India's Sea-Based Nuclear Deterrent Set for Major Boost with INS Aridhaman Commissioning
India's strategic naval capabilities are poised for a significant enhancement as the country's third indigenous Arihant-class nuclear-powered ballistic missile submarine (SSBN), INS Aridhaman (designated S4), is likely to be commissioned by April-May this year. This development marks a critical step in strengthening India's sea-based nuclear deterrent, according to defence sources.
Final Stages of Sea Trials Underway
The commissioning of INS Aridhaman is expected by this summer, as the submarine is currently in the final stages of sea trials. A defence source confirmed to TOI that the vessel is undergoing rigorous testing to ensure operational readiness. This timeline aligns with statements made by Navy chief Admiral D K Tripathi in December, who had indicated that INS Aridhaman would be commissioned within the current year.
Enhanced Capabilities and Specifications
Built under the Advanced Technology Vessel (ATV) project at the Ship Building Centre in Visakhapatnam, INS Aridhaman represents a notable upgrade over its predecessors. With a displacement of 7,000 tonnes, it is larger than INS Arihant and INS Arighaat, which weigh 6,000 tonnes each. This increased size allows for enhanced capabilities, particularly in carrying long-range missiles.
- Armament: INS Aridhaman will be armed with 24 K-15 Sagarika submarine-launched ballistic missiles (SLBMs) with a range of 750 km and eight K-4 SLBMs boasting a range of 3,500 km. These missiles are capable of reaching most parts of Asia, significantly extending India's strategic reach.
- Stealth Features: The submarine is equipped with an 83 MW pressurised water reactor and advanced sonar suites, including indigenous USHUS and Panchendriya systems for superior target detection. Improved acoustic damping with anechoic tiles reduces noise, making it harder for adversaries to detect.
- Base Location: Once operational, INS Aridhaman will be based at Project Varsha, a high-security facility with underground pens near Visakhapatnam, ensuring secure deployment.
Strategic Implications for India's Defence
The commissioning of INS Aridhaman will bring India's operational ballistic missile submarine fleet under the Strategic Forces Command (SFC) to three vessels for the first time. This milestone moves the country closer to achieving 'Continuous At-Sea Deterrence', a strategic defence policy where a nation maintains at least one SSBN on patrol 365 days a year. As a stealthy underwater platform, INS Aridhaman significantly boosts India's "second-strike" capability—the ability to retaliate effectively after a nuclear attack, thereby enhancing national security.
Broader Naval Modernization Efforts
In addition to INS Aridhaman, the Indian Navy is actively pursuing other submarine projects to modernize its fleet:
- Akula-Class Submarine: The Navy is securing an Akula-class SSN nuclear-powered attack submarine from Russia, commonly referred to as "Chakra III", with expected delivery by 2027 or early 2028.
- Project-75(I): India and Germany are in the final stages of negotiating a $8-10 billion deal to build six advanced, conventional diesel-electric submarines equipped with Air-Independent Propulsion (AIP) technology, enhancing underwater endurance and stealth.
Regional Security Context
These acquisitions are timely, given regional developments. Pakistan is acquiring eight advanced Hangor-class diesel-electric attack submarines from China under a $5 billion deal signed in 2015, aimed at bolstering its naval capabilities. India's submarine advancements, including INS Aridhaman, are crucial for maintaining a strategic balance and deterrence in the region.
Overall, the commissioning of INS Aridhaman represents a pivotal moment in India's defence strategy, reinforcing its position as a formidable naval power with advanced nuclear capabilities.
