Svetloxf at 21:51, 25 April 2026

2026-04-25T21:51:59Z

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{{Short description|Arihant-class nuclear submarine}}
{{use Indian English|date=July 2013}}
{{Use dmy dates|date=November 2024}}

{{Infobox ship
|section1={{Infobox ship/image
| image = Arihant follow on class submarine.jpg
| image_caption = A conceptual drawing representing the ''Arihant'' Stretch design
}}

|section2={{Infobox ship/career
| hide_header =
| country = [[India]]
| flag = {{shipboxflag|India|naval}}
| name = INS ''Arisudan''
| ordered =
| awarded =
| builder = Shipbuilding Centre (SBC), [[Visakhapatnam]], [[India]]<ref name="thehindu1">{{cite web|author=S. Anandan|url=http://www.thehindu.com/news/national/second-nuclear-submarine-headed-for-yearend-launch/article2798864.ece|title=Second nuclear submarine headed for year-end launch|work=The Hindu|date=14 January 2012|access-date=2 June 2013}}</ref>
| laid_down = 2018<ref name = "hindu1">{{cite news |title=A bigger nuclear submarine is coming |url= https://www.thehindu.com/news/national/a-bigger-nuclear-submarine-is-coming/article19862549.ece |date=2017|website=www.thehindu.com |publisher=[[The Hindu]] |access-date=25 June 2025}}</ref>
| launched = 16 October 2024 <ref> https://www.thehindu.com/news/national/indias-fourth-nuclear-submarine-launched-into-water/article68783731.ece</ref>
| christened =
| acquired =
| commissioned =
| recommissioned =
| decommissioned =
| in_service =
| out_of_service =
| renamed =
| reclassified =
| refit =
| struck =
| reinstated =
| homeport =
| captured =
| fate =
| status = [[Sea trials]] underway
}}

|section3={{Infobox ship/characteristics
| hide_header =
| header_caption =
| class = {{sclass|Arihant|submarine|1}}
| type = [[Nuclear submarine|Nuclear]] [[ballistic missile submarine]]
| displacement = 7,000 tonnes
| length = 130 m
| beam = 11 m
| height =
| draft = 9.5 m
| depth =
| decks =
| deck_clearance =
| power = *1 x CLWR-B1 Compact [[Light-water reactor]],<ref name="CLWR-B1">{{cite news|title=Founder's Day Speech, Director, BARC|url=http://www.barc.gov.in/presentations/fddir18.pdf|access-date=21 March 2021|publisher=Bhabha Atomic Research Centre|date=30 October 2018}}</ref><ref name="clwr_barc">{{cite journal|title=DAE Excellence in Science, Engineering & Technology Awards 2010|journal=BARC Newsletter|date=September–October 2011|issue=322|page=33|url=http://www.barc.gov.in/publications/nl/2011/2011091009.pdf|access-date=21 March 2021|archive-date=15 May 2013|archive-url=https://web.archive.org/web/20130515202113/http://barc.gov.in/publications/nl/2011/2011091009.pdf|url-status=dead}}</ref> 83 MW<ref name="IndiaToday" />
| propulsion = *1 × [[propeller shaft]], [[Nuclear marine propulsion|nuclear propulsion]]
| speed = '''Surfaced:''' {{convert|12|-|15|kn|km/h}}
'''Submerged:''' {{convert|24|kn|km/h}}
| range = Unlimited except by food supplies
| endurance = Unlimited except by food supply and maintenance
| test_depth = Between {{convert|300|m|abbr=on}} to {{convert|400|m|abbr=on}}
| complement =
| time_to_activate =
| sensors = *[[USHUS (sonar)|USHUS]] sonar
*[[Panchendriya (sonar)|Panchendriya]] unified submarine sonar, control system and underwater communication system <ref name="naval-technology.com">{{Cite web |url=http://www.naval-technology.com/projects/arihant-class/|title=Retrieved on 2016-10-21.|access-date=29 December 2012|archive-url=https://web.archive.org/web/20130502115614/http://www.naval-technology.com/projects/arihant-class|archive-date=2 May 2013|url-status=live }}</ref>
| EW =
| armament = * 6 × 21" (533 mm) torpedo tubes – est 30 charges (torpedoes, cruise missiles or mines)<ref name="globalsecurity">{{cite web|first=John|last=Pike|url=http://www.globalsecurity.org/military/world/india/atv-specs.htm|title=Advanced Technology Vessel (ATV)|publisher=globalsecurity.org|date=27 July 2009|access-date=24 January 2011|url-status=live|archive-url=https://web.archive.org/web/20110829062226/http://www.globalsecurity.org/military/world/india/atv-specs.htm|archive-date=29 August 2011}}</ref>
*8 VLS cells for either
**24 [[Sagarika (missile)|K-15 Sagarika]] [[SLBM]]
**8 [[K-4 (SLBM)|K-4]] [[SLBM]]
| notes =
}}
}}'''INS ''Arisudan''''' ('''SSBN 83''') ({{Lit|Slayer of foes}}) is a [[Nuclear submarine|nuclear-powered]] [[ballistic missile submarine]], and the fourth and final {{sclass|Arihant|submarine|1}} of the [[Indian Navy]]. It is designated '''S4*''' Strategic Strike Nuclear Submarine. The 7,000-tonne vessel was built under the Advanced Technology Vessel (ATV) project at the Ship Building Centre in the port city of [[Visakhapatnam]]. It is an upgraded variant of the ''Arihant''-class submarine.<ref>{{cite web|url=http://www.sunday-guardian.com/analysis/needed-a-nuclear-triad|title=Needed, a nuclear triad|publisher=Sunday-guardian.com|access-date=2 June 2013|archive-date=3 May 2014|archive-url=https://web.archive.org/web/20140503233228/http://www.sunday-guardian.com/analysis/needed-a-nuclear-triad|url-status=dead}}</ref><ref>{{cite web|url=http://www.defencenow.com/news/551/india-to-construct-two-more-arihant-nuclear-submarines-for-navy.html|title=India To Construct Two More Arihant Nuclear Submarines For Navy|publisher=Defence Now|date=28 February 2012|access-date=2 June 2013|archive-url=https://web.archive.org/web/20150712032120/http://www.defencenow.com/news/551/india-to-construct-two-more-arihant-nuclear-submarines-for-navy.html|archive-date=12 July 2015|url-status=dead}}</ref>
== Description ==
The boat will have one seven-blade propeller powered by a [[Pressurized water reactor|Compact Light Water Reactor]] (CLWR). It can achieve a maximum speed of {{convert|12|-|15|kn|km/h}} when on surface and {{convert|24|kn|km/h}} when submerged.<ref name="navaltech">{{cite web |url= http://www.naval-technology.com/projects/arihant-class/ |title=SSBN Arihant Class Submarine, India |publisher=naval-technology.com |access-date=2 June 2013}}</ref><ref>{{Cite web |date=31 August 2024 |title=INS Arighaat: How a second nuclear submarine boosts India’s strategic reach |url=https://www.indiatoday.in/india/story/ins-arighaat-how-a-second-nuclear-submarine-boosts-indias-strategic-reach-2591300-2024-08-31 |access-date=10 September 2024 |website=India Today |language=en}}</ref><ref>{{Cite web |date=22 December 2020 |title=India to commission second Arihant-class submarine in 2021 |url=https://www.janes.com/osint-insights/defence-news/india-to-commission-second-arihant-class-submarine-in-2021 |access-date=10 September 2024 |website=Default |language=en}}</ref> The CLWR is an upgraded form of the one that powers [[INS Arihant]]. The CLWR has exceptionally lower [[acoustic signature]] than the previous generation making it harder to detect by enemy vessels along with longer endurance.<ref>{{Cite web |date=8 September 2024 |title=How Refined 83 MW PWR on INS Arighat Boosts its Stealth and Endurance Compared to INS Arihant |url=https://defence.in/threads/how-refined-83-mw-pwr-on-ins-arighat-boosts-its-stealth-and-endurance-compared-to-ins-arihant.9797/ |access-date=10 September 2024 |website=Defence.in |language=en-US}}</ref>

The submarine has eight [[Vertical launching system|VLS]] tubes in its hump, as compared to four on her predecessors— She can carry up to 24 [[Sagarika (missile)|K-15 Sagarika]] missiles (each with a range of {{convert|750|km|abbr=on|disp=or}}), eight [[K-4 (missile)|K-4 missiles]] (with a range of {{convert|3500|km|abbr=on|disp=or}}) or [[K-5 (ballistic missile)|K-5 missiles]] (with range of 6,000 km or 3,700 mi).<ref name="IndiaToday">{{cite news|url=https://www.indiatoday.in/magazine/the-big-story/story/20171218-india-ballistic-missile-submarine-k-6-submarine-launched-drdo-1102085-2017-12-10|title=A peek into India's top secret and costliest defence project, nuclear submarines|date=7 December 2017|work=[[India Today]]|access-date=11 December 2017|url-status=live|archive-url=https://web.archive.org/web/20190420153439/https://www.indiatoday.in/magazine/the-big-story/story/20171218-india-ballistic-missile-submarine-k-6-submarine-launched-drdo-1102085-2017-12-10|archive-date=20 April 2019}}</ref><ref>{{Cite web|url=https://www.indiatoday.in/india/story/ins-arihant-returned-yesterday-from-20-day-deterrent-patrol-1383188-2018-11-05|title=INS Arihant returned yesterday from 20-day deterrent patrol|date=5 November 2018|website=India Today|language=en|access-date=13 October 2019}}</ref><ref>{{Cite news |date=2024-11-28 |title='Nuclear-capable ballistic missile tested from INS Arighaat' |url=https://timesofindia.indiatimes.com/india/nuclear-capable-ballistic-missile-tested-from-ins-arighaat/articleshow/115747030.cms |access-date=2024-11-30 |work=The Times of India |issn=0971-8257}}</ref>

== Construction ==
Around 2012, the [[S5-class submarine|S5 submarine project]] to succeed and supplement the first three ''Arihant'' class submarines remained in the developmental stage. Hence, another ''Arihant''-class submarine was cleared for production as a [[Stopgap|stopgap measure]]<ref name=":18">{{Cite web |date=2025-12-29 |title=CHAKRA EXCLUSIVE: India's fourth SSBN sails out for sea trials |url=https://chakranewz.com/critical-technologies/trending/chakra-exclusive-india-rsquo-s-fourth-ssbn-sails-out-for-sea-trials |access-date=2025-12-30 |website=chakranewz |language=en}}</ref> to avoid idling of the [[production line]]. The new unit was designated as S4* (between S4 and S5). The boat would also feature the stretched configuration of the third submarine of the class, {{INS|Aridhaman}}.<ref name="India Today3">{{cite news |last=Unnithan |first=Sandeep |date=7 December 2017 |title=A peek into India's top secret and costliest defence project, nuclear submarines |url=https://www.indiatoday.in/magazine/the-big-story/story/20171218-india-ballistic-missile-submarine-k-6-submarine-launched-drdo-1102085-2017-12-10 |url-status=live |archive-url=https://web.archive.org/web/20171211024434/http://indiatoday.intoday.in/story/india-ballistic-missile-submarine-k-6-submarine-launched-drdo/1/1104982.html |archive-date=11 December 2017 |access-date=11 December 2017 |work=[[India Today]]}}</ref>

The newly designated S4* submarine will be fourth and final submarine of the class, with an indigenous content of over 80%<ref name=":18" /> and equipped with K4 missiles, was thereafter launched on 16 October 2024.<ref name=":8">{{Cite news |last=Gupta |first=Shishir |date=22 October 2024 |title=India Launches 4th nuclear-missile submarine |url=https://www.hindustantimes.com/india-news/india-launches-4th-nuclear-missile-submarine-101729560730642.html |access-date=22 October 2024 |work=[[Hindustan Times]]}}</ref> By December 2025, the submarine entered [[sea trials]]. During the fourth week of the month, the vessel sailed out from her berth at the Shipbuilding Centre.<ref name=":18" /><ref name=":19">{{Cite web |last=Militar |first=Redaccion Zona |date=2025-12-30 |title=India is reported to have begun sea trials of the fourth of its new Arihant-class nuclear-powered ballistic missile submarines |url=https://www.zona-militar.com/en/2025/12/30/india-is-reported-to-have-begun-sea-trials-of-the-fourth-of-its-new-arihant-class-nuclear-powered-ballistic-missile-submarines/ |access-date=2025-12-31 |website=Zona Militar |language=en-US}}</ref>

It was also reported in January 2026, that the final submarine, so far referred to as S4*, will be named INS ''Arisudan'' upon entry into service. The name has been proposed by the ship-naming committee of the Indian Navy and is yet to be receive clearance by the defence ministry and eventually, the [[President of India]], who is also the Supreme Commander of the Armed Forces.<ref name=":20">{{Cite web |date=2026-01-05 |title=Arihant class nuclear-powered submarine S4* likely to be named INS Arisudan |url=https://www.hindustantimes.com/india-news/arihant-class-nuclear-powered-submarine-s4-likely-to-be-named-ins-arisudan-101767555406284.html |access-date=2026-01-05 |website=Hindustan Times |language=en}}</ref>

== See also ==
* [[Future of the Indian Navy]]
* [[K Missile family]]

==References==
{{reflist|colwidth=30em}}

{{Submarines of the Indian Navy}}

{{DEFAULTSORT:Arisudan}}
[[Category:Arihant-class submarines]]
[[Category:Nuclear-powered submarines]]
[[Category:Ships built in India]]
[[Category:Submarines of India]]
[[Category:2021 ships]]
[[Category:Submarine classes]]

INS Arisudan - Revision history

Svetloxf at 21:51, 25 April 2026