page_title: Foxtrot-class submarine
section_title: Operators
hierarchical_section_title: Foxtrot-class submarine / Operators
caption_attribution_description: Deutsch: Ein libysches U-Boot der Foxtrot-Klasse. English: A view of a Libyan Foxtrot Class attack submarine.
context_page_description: 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 Foxtrot class was comparable in performance and armament to most contemporary designs. However, its three screws made it noisier than most Western designs. Moreover, the Foxtrot class was one of the last designs introduced before the adoption of the teardrop hull, which offered much better underwater performance. Also, although the Foxtrot was larger than a Zulu class submarine, the Foxtrot class had 2 of its 3 decks dedicated to batteries.
context_section_description: Most saw service in the Soviet Navy. Foxtrots were also built for the Indian Navy (eight units, from 1967 to 1974), Libyan (six units, from 1978 to 1980), and Cuban (six units, from 1978 to 1983) navies. Some Soviet Foxtrots later saw service in the Polish and Ukrainian navies.
  Soviet Navy (passed on to successor states)
  Russian navy (ex–Soviet Navy)
  Indian Navy Variants known as the Kalvari class, now decommissioned (INS Kursura converted into a museum)
  Libyan Navy 6 units (2 left but probably abandoned)
  Cuban Navy 6 units
  Polish Navy 2 units (ex–Soviet Navy)
  ORP Wilk (1987–2003)
  ORP Dzik (1988–2003)
  Ukrainian Navy 1 unit (Zaporizhzhia), has been taken over by Russian forces during the 2014 Crimean crisis.
caption: A Libyan foxtrot
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