![]() Modernization cost was estimated at RUB12 billion (US$182 million) per submarine. The upgraded submarines will be known as "Project 949AM", according to the Russian officials. In September 2015, Russian Defence Minister Sergey Shoygu announced during his visit to Zvezda shipyard, that at least three Oscar-class submarines will undergo repair and modernization to extend their service life by 20 years. The Rubin Design Bureau started working on Project 949A modernization in 2011, with Zvezdochka and Zvezda shipyards to carry out modernization of the vessels. In the financial problems that followed the fall of the Soviet Union the Oscar class was prioritized by the Russian Navy, and when many older submarine classes were retired the Oscar class remained active in both the Northern and Pacific Fleets. The Oscar class was designed to attack NATO carrier battle groups using long-range P-700 Granit (SS-N-19 "Shipwreck") anti-ship missiles and targeting data provided by the EORSAT satellite system (via the submarine's "Punch Bowl" antenna). In total fourteen submarines were constructed. In 1982 an updated and larger version (Project 949A) replaced the earlier version. The first submarine of Project 949 was laid down in the mid-1970s and was commissioned in 1980. Only the Soviet Typhoon-class, Russian Borei-class and American Ohio-class ballistic missile submarines are larger. ![]() They are the fourth largest class of submarines in displacement and length. The Project 949 submarines were the largest cruise missile submarines in service until some Ohio-class ballistic missile submarines were converted to carry cruise missiles in 2007. Two other vessels were slated to be modernized since at least 2017 as Project 949AM, to extend their service life and increase combat capabilities but it is unclear whether work continues as of 2023. First built in the 1970s, six remain in service with the Russian Navy. The Oscar class, Soviet designations Project 949 Granit and Project 949A Antey ( NATO reporting names Oscar I and Oscar II respectively), are a series of nuclear-powered cruise missile submarines designed in the Soviet Union for the Soviet Navy. 24 × P-700 Granit (SS-N-19 Shipwreck) cruise missiles with 750 kilograms (1,650 lb) HE or 4 × 100 Mt Poseidon drones.28 × 533 mm and 650 mm weapons, including RPK-2 Vyuga (SS-N-15 Starfish) anti-submarine missiles with 15 kt nuclear warheads and RPK-6 Vodopad/RPK-7 Veter (SS-N-16) anti-submarine missiles with 200 kt nuclear warhead or Type 40 anti-submarine torpedo or 32 ground mines. ![]() 2 × pressurized water cooled reactors, HEU ≤ 45% Ģ × steam turbines delivering 73,070 kW (97,990 shp) to two shafts
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