Submarine Dominance And India’s Sea-Based Nuclear Deterrence

Context

The article examines the reported commissioning of INS Aridhaman and its implications for India’s nuclear triad, maritime deterrence, and defence self-reliance.
It argues that strengthening sea-based nuclear capability has become increasingly important amid a worsening strategic environment in the Indian Ocean and the changing nature of warfare.
Source: “Bolstering deterrence through submarine dominance,” The Hindu, April 11, 2026.

SSBN Programme and the Aridhaman Development

Aridhaman Mention: Defence Minister Rajnath Singh’s April 3 post on X mentioning “Aridhaman” triggered speculation about the quiet commissioning of INS Aridhaman, the third submarine in India’s SSBN programme.
Sequence of Induction: INS Arihant was commissioned in 2016, INS Arighat in 2024, and INS Aridhaman is widely speculated to have entered service after reaching final trial stages.
Next Vessel: The next submarine of the Arihant class is likely to be commissioned next year.
Capability Upgrade: INS Aridhaman represents a gradual upgrade over INS Arihant and INS Arighat in terms of size and missile-carrying capacity.

Enhanced Firepower of INS Aridhaman

Larger Platform: INS Aridhaman is described as a larger 7000-tonne vessel.
Missile Load: It can reportedly carry up to 24 K-15 Sagarika missiles and up to eight nuclear-tipped K-4 or K-5 missiles.
Comparative Advantage: Earlier submarines in the series could carry 12 K-15 Sagarika missiles and four K-4 missiles.
Deterrence Value: This enhanced payload strengthens India’s ability to sustain a more credible sea-based nuclear deterrent.

Nuclear Triad and Strategic Deterrence

Nuclear Triad Meaning: The commissioning of INS Aridhaman strengthens India’s nuclear triad, namely the ability to launch strategic nuclear delivery systems from land, sea, and air.
Global Position: Apart from India, only the P5 countries — the U.S., Russia, China, France and the U.K. — are stated to possess nuclear triad capabilities.
Maritime Deterrence: Sea-based deterrence is presented as a vital component of India’s broader deterrence posture.
Policy Context: India’s nuclear outlook remains anchored in its no first use policy.

Indian Ocean Security Environment

Chinese Presence: The Indian Ocean strategic environment is described as worsening due to the increasing Chinese presence through research and survey vessels.
Dual-Use Concern: These vessels possess dual-use technologies and may be deployed for intelligence gathering.
Regional Deterrence Need: Stronger sea-based deterrence is seen as necessary to forestall adversarial manoeuvres by both China and Pakistan.
Earlier Maritime Calm: The Indian Ocean had long remained relatively dormant because of the absence of major maritime security conflict, but this situation is now changing.

Changing Nature of Warfare

Multi-Domain Warfare: Modern warfare is no longer confined to one domain and can rapidly shift across land, air and sea.
West Asia Illustration: The evolving conflict in West Asia is cited as an example where initial American and Israeli air campaigns against Iran quickly acquired a maritime dimension.
Strait of Hormuz Relevance: The Strait of Hormuz has emerged as the epicentre shaping the future course of that war.
Operation Sindoor Example: India’s measured counter-terror response against Pakistan last year also showed that a naval dimension could have become part of the campaign.
Strategic Implication: The possibility of cross-domain spillover makes strengthening deterrence across all domains essential.
National Security Priority: This complexity of warfare reinforces why possession of nuclear triad capabilities and stronger deterrence will remain central to India’s national security apparatus.

Self-Reliance in Defence Production

Indigenous Capability Push: The SSBN project is presented as having significantly advanced India’s search for self-reliance in defence production.
Supply Chain Pressure: Ongoing conflicts in multiple strategic regions are expected to strain global defence supply chains.
Russia-Ukraine War Effect: The prolonged Russia-Ukraine war has accelerated Indian efforts toward defence self-reliance, especially because Russia remains a traditional defence partner for India.

Future Direction of India’s Submarine Programme

Fourth Arihant-Class Vessel: Plans to induct a fourth Arihant-class submarine are likely to shape the next phase of the SSBN programme.
Indigenous SSN Goal: India aims to commission its first fully indigenously designed nuclear attack submarine by 2036 and the second by 2038.
Strategic Shift: The rapid expansion of India’s nuclear-powered submarine programme suggests that submarine dominance is becoming a key pillar of New Delhi’s deterrence strategy.

Emerging Challenges

Resource Allocation: A major challenge will be balancing expenditure between upgrading the submarine programme and investing in emerging technologies.
Technological Adaptation: Artificial Intelligence and autonomous systems are identified as important technologies for future vessel design and production.
China Comparison: Since Indian naval capabilities are continually compared with China’s, keeping pace with Beijing is presented as a critical strategic requirement.

India’s Multi-Domain Warfare, Nuclear Triad And Maritime Deterrence

Multi-Domain Warfare (MDW)

Core Idea: MDW means synchronised operations across land, sea, air, cyber, space, and increasingly information or cognitive domains.
Integrated Battle Groups (IBGs): IBGs are leaner, agile, mission-oriented formations meant to improve faster response, jointness, and operational flexibility.
Defence Cyber Agency (DCyA): DCyA was established as a specialised tri-service agency to address emerging threats in the cyber domain.
Defence Space Agency (DSA): DSA was created as a specialised tri-service agency for emerging threats in the space domain, including support to military space operations.
Chief of Defence Staff (CDS): The CDS was created to strengthen jointness, administer tri-service organisations, and bring cyber- and space-related tri-service structures under unified military oversight.

Nuclear Triad

Meaning: A nuclear triad means the ability to launch nuclear weapons from land, air, and sea.
Strategic Value: It strengthens the credibility and survivability of deterrence by ensuring retaliation capability even after a first strike.
Land Leg: The land leg includes the Agni series, with Agni-5 test-fired under the aegis of the Strategic Forces Command.
Air Leg: The air leg consists of combat aircraft capable of delivering nuclear gravity bombs, as reflected in the triad structure given in the source text.
Sea Leg: The sea leg rests on SSBNs and is considered the most survivable component because of stealth and second-strike potential.

Maritime Deterrence

Meaning: Maritime deterrence refers to using naval capability to prevent hostile action by ensuring costs and retaliation remain credible.
Indian Ocean Context: It is central to India’s effort to balance extra-regional and adversarial presence in the Indian Ocean.
Continuous At-Sea Deterrence: A deployed SSBN at sea preserves retaliatory capability even if land-based assets are targeted first.
Carrier Battle Groups: The combined operations of INS Vikramaditya and INS Vikrant reflect India’s effort to enhance maritime security and power projection in the Indian Ocean and beyond.

SSBN Programme And Arihant Class

SSBN Meaning: SSBN stands for nuclear-powered ballistic missile submarine, designed to carry submarine-launched nuclear missiles.
Programme Identity: The Arihant class is India’s indigenous SSBN programme under the Advanced Technology Vessel project.
INS Arihant: INS Arihant completed its first deterrence patrol in 2018, marking completion of India’s survivable nuclear triad.
INS Arighaat: INS Arighaat, the second Arihant-class submarine, was commissioned on 29 August 2024 at Visakhapatnam and was described as strengthening India’s nuclear triad and deterrence.
Follow-on Boats: Two larger follow-on submarines, S4 and S4*, are under construction, showing expansion of sea-based deterrence as noted in the source text.
Missile Fit: Arihant-class SSBNs are associated with K-15 and K-4 submarine-launched ballistic missiles, giving different ranges within the sea-based deterrent.

UPSC Prelims Quiz

Practice exam-oriented current affairs questions daily and track your preparation effectively.

Attempt Quiz →