Description:
The Project 971-class nuclear-powered submarines, Akula NATO-codename and Schuka-B Russian designation, have been designed to engage surface ships, submarines, and ground targets using nuclear and conventional weapons. They feature a double-hull design with four 533mm and 4 650mm torpedo tubes. They can launch torpedoes, missiles, mines and rockets through the 8 torpedo tubes.
The Project 971A, Akula II NATO-codename, feature the quietest propulsion system produced for a nuclear-powered submarine in the former Soviet Union/Russia. The hull is 4 meters longer than previous Project 971 submarines. Besides improved stealth features, Akula II submarines have 6 533mm and 4 650mm torpedo tubes and automated systems requiring a lower crew.
So far, the Russian Navy has commissioned six Project 971A class submarines but the exact number of submarines to be deployed remains uncertain. India purchased an Akula II nuclear-powered attack submarine under a secret deal signed in January 2004. Apparently, the ship will be leased to India for 10 years.
Specifications Accommodation: Crew 50
Number of Weapons: 40
Dimensions: Length 114 m, Width 13.5 m
Weights: Full Displacement 12,500 t, Min Weight 8,100 t
Performance: Endurance 100 day, Max Operating Depth 500 m (1,640 ft), Top Speed 18 mps (35 kt)
India / 1 
Russia / 6 