Strengthening Deterrence: India’s Submarine Capabilities

INS Aridhaman is the third nuclear-powered ballistic missile submarine (SSBN) in India’s Arihant-class programme, representing a significant advancement in India’s strategic defence capabilities. As part of the sea-based leg of India’s nuclear triad, it enables the country to launch nuclear weapons from underwater platforms, complementing land-based missiles and air-delivered systems.

The nuclear triad refers to a country’s ability to deliver nuclear weapons through three platforms: land, air, and sea. With INS Aridhaman, India strengthens its second-strike capability, which is crucial for deterrence. Unlike land or air assets, submarines are stealthy and difficult to detect, ensuring survivability even after a first strike by an adversary.

Compared to earlier submarines, INS Aridhaman has enhanced missile capacity and range, making it a more potent deterrent. This development places India among a select group of nations with robust nuclear triad capabilities and reinforces its commitment to maintaining credible minimum deterrence under its ‘No First Use’ policy.

Sea-based nuclear deterrence is gaining prominence due to the evolving nature of global and regional security dynamics. Submarines like INS Aridhaman provide stealth, mobility, and survivability, making them the most secure component of a nuclear arsenal. In a scenario where land-based or air-based assets are vulnerable, sea-based platforms ensure a credible second-strike capability.

In the Indian context, the growing presence of China in the Indian Ocean Region (IOR), including surveillance and research vessels with dual-use capabilities, poses strategic challenges. Additionally, Pakistan’s naval modernization adds another layer of complexity. Strengthening sea-based deterrence helps India counter these threats and maintain strategic balance.

Furthermore, modern conflicts increasingly involve multiple domains, as seen in West Asia where maritime routes like the Strait of Hormuz have become critical. Thus, investing in sea-based deterrence is essential for safeguarding India’s maritime interests, trade routes, and national security in an interconnected and volatile world.

INS Aridhaman represents a technological upgrade over its predecessors, INS Arihant and INS Arighat. It is a larger 7000-tonne submarine with significantly enhanced missile carrying capacity. While earlier submarines could carry around 12 K-15 missiles and 4 K-4 missiles, INS Aridhaman can reportedly carry up to 24 K-15 missiles and 8 K-4/K-5 nuclear-tipped missiles.

This increased payload capacity enhances India’s deterrence by allowing more flexible and powerful strike options. The submarine is also believed to incorporate improved stealth features, propulsion systems, and operational endurance, making it more effective in long-duration missions.

Such advancements are part of India’s broader effort to incrementally upgrade its SSBN fleet. Similar evolutionary approaches have been adopted by countries like the United States and Russia in their submarine programmes. Thus, INS Aridhaman reflects India’s growing expertise in indigenous defence technology and strategic innovation.

Nuclear submarines play a pivotal role in modern deterrence strategies due to their stealth and survivability. As part of a nuclear triad, SSBNs ensure that a country retains the ability to retaliate even after suffering a nuclear attack, thereby strengthening deterrence. Their ability to remain undetected for long periods makes them a cornerstone of second-strike capability.

However, the increasing reliance on such platforms also raises concerns. The high cost of development and maintenance can strain defence budgets, especially for developing countries. Additionally, the deployment of nuclear submarines may contribute to arms races and regional instability, particularly in sensitive areas like the Indo-Pacific.

From a strategic perspective, while nuclear submarines enhance security, they also necessitate robust command-and-control systems to prevent accidental or unauthorized use. Therefore, their role must be balanced with diplomatic efforts, arms control measures, and confidence-building mechanisms to ensure strategic stability and global security.

India’s SSBN programme is a strong example of its commitment to Atmanirbhar Bharat (self-reliance) in defence. The development of nuclear-powered submarines involves complex technologies such as nuclear propulsion, missile integration, and advanced materials, which India has progressively mastered through indigenous efforts.

The programme gained momentum due to challenges in global defence supply chains, especially during conflicts like the Russia-Ukraine war. India’s reliance on Russia for defence equipment highlighted the need for domestic capabilities. The SSBN project, therefore, represents a strategic shift towards reducing dependency on foreign suppliers.

Looking ahead, India plans to develop nuclear attack submarines (SSNs) by 2036 and 2038, further strengthening its indigenous capabilities. Similar efforts in countries like China demonstrate how domestic production can enhance strategic autonomy. Thus, INS Aridhaman is not just a military asset but also a symbol of technological progress and strategic independence.

India faces several challenges in expanding its submarine-based deterrence capabilities. One of the primary issues is the high cost associated with building and maintaining nuclear submarines. Balancing defence spending between submarine programmes and other military needs remains a critical concern.

Technological challenges also persist, particularly in integrating advanced systems such as Artificial Intelligence, autonomous technologies, and next-generation propulsion. Keeping pace with global leaders like the United States and China requires sustained investment in research and development.

Additionally, geopolitical competition, especially with China, adds pressure on India to accelerate its naval modernization. The need for skilled manpower, robust infrastructure, and efficient project management further complicates the process. Addressing these challenges will require a comprehensive strategy focusing on innovation, resource optimization, and international collaboration.