The Foxtrot class was the NATO reporting name of a class of diesel-electric patrol submarines that were built in the Soviet Union. The Soviet designation of this class was Project 641. The Foxtrot class was designed to replace the earlier Zulu class, which suffered from structural weaknesses and harmonic vibration problems that limited its operational depth and submerged speed. The first Foxtrot keel was laid down in 1957 and commissioned in 1958 and the last was completed in 1983. A total of 58 were built for the Soviet Navy at the Sudomekh division of the Admiralty Shipyard, Saint Petersburg. Additional hulls were built for other countries.
The Scorpène-class submarines are a class of diesel-electric attack submarines jointly developed by the French Naval Group and the Spanish company Navantia. It features diesel propulsion and an additional air-independent propulsion (AIP). It is now marketed as the Scorpène 2000.
The Kalvari-class submarines, formally classified as the Project-75 submarines (P-75), is a class of diesel-electric attack submarines operated by the Indian Navy (IN). Currently being constructed by a syndicate of French and Indian shipyards, namely, Naval Group and Mazagon Dock Limited (MDL) respectively, the class is an export derivative of the French-origin Scorpène-class submarine, originally designed by Naval Group.
Vela-class submarines of the Indian Navy were variants of the later Soviet Foxtrot-class submarines. The last of the class was decommissioned from the Indian Navy in December 2010.
INS Kalvari (S23) was the lead vessel of the Kalvari class of diesel-electric submarines of the Indian Navy. It was the first ever submarine inducted into service by the Indian Navy. The submarine was laid down on 27 December 1966 as Foxtrot-class submarine B-51 of the Soviet Navy by Novo-Admiralty at Galerniy Island, Leningrad.
INS Karanj (S21) was a Kalvari-class diesel-electric submarine of the Indian Navy.
INS Vagir (S41) was a Vela-class diesel-electric submarine of the Indian Navy.
Soviet submarine B-401 may refer to one of the following submarines of the Soviet Navy:
INS Kalvari (S21) is the first of the six indigenous Scorpène-class submarines currently in service with the Indian Navy. It is a diesel-electric attack submarine which is designed by DCNS and was manufactured at Mazagon Dock Limited in Mumbai.
Kalvari-class submarines were the first submarines inducted into the Indian Navy. They were variants of the early Soviet Foxtrot-class submarines. Four of the class served in the Indian Navy. Four additional variants of the later Foxtrot class were inducted as the Vela class.
INS Khanderi (S22) is the second of the Indian Navy's six Kalvari-class submarines being built in India. It is a diesel-electric attack submarine which was designed by French naval defence and energy company DCNS and manufactured at Mazagon Dock Limited in Mumbai.
INS Karanj (S23) is the third submarine of the first batch of six Kalvari-class submarines for the Indian Navy. It is a diesel-electric attack submarine based on the Scorpène class, designed by French naval defence and energy group DCNS and manufactured by Mazagon Dock Limited, an Indian shipyard in Mumbai. The submarine was launched on 31 January 2018, delivered to Indian Navy on 15 February 2021, commissioned on 10 March 2021 in Mumbai in presence of Chief of Naval Staff Admiral Karambir Singh and Admiral (Retired) VS Shekhawat.
INS Vela (S24) is the fourth submarine of the first batch of six Kalvari-class submarines for the Indian Navy. It is a diesel-electric attack submarine based on the Scorpène class, designed by French naval defence and energy group DCNS and manufactured by Mazagon Dock Limited, an Indian shipyard in Mumbai. The first cutting of steel for the submarine began on 14 July 2009, and the ship was launched on 6 May 2019.
Kalvari-class submarine may refer to:
INS Vagir (S25) is the fifth submarine of the first batch of six Kalvari-class submarines for the Indian Navy. It is a diesel-electric attack submarine based on the Scorpène class, designed by French naval defence and energy group Naval Group and manufactured by Mazagon Dock Limited, an Indian shipyard in Mumbai, Maharashtra.
Rear Admiral Arun Auditto, AVSM, NM was a Flag Officer in the Indian Navy. He was decorated with a gallantry award during the Liberation of Goa. A pioneer submariner in the Indian Navy, he was the commissioning Commanding Officer of the Kalvari-class submarine INS Kursura (S20), which he commanded during the Indo-Pakistani War of 1971. He later commanded the submarine base INS Virbahu and the Whitby-class frigate INS Trishul (F143). After promotion to flag rank, he served as the Fortress Commander Andaman and Nicobar (FORTAN) and as the first Flag Officer Submarines, before retiring in 1988.
The Flag Officer Submarines (FOSM) is the single-point class authority of submarines in the Indian Navy. A two star Officer holding the rank of Rear Admiral, the FOSM is responsible for submarine safety, submarine training, maintenance and operating schedules and operational readiness inspections. The current FOSM is Rear Admiral K. Venkatraman who assumed office on 1 April 2023.
The Commodore Commanding Submarines (East) is an operational appointment in the Indian Navy. The COMCOS (E) is the commander of the all submarines and allied units of Eastern Naval Command. Based in Visakhapatnam, Andhra Pradesh, the COMCOS is also the Commanding Officer of the submarine base INS Virbahu. Currently, there are two COMCOS in the Indian Navy, COMCOS (East) and COMCOS (West). The COMCOS (E) is a one star officer holding the rank of Commodore. The current COMCOS (E) is Commodore K. Venkatraman, VSM who took over on 20 February 2020.
The Commodore Commanding Submarines (West) is an operational appointment in the Indian Navy. The COMCOS (W) is the commander of the all submarines and allied units of Western Naval Command. Based in Mumbai, Maharashtra, the COMCOS is also the Commanding Officer of the submarine base INS Vajrabahu. Currently, there are two COMCOS in the Indian Navy, COMCOS (East) and COMCOS (West). The COMCOS (W) is a one star officer holding the rank of Commodore. The current COMCOS (W) is Commodore Sriram Amur.
INS Vagsheer (S26) is the sixth submarine of the first batch of six Kalvari-class submarines for the Indian Navy. It is a diesel-electric attack submarine based on the Scorpène class, designed by French naval defence and energy group Naval Group and manufactured by Mazagon Dock Limited, an Indian shipyard in Mumbai, Maharashtra. The ship was launched on 20 April 2022.
India
