Moreover, the Foxtrot class was one of the last designs introduced before the adoption of the teardrop hull, which offered much better underwater performance.

This gave it an underwater endurance of 10 days, but the weight of the batteries made the Foxtrot's average speed a slow 2 knots (3.7 km/h) at its maximum submerged time capability.

The Russian Navy retired its last Foxtrots between 1995 and 2000;[2] units were scrapped and disposed of for museum purposes.

[3] During the division of the Soviet Black Sea Fleet, in 1997 one Foxtrot class submarine (later renamed as Zaporizhzhia) was passed to Ukraine as it was not operational since 1991.

Project 641s played a central role in some of the most dramatic incidents of the Cuban Missile Crisis.

[6] US Navy destroyers dropped practice depth charges near Project 641 subs near Cuba in efforts to force them to surface and be identified.