The Typhoon ( the Russian name for the class is "Akula")

The Typhoon was the world's largest submarine and was one of the most feared weapons of the Cold War. Each submarine is capable of carrying twenty long-range ballistic missiles with up to 200 nuclear warheads that were once aimed at the United States.
NATO apparently derived the name 'Typhoon' from a 1974 speech by Leonid Brezhnev which mentioned a new SSBN called the "Tayfun". In fact, the Russian name for the class is "Akula" -- "Shark" -- which should not be confused with NATO's "Akula" SSN (which the Russians designate as "Bars").
The development of the 941 heavy strategic submarine was authorized in December 1972, and on 19 December 1973 the governmental officially issued the order to design and build the 941 ballistic missile submarine. The developer was the Leningrad design bureau which is now the Central Design Bureau for Marine Engineering "Rubin". After intensive testing the heavy ballistic missile submarine 941-"TK-208" was commissioned in September 1980 and introduced into the Northern fleet on 12 December 1981. Between 1981 and 1989 six Typhoon submarines entered service. They formed part of the 1st flotilla of atomic submarines based in the Western Theater of the Northern fleet based at Nyerpichya. A seventh vessel was begun but never finished.
The project was developed with the objective to match the SLBM armament of Ohio-class submarines, capable of carrying 192 nuclear warheads, 100 kt each. However, at the time, state-of-the-art Soviet SLBMs were substantially larger and heavier than their American counterparts (the R-39 is more than two times heavier than the Trident I; it remains the heaviest SLBM in service worldwide). The submarine had to be scaled accordingly.
The Typhoon Class submarine is of multi-hulled design – five inner hulls are situated inside a superstructure of the two parallel main hulls. The superstructure is coated with sound-absorbent tiles. There are 19 compartments including a strengthened module which houses the main control room and electronic equipment compartment which is above the main hulls behind the missile launch tubes.
The submarine's design includes features for travelling under ice and ice-breaking. It has an advanced stern fin with horizontal hydroplane fitted after the screws. The nose horizontal hydroplanes are in the bow section and are retractable into the hull.
The retractable systems include two periscopes (one for the commander and one for general use), radio sextant, radar, radio communications, navigation and direction-finder masts.
They are housed within the sail guard. The sail and sail guard have a reinforced rounded cover for ice-breaking.
Maximum diving depth is 400m. Speed is 12kt when surfaced and 25kt when submerged. Typhoon is capable of spending 120 days at sea.

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