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History
Name	INS Sindhudhvaj
Commissioned	12 June 1987
Decommissioned	16 July 2022
Fate	Scrapped
General characteristics
Class and type	Sindhughosh-class submarine
Displacement	2325 tons surfaced 3076 tons submerged
Length	72.6 m (238 ft)
Beam	9.9 m (32 ft)
Draught	6.6 m (22 ft)
Propulsion	2 × 3,650 hp (2,720 kW) diesel-electric motors 1 × 5,900 hp (4,400 kW) motor 2 × 204 hp (152 kW) auxiliary motors 1 × 130 hp (97 kW) economic speed motor
Speed	Surfaced;11 knots (20 km/h) Snorkel Mode; 9 knots (17 km/h) Submerged;19 knots (35 km/h)
Range	Snorting: 6,000 mi (9,700 km) at 7 kn (13 km/h) Submerged: 400 miles (640 km) at 3 knots (5.6 km/h)
Endurance	Up to 45 days with a crew of 52
Test depth	Operational depth; 240 m (790 ft) Maximum depth; 300 m (980 ft)
Complement	52 (incl. 13 Officers)
Sensors and processing systems	USHUS sonar
Armament	9M36 Strela-3 (SA-N-8) SAM launcher Klub-S (3M-54E) ASCM Type 53-65 passive wake homing torpedo TEST 71/76 anti-submarine, active-passive homing torpedo 24 DM-1 mines in lieu of torpedo tube

INS Sindhudhvaj (S56) was a Sindhughosh-class submarine of the Indian Navy in service from 1987 until 16 July 2022, when she was decommissioned.

The name Sindhudhvaj means "flag bearer at sea". The submarine's crest depicts a grey nurse shark. Sindhudhvaj was the submarine to operationalise several indigenously built systems including the USHUS sonar, the Rukmani and MSS satellite communication systems, the inertial navigation system and the torpedo fire control system.

The submarine also completed a successful mating and personnel transfer with a deep-submergence rescue vehicle. It was the only submarine to be awarded the Chief of the Naval Staff's Rolling Trophy for Innovation by Prime Minister Narendra Modi.

As of July 2024, the submarine, weighing 2000 tonnes, is under the process of being dismantled at Steel Industrials Kerala Limited (SILK) at Azhikkal in Kannur by 40 workers. The process will take 6 months to complete.

References

1. ^ "Rosoboron exports - Project 636".
2. "Submarines of Indian Navy". Archived from the original on 19 June 2009. Retrieved 5 August 2009.
3. "INS Sindhudhvaj Decommissioned After 35 Years of Glorious Service to the Nation". Press Information Bureau of India. 17 July 2022. Retrieved 17 July 2022.
4. ^ "INS Sindhudhvaj Decommissioned after 35 Years of Glorious Service to The Nation". Indian Navy. 17 July 2022. Retrieved 19 December 2022.
5. Service, Express News (7 July 2024). "Kerala: Dismantling of INS Sindhudhvaj begins at SILK's Azhikkal facility". The New Indian Express. Retrieved 18 July 2024.
6. "40 labourers to dismantle INS Sindhudhvaj weighing 2,000 tons in 6 months in Kannur". www.onmanorama.com. Retrieved 18 July 2024.

v t e Kilo-class submarines
Soviet and  Russian Navies	Project 877 B-171 B-177 B-187 B-190 B-219 B-224 B-227 B-229 B-248 B-260 Chita B-345 B-354 B-394 Komsomolets Tadjkistana B-401 B-402 B-404 Tyumensky Komsomolets B-405 B-425 B-437 Magnitogorsky Komsomolets B-439 B-445 B-459 B-464 B-468 B-470 B-471 B-494 B-800 B-801 B-806 B-871 B-880 Delfin Project 636.3 B-237 B-261 Novorossiysk B-262 Stary Oskol B-265 Krasnodar B-268 Veliky Novgorod B-274 Petropavlovsk-Kamchatsky B-603 Volkhov B-602 Magadan B-588 Ufa Mozhaysk Yakutsk
Algerian National Navy	Project 877EKM Rajs Hadj Mubarek class Rais Hadj Mubarek El Hadj Slimane Project 636M Messali el Hadj Akram Pacha
People's Liberation Army Navy	Project 877EKM 364 365 Project 636 366 367 Project 636M 368 369 370 371 372 373 374 375
Indian Navy	Project 877EKM Sindhughosh class Sindhughosh Sindhudhvaj Sindhuraj Sindhuratna Sindhukesari Sindhukirti Sindhuvijay Sindhurakshak Sindhurashtra
Islamic Republic of Iran Navy	Project 877EKM Taregh Nooh Yunes
Polish Navy	Project 877E Orzeł
Romanian Naval Forces	Project 877E Delfinul
Vietnam People's Navy	Project 636.1 Hà Nội Hồ Chí Minh City Hải Phòng Khánh Hoà Đà Nẵng Bà Rịa-Vũng Tàu
Myanmar Navy	Project 877EKM Minye Theinkhathu
List of Soviet and Russian submarines List of Soviet and Russian submarine classes

v t e Submarines of the Indian Navy
Commissioned	Nuclear-powered Arihant class Arihant Arighaat Conventionally-powered (diesel-electric) Shishumar class Shishumar (S44) Shankush (S45) Shalki (S46) Shankul (S47) Sindhughosh class Sindhughosh (S55) Sindhuraj (S57) Sindhuratna (S59) Sindhukesari (S60) Sindhukirti (S61) Sindhuvijay (S62) Sindhurashtra (S65) Kalvari class (2015) Kalvari (S21) Khanderi (2017) Karanj (S23) Vela (S24) Vagir (S25) Vagsheer (S26)
Future submarines	Nuclear-powered Arihant class Aridhaman S4* Conventionally-powered (diesel-electric) Kalvari class (2015) Vagir (S25) Vagsheer (S26)
Decommissioned	Nuclear-powered Charlie class Chakra (K43) Improved Akula I class Chakra (S71) Conventionally-powered (diesel-electric) Kalvari class (1967) Kursura (S20) Karanj (S21) Khanderi (1968) Kalvari (S23) Vela class Vela (S40) Vagir (S41) Vagli (S42) Vagsheer (S43) Sindhughosh class Sindhurakshak (S63) Sindhuvir (S58) Sindhudhvaj (S56)

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