INS Arisudan

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Template:Infobox shipINS Arisudan (SSBN 83) (lit. 'Slayer of foes') is a nuclear-powered ballistic missile submarine, and the fourth and final -class submarine 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.[1][2]

Description[edit | edit source]

The boat will have one seven-blade propeller powered by a Compact Light Water Reactor (CLWR). It can achieve a maximum speed of 12–15 knots (22–28 km/h) when on surface and 24 knots (44 km/h) when submerged.[3][4][5] 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.[6]

The submarine has eight VLS tubes in its hump, as compared to four on her predecessors— She can carry up to 24 K-15 Sagarika missiles (each with a range of 750 km or 470 mi), eight K-4 missiles (with a range of 3,500 km or 2,200 mi) or K-5 missiles (with range of 6,000 km or 3,700 mi).[7][8][9]

Construction[edit | edit source]

Around 2012, the 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 measure[10] 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.[11]

The newly designated S4* submarine will be fourth and final submarine of the class, with an indigenous content of over 80%[10] and equipped with K4 missiles, was thereafter launched on 16 October 2024.[12] 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.[10][13]

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.[14]

See also[edit | edit source]

References[edit | edit source]

  1. ↑ "Needed, a nuclear triad". Sunday-guardian.com. Archived from the original on 3 May 2014. Retrieved 2 June 2013.
  2. ↑ "India To Construct Two More Arihant Nuclear Submarines For Navy". Defence Now. 28 February 2012. Archived from the original on 12 July 2015. Retrieved 2 June 2013.
  3. ↑ "SSBN Arihant Class Submarine, India". naval-technology.com. Retrieved 2 June 2013.
  4. ↑ "INS Arighaat: How a second nuclear submarine boosts India's strategic reach". India Today. 31 August 2024. Retrieved 10 September 2024.
  5. ↑ "India to commission second Arihant-class submarine in 2021". Default. 22 December 2020. Retrieved 10 September 2024.
  6. ↑ "How Refined 83 MW PWR on INS Arighat Boosts its Stealth and Endurance Compared to INS Arihant". Defence.in. 8 September 2024. Retrieved 10 September 2024.
  7. ↑ "A peek into India's top secret and costliest defence project, nuclear submarines". India Today. 7 December 2017. Archived from the original on 20 April 2019. Retrieved 11 December 2017.
  8. ↑ "INS Arihant returned yesterday from 20-day deterrent patrol". India Today. 5 November 2018. Retrieved 13 October 2019.
  9. ↑ "'Nuclear-capable ballistic missile tested from INS Arighaat'". The Times of India. 28 November 2024. ISSN 0971-8257. Retrieved 30 November 2024.
  10. ↑ 10.0 10.1 10.2 "CHAKRA EXCLUSIVE: India's fourth SSBN sails out for sea trials". chakranewz. 29 December 2025. Retrieved 30 December 2025.
  11. ↑ Unnithan, Sandeep (7 December 2017). "A peek into India's top secret and costliest defence project, nuclear submarines". India Today. Archived from the original on 11 December 2017. Retrieved 11 December 2017.
  12. ↑ Gupta, Shishir (22 October 2024). "India Launches 4th nuclear-missile submarine". Hindustan Times. Retrieved 22 October 2024.
  13. ↑ Militar, Redaccion Zona (30 December 2025). "India is reported to have begun sea trials of the fourth of its new Arihant-class nuclear-powered ballistic missile submarines". Zona Militar. Retrieved 31 December 2025.
  14. ↑ "Arihant class nuclear-powered submarine S4* likely to be named INS Arisudan". Hindustan Times. 5 January 2026. Retrieved 5 January 2026.
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