Pakistan is quietly rewriting its naval strategy, and it’s doing so by sending a clear signal directly into India's eastern backyard.
For the first time since the devastating 1971 war, Islamabad is actively planning to deploy submarines into the Bay of Bengal. This isn't just a routine training cycle or a minor fleet shuffle. It’s a deliberate power play made possible by Chinese defense engineering and major political shifts in Bangladesh.
If you follow South Asian geopolitics, you know the Bay of Bengal has essentially been an Indian lake for more than 50 years. Pakistan’s naval footprint there evaporated after its eastern wing broke away to become Bangladesh in 1971. By pushing back into these waters, Islamabad is forcing New Delhi to look over both shoulders at once.
The Chinese Tech Making This Possible
The catalyst for this strategic shift is the arrival of the PNS Hangor. Built in China, this is the lead vessel of an eight-submarine fleet that Islamabad is inducting to replace its aging fleet. Commodore Omer Farooq, the mission commander who escorted the submarine from China, openly laid out the plan during a port call in Sri Lanka, confirming that the new hardware is specifically intended to re-establish a presence in the Bay of Bengal.
What makes this deployment technically feasible is Air-Independent Propulsion (AIP). Traditional diesel-electric submarines have a major flaw: they need to surface or use a snorkel every few days to run their engines and recharge their batteries, making them highly vulnerable to modern radar and maritime patrol aircraft.
AIP changes that equation entirely. The Hangor-class uses Stirling engine AIP technology derived from China's Type 039B Yuan-class design. This system allows the submarine to stay completely submerged for up to three weeks at a time without needing atmospheric oxygen.
Conventional Submarine: Must surface/snorkel every 2-3 days
Hangor-Class (AIP): Remains submerged for up to 21 days straight
For Pakistan, this extended endurance is everything. It means a submarine can slip out of Karachi, navigate around the southern tip of India, and sustain a covert patrol inside the Bay of Bengal without giving away its position.
The 1971 Ghost and a Changing Dhaka
The name Hangor carries massive historical baggage. In December 1971, a previous Pakistani submarine named PNS Hangor torpedoed and sank the Indian frigate INS Khukri in the Arabian Sea. It was a tactical victory for Pakistan's submarine arm, but it couldn't stop a total strategic collapse. On the eastern front, Pakistan's long-range submarine PNS Ghazi sank mysteriously off the coast of Visakhapatnam while trying to mine the harbor. The war ended with the surrender of Pakistani forces in Dacca and the complete eradication of Pakistan's naval presence in the east.
Resurrecting the Hangor name for this new class is a deliberate nod to that history. But the physical deployment back to the east relies on a brand-new political landscape.
For decades, Bangladesh's government under Sheikh Hasina maintained tight, friendly ties with India, keeping Islamabad at arm's length. That dynamic crumbled when Hasina’s administration fell, paving the way for an interim regime led by Muhammad Yunus. Pakistan has aggressively used this political window to rebuild broken bridges, rapidly stepping up military-to-military engagement with Dhaka. Without this political opening in Bangladesh, trying to project naval power into the Bay of Bengal would be a logistical dead end for Pakistan.
Forcing a Two-Front Naval Dilemma on India
From a pure defense perspective, this isn't about Pakistan attempting to match the Indian Navy ship-for-ship. India maintains overwhelming naval superiority, operating multiple nuclear-powered submarines, two aircraft carriers, and a massive fleet of surface combatants.
Instead, Pakistan is practicing classic sea denial. By placing stealthy, AIP-equipped assets near India’s Eastern Naval Command, Islamabad complicates New Delhi’s defense calculations.
India has traditionally kept its most advanced anti-submarine warfare assets focused on the Arabian Sea to counter the immediate threat from Karachi. Now, the Indian Navy will have to divide its attention and its maritime surveillance assets, like the P-8I Poseidon fleet, to monitor deep subsurface threats on both sides of the peninsula.
There is also the heavy shadow of Beijing to consider. Every piece of hardware in Pakistan's new naval task group—including the Type 054A/P stealth frigates that escorted the Hangor during its voyage—is Chinese-built. Indian defense planners are looking at this as a highly coordinated, dual-front underwater challenge. A Pakistani submarine operating in the Bay of Bengal provides a perfect data-gathering tool, mapping out thermal layers and acoustic profiles that could easily be shared with the Chinese navy.
The Immediate Reality on the Water
While the strategic signaling is loud, the actual balance of power won't shift overnight. Building, testing, and fully integrating eight advanced submarines takes years. Only the first hull has arrived in home waters, and achieving a continuous, permanent rotation in the Bay of Bengal requires multiple operational vessels, highly trained crews, and reliable forward logistics.
India is already responding by tightening its security posture and accelerating its own underwater surveillance networks in the eastern waters. But the era of treating the Bay of Bengal as a secure, uncontested zone is officially over.
If you are tracking security dynamics in the Indian Ocean, watch the upcoming naval exercises and port visits in the region. The real indicator of how fast this strategy matures will be whether these new Pakistani submarines begin making routine operational stops in friendly regional ports, turning what used to be a rare long-range transit into a normalized presence. New Delhi's move next will likely involve deploying more static underwater acoustic sensors and increasing permanent maritime patrols along the Andaman and Nicobar chain to lock down the entry points.
This video breaks down how Chinese defense technology is actively shaping the underwater balance of power between India and Pakistan: How China Is Transforming Pakistan Navy's Underwater Power. It provides crucial visual context on the technical capabilities of these new hulls and what their deployments mean for regional anti-submarine operations.
