High Quality Content by WIKIPEDIA articles! Project 971, is a nuclear-powered attack submarine first deployed by the Soviet Navy in 1986. Akula is also the Soviet designation of the ballistic missile submarine class designated by NATO as the Typhoon class submarine. There are three sub-classes or flights of Shchuka, consisting of the original seven "Akula I" submarines which were built between 1982 and 1986, five "Improved Akula" submarines built between 1986 and 1991, and two "Akula II" submarines built from 1991. The distinction between the Improved Akula and the Akula II class is debated by authoritative sources. The Russians call all of the submarines Schuka-B, regardless of modifications. The Akula incorporates a double hull system composed of an inner pressure hull and an outer "light" hull. This allows more freedom in the design of the exterior hull shape, resulting in a very hydrodynamic submarine compared to western counterparts at the time. The distinctive "bulb" or "can" seen on top of the Akula's rudder houses its towed sonar array, when retracted.

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