RPK-2 Vyuga

The RPK-2 Vyuga (РПК-2 Вьюга, blizzard; NATO reporting name: SS-N-15 Starfish), also designated as 81R, is a Soviet submarine-launched, nuclear-armed anti-submarine missile system, launched exclusively through 533 mm torpedo tubes. The system was designed in Sverdlovsk, Russian SFSR in the 1960s.

Analogous to the SUBROC missile previously used by the US Navy, it is designed to be fired from a 533 mm torpedo tube. It is boosted by a choice of mechanisms depending on model before clearing the water, firing a solid fuel rocket and delivering its payload up to 45 km away. The payload ranges from a simple depth charge to a 200 kt nuclear depth bomb.

Design
The RPK-2 uses a 82R torpedo or 90R nuclear depth charge in the 533 mm version, and a 83R torpedo carrying or 86R nuclear depth charge in 650 mm version.

Both submarine- and surface-launched versions exist. The surface-launched versions are used by the Slava-class cruiser, Kirov-class battlecruiser, Neustrashimy-class frigate and Udaloy-class destroyer classes. The submarine-launched versions are used by the Akula-class submarine, Oscar-class submarine, Typhoon-class submarine, Delta-class submarine, Kilo-class submarine, and Borei-class submarine classes. However, the munition package used in either is identical and hence the ship-launched version is launched into the water and submerges before firing its engines.