Kalvari-class submarines were the first submarines inducted into the Indian Navy. They were variants of the early Soviet Foxtrot-class submarines. Four of the class served in the Indian Navy. Four additional variants of the later Foxtrot class were inducted as the Vela class.

Kalvari-class (Foxtrot-class) submarine of the Indian Navy
Class overview
Name	Kalvari class
Builders	Sudomekh, Admiralty Shipyard
Operators	Indian Navy
Succeeded by	Vela class
In commission	1967–2003[1]
Completed	4
Retired	4
Preserved	1
General characteristics
Type	Submarine
Displacement	1,950 t (1,919 long tons) surfaced 2,475 t (2,436 long tons) submerged
Length	91.3 m (299 ft 6 in)
Beam	7.5 m (24 ft 7 in)
Draught	6 m (19 ft 8 in)
Speed	16 knots (30 km/h; 18 mph) surfaced 15 knots (28 km/h; 17 mph) submerged
Range	20,000 mi (32,000 km) at 8 knots (15 km/h; 9.2 mph) surfaced 380 mi (610 km) at 10 knots (19 km/h; 12 mph) submerged
Test depth	250 m (820 ft)
Complement	75 (incl 8 officers)
Armament	10 533mm torpedo tubes with 22 SET-65E/SAET-60 torpedoes 44 mines in lieu of torpedoes

INS Kursura has been preserved as a museum on Ramakrishna Mission Beach in Visakhapatnam.^[2] The sail of the lead vessel, INS Kalvari is also on display at the Visakhapatnam city museum.