They were variants of the early Soviet Foxtrot-class submarines.

Four of the class served in the Indian Navy.

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.

This military article about the Indian Armed Forces is a stub.