|Displacement:||2,325 t (2,288 long tons) surfaced
3,076 t (3,027 long tons) submerged
|Length:||72.6 m (238 ft 2 in)|
|Beam:||9.9 m (32 ft 6 in)|
|Draught:||6.6 m (21 ft 8 in)|
|Propulsion:||2 × diesel-electric motors, 3,650 hp (2,722 kW) each
1 × motor, 5,900 hp (4,400 kW)
2 × auxiliary motors, 204 hp (152 kW)
1 × economic speed motor, 130 hp (97 kW)
|Speed:||10 knots (19 km/h; 12 mph) surfaced[verification needed]
17 knots (31 km/h; 20 mph) submerged[verification needed]
|Range:||6,000 mi (9,700 km) at 7 kn (13 km/h; 8.1 mph) snorkeling
400 mi (640 km) at 3 kn (5.6 km/h; 3.5 mph) submerged
|Test depth:||300 m (980 ft)|
|Complement:||53 (13 Officers)|
|Armament:||• 9M36 Strela-3 (SA-N-8) SAM launcher
• Club-S (3M-54E) ASCM (after mid-life refit)
• Type 53-65 passive wake homing torpedo
• TEST 71/76 anti-submarine, active-passive homing torpedo
• 24 × DM-1 mines in lieu of torpedoes
Sindhughosh-class submarines are Kilo-class diesel-electric submarines in active service with the Indian Navy. Their names are in Sanskrit, but in their Roman-alphabet forms sometimes a final short -a is dropped.
The submarines have a displacement of 3,000 tonnes, a maximum diving depth of 300 meters, top speed of 18 knots, and are able to operate solo for 45 days with a crew of 53. The final unit was the first to be equipped with the 3M-54 Klub (SS-N-27) antiship cruise missiles with a range of 220 km.
On 10 January 2008, the INS Sindhughosh collided with cargo ship MV Leeds Castle. The submarine is reported to have sustained superficial damage to its conning tower. As a result, the submarine was out of service for a month. The cargo ship was in restricted shallow waters.
On 26 February 2010, a fire on board INS Sindhurakshak killed one sailor and injured two others. The fire was due to a defective battery.
On 14 August 2013 an explosion, followed by a fire, was reported to have occurred on the Sindhurakshak. The Sindhurakshak sank in the dock.
On 17 January 2014, INS Sindhughosh run aground due to the low tide, while returning into Naval Dockyard, Mumbai.
On 26 February 2014, smoke was detected on board INS Sindhuratna resulting in 7 sailors being rendered unconscious and two dead. Those unconscious were airlifted to hospital 
On 29 August 2014 DAC cleared the long-awaited mid-life upgrade of the four kilo class submarines, which would be carried out in Indian shipyards and is likely to cost a Rs. 4,800 crore.
On 5 November 2014 Official sources at HSL said more than 90% of the work has been completed on the seventh submarine of the Sindhughosh-class INS Sindhukirti. She is scheduled to re-join the fleet on 31 March 2015.
Ships of the class
|Name||Pennant||Builder||Homeport||Commission Date||Status||Meaning of name|
|Mumbai||30 April 1986||Refitted to project 08773 2002-2005 at Zvezdochka shipyard||Battle-cry/rumour/report of the Sea|
|INS Sindhudhvaj||S56||Sevmash||Mumbai||12 June 1987||To be Refitted to project 08773||Flag of the Sea|
|INS Sindhuraj||S57||Sevmash||Mumbai||20 October 1987||To be Refitted to project 08773||King of the Sea|
|INS Sindhuvir||S58||Sevmash||Mumbai||26 August 1988||Refitted to project 08773 1997-1999 at Zvezdochka shipyard||Valiant of the Sea|
|INS Sindhuratna||S59||Sevmash||Mumbai||22 December 1988||Refitted to project 08773 2001-2003 at Zvezdochka shipyard||Jewel of the Sea|
|INS Sindhukesari||S60||Sevmash||Vishakhapatnam||16 February 1989||To be Refitted to project 08773||Lion of the Sea|
|INS Sindhukirti||S61||Sevmash||Vishakhapatnam||4 January 1990||Undergoing refit to project 08773 from 2007 in her home base Vishakhapatnam||Fame of the Sea|
|INS Sindhuvijay||S62||Sevmash||Vishakhapatnam||18 March 1991||Refitted to project 08773 2005-2007 at Zvezdochka shipyard||Victory of the Sea|
|INS Sindhurakshak||S63||Sevmash||Mumbai||24 December 1997||Refitted to project 08773 09.08.2010-2012 at Zvezdochka shipyard.
Exploded and sank in Mumbai 14 August 2013
|Protector of the Sea|
|INS Sindhushastra||S65||Sevmash||Vishakhapatnam||19 July 2000||To be Refitted to project 08773||Weapon of the Sea|
- News report on Submarine collision
- Fire Mishap on INS Sindhurakshak
- "Indian submarine hit by explosion at Mumbai port". BBC News. 14 August 2013. Retrieved 14 August 2013.
- "Submarine hits ground due to low tide, no casualty". 19 January 2014. Retrieved 27 February 2014.
- "Two officers died in fire on board submarine INS Sindhuratna, confirms navy". NDTV News. 27 February 2014. Retrieved 27 February 2014.
- Russian shipyard to float upgraded Indian Navy Kilo class submarine
- "Even Hudhud could not stop INS Sindhukirti refit at HSL". 5 Nov 2014.
- "Russia delayed sub refit to weaken shipyard?". Business Standard. 2 September 2014. Retrieved 8 September 2014.
- Kesari is lion in Sanskrit
- Shastra is weapon in Sanskrit
INS Sindhurakshak (S63) at Portsmouth Harbour, UK in 2013