Pakistan's New Submarine Threat Pushes India's Underwater Defense to the Limit

Pakistan's new Chinese-built Hangor-class submarine, PNS/M Hangor, officially entered service in April 2026 and completed its delivery run in June 2026, arriving in Karachi after sailing via Colombo. This move, part of an eight-submarine deal with China, gives Pakistan new reach into crucial maritime zones like the Bay of Bengal, potentially challenging India's long-held dominance there. A Pakistani naval officer even publicly stated the submarine would allow a presence in these waters, directly hinting at a shift in regional naval dynamics. This development ramps up the long-standing naval rivalry between India and Pakistan in the Indian Ocean. Pakistan's Hangor-class submarines come equipped with advanced stealth features and Air Independent Propulsion (AIP), allowing them to stay underwater much longer, making them harder to detect. They can also carry Anti-Ship Cruise Missiles (ASCMs) and potentially even nuclear-capable Babur-3 missiles, offering Pakistan a stronger 'sea denial' capability against India's larger navy. India is not sitting idle; it recently commissioned INS Aridhaman, its third nuclear-powered ballistic missile submarine, and is fast-tracking Project 75I to build six advanced Type-214 conventional submarines with Germany, alongside boosting its Anti-Submarine Warfare (ASW) fleet with new Anti-Submarine Warfare Shallow Water Craft (ASW-SWC). As both nations enhance their underwater might, the Bay of Bengal, home to India's Eastern Naval Command and its secret nuclear submarine base INS Varsha, becomes an even more sensitive area. India is also pushing its SHANTI Framework for regional maritime cooperation to balance out military competition with shared responsibility. The coming years will see intense efforts by both sides to project naval power and counter threats, turning the Indian Ocean into a critical chessboard for underwater warfare and strategic maneuvering.