INS Kursura (S20) was a Kalvari-class (variant of the Foxtrot-class) diesel-electric submarine of the Indian Navy.

It later participated in naval exercises with other nations and made many goodwill visits to other countries.

Kursura has the distinction of being one of the very few submarine museums to retain originality and has been called a "must-visit destination" of Visakhapatnam.

[5] During her homecoming voyage, which lasted from February to April 1970, she visited Göteborg, La Coruña, Takoradi and Mauritius.

They were ordered to patrol approaches to Pakistan's Karachi harbour and Makran Coast, for which they established waiting stations and submarine havens.

[7] In 1970, Karanj was badly damaged after a collision with the destroyer Ranjit when she surfaced directly below the ship.

As no drawings of the damaged portions of the boat were available with the Bombay Dockyard or the Indian Navy, it was decided to use Kursura, which was already docked at Bombay, as the design template for the metal work, and Karanj was repaired within months, in time to join the Indo-Pakistani War of 1971.

She was given the patrol duties at two designated areas before the war started, but was ordered to operate under two restrictions: she was not to cross demarcated shipping corridors and she could attack a target only after positive identification.

On 30 November, she rendezvoused with Karanj at sea to transfer instructions and subsequently then left for Bombay and reached there by 4 December 1971.

During her patrols, she encountered fair weather and monitored a number of tankers and commercial aircraft flying on international routes.

[13] After a service of 31 years and traversing 73,500 nautical miles (136,100 km; 84,600 mi), she was decommissioned on 27 February 2001.

[14] She has become a famous tourist attraction of the city and has been called a "must-visit destination" of Visakhapatnam by The Hindu.