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{{Short description|1985 Sindhughosh-class submarine}}
{{Use dmy dates|date=July 2019}}
{{Use Indian English|date=July 2019}}
{{Infobox ship
|section1={{Infobox ship/image
|image=INS Sindhughosh (S55).JPEG
|image_caption=
}}

|section2={{Infobox ship/career
|hide_header=
|country=India
|flag={{shipboxflag|India|naval}}
|name=INS ''Sindhughosh''
|namesake="Roar of the Sea"
|ordered=
|builder=
|laid_down=
|launched=29 June 1985
|acquired=
|commissioned=30 April 1986
|decommissioned=19 December 2025
|in_service=
|out_of_service=
|struck=
|reinstated=
|fate=
|status=Decommissioned
|badge = }}

|section3={{Infobox ship/characteristics
|hide_header=
|header_caption=
|class= {{sclass|Sindhughosh|submarine}}
|type=
|displacement=*2325 tons surfaced,
*3076 tons submerged
|length={{convert|72.6|m|ft|abbr=on}}
|beam={{convert|9.9|m|ft|abbr=on}}
|draught={{convert|6.6|m|ft|abbr=on}}
|draft=
|propulsion=*2 × {{convert|3650|hp|abbr=on}} diesel-electric motors
*1 × {{convert|5900|hp|abbr=on}} motor
*2 × {{convert|204|hp|abbr=on}} auxiliary motors
*1 × {{convert|130|hp|abbr=on}} economic speed motor
|speed=*Surfaced; {{convert|11|kn|km/h}}<ref>{{cite web|title=Rosoboron exports - Project 636|url=https://roe.ru/eng/catalog/naval-systems/submarines/project-636/}}</ref>
*Snorkel mode; {{convert|9|kn|km/h}}
*Submerged; {{convert|19|kn|km/h}}<ref>{{cite web|title=Rosoboron exports - Project 636|url=https://roe.ru/eng/catalog/naval-systems/submarines/project-636/}}</ref>
|range=*Snorting:{{convert|6000|mi|km|abbr=on}} at {{convert|7|kn|km/h|abbr=on}}
*Submerged:{{convert|400|mi|km}} at {{convert|3|kn|km/h}}
|endurance=Up to 45 days with a crew of 52
|test_depth=*Operational depth; {{convert|240|m|ft|abbr=on}}
*Maximum depth; {{convert|300|m|ft|abbr=on}}
|complement=52 (incl. 13 Officers)
|sensors=
|EW=
|armament=*[[Strela 3|9M36 Strela-3]] (SA-N-8) SAM launcher
*[[3M-54 Klub|Klub-S (3M-54E) ASCM]]
*[[53-65 torpedo|Type 53-65]] passive wake homing torpedo
*TEST 71/76 anti-submarine, active-passive homing torpedo
*24 DM-1 [[Naval mine|mines]] in lieu of torpedo tube
|notes=
}}
}}
'''INS ''Sindhughosh'' (S55)''' ({{Lit|Roar of the Sea}}) is the [[lead ship]] of [[Sindhughosh-class submarine|her class]] of diesel-electric [[submarine]]s of the [[Indian Navy]].<ref name=in-sg>{{cite web|url=http://indiannavy.nic.in/sub_sindhughosh.htm |title=Submarines of Indian Navy |access-date=2009-08-05 |url-status=dead |archive-url=https://web.archive.org/web/20090619071559/http://indiannavy.nic.in/sub_sindhughosh.htm |archive-date=2009-06-19 }}</ref>

The submarine was commissioned on 30 April 1986 in [[Riga]], [[Latvia]] under the command of Commander K C Varghese.<ref>{{Cite news|url=https://twitter.com/indiannavy/status/865186208145481730|title=SpokespersonNavy on Twitter|work=Twitter|access-date=2017-05-23|language=en}}</ref> The submarine is diesel-powered and has a total of six motors. INS ''Sindhughosh'' was the first submarine in Indian Navy to be equipped with the Klub ZM-54E SS-N-27 antiship cruise missiles with a range of {{convert|220|km}}. The submarine has a displacement of nearly 3,100 tons when submerged, a maximum diving depth of {{convert|300|m|ft}}, speed of up to {{convert|17|kn|km/h}}, and is able to operate solo for 45 days with a crew of 52.

==Service history==
=== Collision with a foreign vessel (2008)===
INS ''Sindhughosh'' collided with a foreign merchant vessel - MV ''Leeds Castle'' - while trying to surface in the seas north of [[Mumbai]] on 7 January 2008. The submarine was taking part in fleet level war games when the accident occurred. The boat has reportedly suffered slight damage to the conning tower area. Naval officials said the submarine was submerged and had its radars off and periscope down when it slammed into the merchant vessel off India's [[Diu Island]], {{convert|400|nmi|km}} from Mumbai. The boat was apparently maintaining total radio and radar silence to escape detection, when the accident took place. It has also been reported that the indigenously developed USHUS sonar malfunctioned and played a direct role in the accident. A Navy officer, on condition of anonymity, stated that the MV ''Leeds Castle'' was in restricted waters and in that area the ocean depth is not great and thus the reason for the mishap. Other naval officials expressed surprise that how in the high seas, the submarine was cruising at only at a depth of 10 to {{convert|20|ft|m}}. The submarine was towed to a naval dockyard at Mumbai and a [[Board of Inquiry]] was ordered to probe the mishap. The crew of INS ''Sindhughosh'' had a miraculous escape as the accident was caused at surface level. The reports of structural damage is a cause of concern. Normally the submarine has two hulls. But any damage to structure means checking the entire review of the whole structure. Even if one steel bar has a weakness, the submarine will face adverse conditions at {{convert|250|m|ft}} below sea level.

===Fire damage (2013)===
On 14 August 2013, ''Sindhughosh'' sustained minor damage in a fire which caused explosions and the sinking of {{INS|Sindhurakshak|S63|6}}, while at dock in Mumbai. The navy did not release any details of the extent of damage on ''Sindhughosh''.<ref name=bs0991>{{cite news|title=International help to salvage sunken submarine|url=http://www.business-standard.com/article/current-affairs/international-help-to-salvage-sunken-submarine-113081900991_1.html|access-date=20 August 2013|newspaper=Business Standard|date=20 August 2013}}</ref>

===Runs aground (2014)===
On 17 January 2014, INS ''Sindhughosh'' ran aground due to the low tide, while returning to [[Naval Dockyard (Mumbai)|Naval Dockyard, Mumbai]].<ref>{{cite news | title=Submarine hits ground due to low tide, no casualty | url=https://mumbaimirror.indiatimes.com/mumbai/others/Submarine-hits-ground-due-to-low-tide-no-casualty/articleshow/29021702.cms | newspaper=Mumbai Mirror | date=19 January 2014 | access-date=6 July 2019}}</ref>

=== Decommissioning ===
''Sindhughosh'' was decommissioned after 40 years of service in Mumbai in the presence of the [[Flag Officer Commanding-in-Chief Western Naval Command|Western Naval Command chief]], [[Vice admiral (India)|Vice Admiral]] [[Krishna Swaminathan]]. The submarine was paid off under the command of [[Lieutenant commander|Lieutenant Commander]] Rajat Sharma.<ref name="X-1912252">{{cite tweet |number=2002227582222414199 |user=IN_WNC |title=INS Sindhughosh, the lead submarine of her class in service with the #IndianNavy, was decommissioned at sunset on 19 Dec 25... |date=19 December 2025 |access-date=20 December 2025}}</ref>

==References==
{{reflist}}

== External links ==
*[https://web.archive.org/web/20080212072136/http://www.bharat-rakshak.com/NAVY/Sindhugosh.html INS Sindhughosh and her collision at Bharat-Rakshak]

{{Kilo class submarine}}
{{Submarines of the Indian Navy}}

{{DEFAULTSORT:Sindhughosh (S55)}}
[[Category:Sindhughosh-class submarines]]
[[Category:Attack submarines]]
[[Category:Ships built by Sevmash]]
[[Category:1985 ships]]
[[Category:Submarines of India]]
[[Category:Indian submarine accidents]]

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{{India-mil-stub}}

INS Sindhughosh - Revision history

Flash255 at 13:20, 20 December 2025