards back then, for five Project 636 Kilo-class and four Amur 1650, but it hasn't gone through yet.[ 60]
In 2017, thePhilippine Navy showed interest in the Kilo-class submarine as part of its modernization program. Defense SecretaryDelfin Lorenzana said the country was evaluating a Russian offer.[ 61]
TheIndonesian Navy was interested in purchasing two used Kilo-class submarines, but theChief of Staff of the Indonesian Navy Laksamana Marsetio cancelled the plans in 2014 after inspecting the two submarines in Russia with an Indonesian Navy team. He said, "The submarines look good on the outside, but the inside is filled with broken equipment, and the two submarines have been in storage for two years." Indonesia instead bought sixImprovedJang Bogo -class submarines, later known asNagapasa -class submarine, including a transfer of technology, where Indonesia will eventually build four of six of the submarines with South Korea.[ 62]
Russian Kilo-class submarines in
Polyarny , Murmansk Oblast
A Chinese Kilo-class submarine being delivered from Russia as deck cargo in 1995.
ORPOrzeł , the control room of an 877E-class submarine
The Iranian Kilo-class submarineYunes , during delivery in 1995.
Indian Kilo-class submarine, INSSindhughosh
Diesel submarine Kilo-classKaluga returns from a long voyage
Russian Improved Kilo-class submarineUfa during the Russian Navy Day parade in 2023.
Operator # Name Shipyard Project Laid down Launched Commissioned Fleet Status Russia B-248 — Komsomolsk-on-Amur 877 16 March 1980 12 September 1980 31 December 1980 Decommissioned 2001 Russia B-260 Chita Komsomolsk-on-Amur 877 22 February 1981 23 August 1981 30 December 1981 PF Decommissioned 2013, sank partially on way to scrap in 2019 Russia B-227 Vyborg Komsomolsk-on-Amur 877 23 February 1982 16 September 1982 23 February 1983 BF Decommissioned 2018 (exhibit of the Patriot park in Kronstadt) Russia B-229 — Komsomolsk-on-Amur 877 23 February 1983 15 July 1983 30 October 1983 Decommissioned 2002 Russia B-404 — Komsomolsk-on-Amur 877 7 May 1983 24 September 1983 30 December 1983 Decommissioned 2002 Russia B-401 Novosibirsk Nizhniy Novgorod 877 6 October 1982 15 March 1984 30 September 1984 NF Decommissioned 2012 Russia B-402 Vologda Nizhniy Novgorod 877 24 August 1983 29 September 1984 30 December 1984 NF Decommissioned 2016 Russia B-405 (ex Tyumenskiy Komsomolets ) Komsomolsk-on-Amur 877 20 April 1984 21 September 1984 30 December 1984 Decommissioned 2002 Poland 291 (ex-B-351) Orzeł Nizhniy Novgorod 877E 29 September 1984 7 June 1985 29 April 1986 Active as of 2010[update] Romania 581 (ex-B-801) Delfinul Nizhniy Novgorod 877E 1984 1985 August 1985 Unknown (in reserve since 1995) India S55 Sindhughosh Saint Petersburg 877EKM 29 May 1983 29 July 1985 25 November 1985 Active as of 2010[update] , modernized to project 08773 in 2002–2005 Russia B-470 — Komsomolsk-on-Amur 877 6 May 1985 27 August 1985 30 December 1985 Decommissioned 2005 Russia B-806 Dmitrov Nizhniy Novgorod 877EKM[citation needed ] 15 October 1984 30 April 1986 25 September 1986 BF Active as of 2018[update] [ 63] India S56 Sindhudhvaj Saint Petersburg 877EKM 1 April 1986 27 July 1986 25 November 1986 Decommissioned on 16 July 2022.[ 64] Algeria 012 Rais Hadj Mubarek Nizhniy Novgorod 877EKM 1985 1986 29 November 1986 Upgraded in 2010, able to launchKalibr/Club missiles Russia B-439 — Komsomolsk-on-Amur 877 4 April 1986 31 July 1986 30 December 1986 Decommissioned 2005 India S57 Sindhuraj Nizhniy Novgorod 877EKM 1986 1987 2 September 1987 Active as of 2010[update] , modernized to project 08773 in 1999–2001 Algeria 013 El Hadj Slimane Nizhniy Novgorod 877EKM 1986 1987 25 November 1987 Upgraded in 2011, able to launch Kalibr/Club missiles Myanmar 71 UMS Minye Theinkhathu (ex-Sindhuvir)Saint Petersburg 877EKM 15 May 1987 13 September 1987 25 December 1987 Modernized to project 08773 in 1997–1999, transferred toMyanmar Navy in 2020 Russia B-445 Svyatoi Nikolai Chudotvorets Komsomolsk-on-Amur 877 21 March 1987 26 September 1987 30 January 1988 PF May have decommissioned 2020;[ 65] listed as still in service by one source[ 66] India S59 Sindhuratna Nizhniy Novgorod 877EKM 1987 1988 14 August 1988 Active as of 2010[update] , modernized to project 08773 in 2001–2003 India S60 Sindhukesari Saint Petersburg 877EKM 20 April 1988 16 August 1988 29 October 1988 Active as of 2010[update] , modernized to project 08773 in 1999–2001 Russia B-808 Yaroslavl Nizhniy Novgorod 877 29 September 1986 30 July 1988 27 December 1988 NF Decommissioned 2022[ 67] Russia B-394 Nurlat Komsomolsk-on-Amur 877 15 April 1988 3 September 1988 30 December 1988 PF Status unclear; active as of 2018; likely to decommission in mid/latter 2020s[ 68] Russia B-800 Kaluga (ex-Vologodskij komsomolets )Nizhniy Novgorod 877LPMB[citation needed ] 5 March 1987 7 May 1989 30 September 1989 NF Refitted in 2009–2012, active 2022[ 67] India S61 Sindhukirti Saint Petersburg 877EKM 5 April 1989 26 August 1989 30 October 1989 Active, modernized to project 08773 Russia B-464 Ust'-Kamchatsk Komsomolsk-on-Amur 877 26 May 1989 23 September 1989 30 January 1990 PF Status unclear; active as of 2018; likely to decommission in mid/latter 2020s[ 69] Russia B-459 Vladikavkaz Nizhniy Novgorod 877 25 February 1988 29 April 1990 30 September 1990 NF Refitted in 2011–15, active, entered Baltic Sea 3 July 2018 to take part in Main Naval Parade in St Petersburg on 29 July. India S62 Sindhuvijay Saint Petersburg 877EKM 6 April 1990 27 July 1990 27 October 1990 Active as of 2010[update] , modernized to project 08773 in 2005–2007 Russia B-871 Alrosa Nizhniy Novgorod 877 17 May 1988 September 1989 30 December 1990 BSF Refitted in 2014–2022[ 70] Russia B-471 Magnitogorsk Nizhniy Novgorod 877 26 October 1988 22 September 1990 30 December 1990 NF Status unclear as of 2025; active as of 2018 Russia B-494 Ust'-Bolsheretsk Komsomolsk-on-Amur 877 5 May 1990 4 October 1990 30 December 1990 PF Decommissioned 2023[ 71] Iran 901 Taregh Saint Petersburg 877EKM 5 April 1991 25 September 1991 25 December 1991 Active as of 2012[update] .[ 72] Upgraded in Iranian shipyard.[ 73] Russia B-187 Komsomolsk-on-Amur Komsomolsk-on-Amur 877 7 May 1991 5 October 1991 30 December 1991 PF Active 2018[ 74] Russia B-177 Lipetsk Nizhniy Novgorod 877 3 November 1989 27 July 1991 30 December 1991 NF Status unclear as of 2025; active as of 2018 Russia B-190 Krasnokamensk Komsomolsk-on-Amur 877 8 May 1992 25 September 1992 30 December 1992 PF Decommissioned 2023[ 75] Iran 902 Noah Saint Petersburg 877EKM 30 April 1992 16 October 1992 31 December 1992 Unknown (probably in modernization in Iranian shipyard) Russia B-345 Mogocha Komsomolsk-on-Amur 877 22 April 1993 6 October 1993 22 January 1994 Decommissioned 29 May 2021[ 65] People's Republic of China 364 Yuan Zheng 64 Hao Nizhniy Novgorod 877EKM ??? 1994 10 November 1994 Decommissioned 2021 People's Republic of China 365 Yuan Zheng 65 Hao Nizhniy Novgorod 877EKM ??? 1995 14 August 1995 Decommissioned 2021 Iran 903 Yunes Saint Petersburg 877EKM 5 February 1992 12 July 1994 2 September 1996 Active as 2011[ 76] (probably in modernization in Iranian shipyard) India S63 Sindhurakshak Saint Petersburg 877EKM 16 February 1995 26 June 1997 2 October 1997 A munitions accident caused an explosion and fire while at berth in 2013.[ 77] It was later scuttled. India S65 Sindhurashtra Saint Petersburg 877EKM 12 December 1998 14 October 1999 16 May 2000 Active as of 2010[update]
Italics indicate estimates.Russian designation Project 636.6 is known as the "Improved Kilo II" class in the West.
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