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India has formally commissioned its third indigenous nuclear-powered ballistic missile submarine (SSBN), (S4), into the naval fleet. This vessel is the third in the Arihant-class of submarines, developed under the secretive Advanced Technology Vessel (ATV) project. The commissioning strengthens India's **** (the ability to launch nuclear weapons from land, air, and sea) and significantly enhances its **second-strike capability**, which is the cornerstone of its nuclear doctrine.
The induction of INS Aridhaman marks a major milestone in India's strategic deterrent capabilities. As an SSBN, its primary role is not tactical warfare but to ensure a credible minimum deterrence by providing an assured second-strike capability. This is critical for India's 'No First Use' (NFU) nuclear policy, as it guarantees retaliation even if land and air-based nuclear assets are destroyed in a surprise attack. SSBNs are the most survivable leg of a nuclear triad due to their stealth and ability to remain submerged for extended periods. The operational control of these strategic assets falls under the Strategic Forces Command (SFC), which is part of the Nuclear Command Authority (NCA) chaired by the Prime Minister. This ensures a robust and civilian-controlled command structure for the use of nuclear weapons. The UPSC might ask about the command structure for India's strategic arsenal or the significance of a sea-based deterrent for the NFU policy.
The Arihant-class submarines are a testament to India's growing self-reliance in critical defence technologies. Developed under the Advanced Technology Vessel (ATV) project, these submarines are built indigenously at the Ship Building Centre in Visakhapatnam. INS Aridhaman, at approximately 7,000 tonnes, is larger and more advanced than its predecessors, INS Arihant and INS Arighaat. It is capable of carrying a larger payload, including up to eight K-4 missiles (SLBMs with a range of ~3,500 km) or twenty-four K-15 'Sagarika' missiles. The development of the 'K' family of Submarine-Launched Ballistic Missiles (SLBMs) is as significant as the submarine platform itself, providing India with varied strike range options. The article also distinguishes between SSBNs (ballistic missile submarines for nuclear deterrence) and SSNs (nuclear-powered attack submarines), which are primarily for tactical roles like hunting enemy vessels. India plans to build SSNs indigenously, which will further boost its naval power projection capabilities.
The strengthening of India's nuclear triad has significant implications for regional and global geopolitics. By joining a select group of nations with operational SSBNs (U.S., Russia, China, France, U.K.), India solidifies its status as a major military power. This capability creates a more stable strategic balance in Southern Asia, particularly concerning nuclear-armed neighbors like China and Pakistan. A robust sea-based deterrent reduces the incentive for a pre-emptive strike against India and enhances strategic stability. China's naval expansion and its own formidable fleet of SSBNs provide a direct strategic context for India's push to modernize its underwater deterrent. The ability to patrol vast ocean areas undetected gives India a credible deterrent against threats from distant adversaries, bolstering its blue-water navy ambitions. UPSC may frame questions linking India's naval expansion to its foreign policy objectives in the Indo-Pacific and its role as a net security provider in the region.