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.^{[citation needed]}

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

Equivalent submarines of the same era