---
title: "INS Arihant: India's Nuclear Submarine | Model Diplomat"
description: "INS Arihant, India's first indigenously built nuclear submarine, enhances national security by completing the nuclear triad for effective deterrence."
url: "https://modeldiplomat.com/learn/glossary/ins-arihant"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- INS Arihant is India's first indigenously built nuclear-powered ballistic missile submarine, commissioned in 2016 to complete the country's nuclear triad.
- How does INS Arihant complete India's nuclear triad?
- What is the difference between INS Arihant and INS Chakra?
- Which missiles does INS Arihant carry?
- Why is a single SSBN insufficient for credible deterrence?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

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## Timeline

1. 26 July 2009

   The boat was launched by then Prime Minister Manmohan Singh's wife Gursharan Kaur on , a date deliberately aligned with Kargil Vijay Diwas.

2. 10 August 2013

   The reactor achieved criticality on , and the submarine commenced sea trials in December 2014.

3. 5 November 2019

   On , the Prime Minister's Office announced that INS Arihant had completed its first deterrence patrol, a formal declaration that the sea-based leg of the tri…

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In November 2019 India's Prime Minister's Office announced that INS Arihant had completed its first deterrence patrol, formally operationalising the sea-based leg of the nuclear triad.

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