INS Kursura (S20) was a Kalvari-class diesel-electric submarine of the Indian Navy. She was India's fourth submarine. Kursura was commissioned on 18 December 1969 and was decommissioned on 27 February 2001 after 31 years of service. She participated in the Indo-Pakistani War of 1971, where she played a key role in patrol missions. She later participated in naval exercises with other nations and made many goodwill visits to other countries.
After decommissioning, she was preserved as a museum for public access on Ramakrishna Mission Beach in Visakhapatnam. 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. Despite being a decommissioned submarine, she still receives the navy's "Dressing Ship" honour, which is usually awarded only to active ships.
The Kursura has a length of 91.3 m (300 ft) overall, a beam of 7.5 m (25 ft) and a draught of 6 m (20 ft). She displaces 1,950 t (1,919 long tons) surfaced, 2,475 t (2,436 long tons) submerged and has a maximum diving depth of 985 ft (300 m). The complement is about 75, including 8 officers and 67 sailors.
Kursura was commissioned on 18 December 1969 at Riga, Soviet Union. She was India's fourth submarine. Kursura's first commander was Commander A Auditto. She began her maiden voyage to India on 20 February 1970. During her homecoming voyage, which lasted from February to April 1970, she visited Goteborg, La Corunna, Takoradi and Mauritius.
Kursura, along with INS Karanj, the sister boat of Kursura, were made operational under the Indian Navy's Western Naval Command, and reported to the Flag officer Commanding-in-Chief Western Naval Command (FOCINCWEST). They were ordered to patrol approaches to Pakistan's Karachi harbour and Makran Coast, for which they established waiting stations and submarine havens.
Museum ship (2002 – present)
After decommissioning, the ship was towed to Ramakrishna Mission Beach in Vishakapatnam and was established as a museum ship, which is the first Submarine Museum in South Asia. The idea of the boat's conversion to a museum is credited to Admiral V Pasricha. Towing the submarine 600 metres to its final location took 18 months and cost INR 55 million. It was inaugurated by the chief minister of Andhra Pradesh Chandrababu Naidu on 9 August 2002, and it was open to the public from 24 August 2002. Six retired naval personnel serve as guides and another one as the curator.