Project 641B Tango class
The Tango class submarine was designed to engage enemy surface forces and submarines and to protect friendly convoys. The Tango has a more streamlined hull than the prior Foxtrot class, making the Tango more suitable for submerged operations. The Tango also has a greater battery storage capacity and more advanced electronic systems than the Foxtrot. The Tango's six 533 mm torpedo tubes can also be used to deploy mines. It was equipped with a new sonar system fitted with a large passive array, a storage battery of a larger capacity, powerful torpedo armament, including quick-loading gear, automatic fire control system and other improvements. But actually, it was no more than an improved version of the diesel submarine of Project 641.
Most units of this class were retired starting in 1995. As of early 2000 perhaps four units were thought to in the Northern Fleet, though largely inoperable, with another six units believed remain in reserve though unlikely to be returned to service. The status of specific units is conjectural.
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