Pakistan's Bay of Bengal Signal: What the Hangor-Class Actually Changes

In June 2026, a Pakistan Navy officer said something in Colombo that got a lot of attention in Delhi. Escorting his country's newest submarine home from China, Commodore Omer Farooq called the boat a "game changer" and suggested it would let Pakistan maintain a presence in the Bay of Bengal.

That single sentence has since been recycled into a great deal of alarming commentary. I want to do something different with it here: take the claim seriously, check what is actually verified underneath it, and then apply the two tests that decide whether any naval capability means anything, which are geography and logistics.

The short version is that the hardware is real and genuinely more capable than what Pakistan had before. The eastern deployment is, for now, a statement of intent rather than a demonstrated capability. Both halves of that sentence matter, and most coverage picks one and drops the other.

A word on provenance first, because it belongs up here and not in a footnote. I came to this story through Pradip R. Sagar's reporting for India Today ("Pakistan's Sub Plot in Bay of Bengal," 3 August 2026), which put the Colombo remarks in front of an Indian readership and framed the eastern-deployment question, including the on-record assessments of several retired Indian naval officers. That reporting is worth reading in full, and the credit for surfacing the story is his.

What follows is my own analysis rather than a summary of it. Every figure below was independently checked against primary and specialist sources rather than carried across, which is how I ended up correcting two points that most coverage of this story still gets wrong. Where a claim is contested or single-sourced, I say so rather than smoothing it over, and where I have dropped something for want of verification, I name it at the end.

Cross-paper relevance

• GS2 — India's neighbourhood policy and the Bangladesh reset after the February 2026 election; bilateral management of a small state courted by two rivals; the December 2026 expiry of the Ganga Waters Treaty as leverage that cuts both ways.
• GS3 — Internal and external security: sea-based nuclear deterrence, maritime and coastal security, anti-submarine warfare, defence indigenisation (Project 75I, Project 77), and protection of sea lines of communication.
• GS1 — Geography of the Bay of Bengal, the Strait of Malacca chokepoint, and the strategic value of island territories.
• Essay — Recurring themes on India's rise as a maritime power and on managing relations with smaller neighbours in a multipolar Asia.

1. What was actually commissioned, and when

Start with the verified facts, because the loose version circulating online gets several of them wrong.

Pakistan ordered eight Hangor-class diesel-electric submarines from China in 2015, in a deal reported at $4 to $5 billion. The construction is split: four boats at Wuchang Shipbuilding in Wuhan, and four at Karachi Shipyard and Engineering Works under a transfer-of-technology arrangement. That split is worth noticing on its own, because it is as much an industrial programme for Pakistan as a procurement.

The design is China's S26 export variant, derived from the People's Liberation Army Navy's Type 039A/039B Yuan-class. At roughly 2,800 tonnes submerged and 76 metres, it is the largest submarine the Pakistan Navy has ever operated.

The lead boat, PNS Hangor, was commissioned on 30 April 2026 at Sanya in China, with President Asif Ali Zardari as chief guest. It then sailed home, transiting via Colombo, and reached Karachi in July 2026.

Hold that timeline in your head, because it does a lot of analytical work. As of this writing, Pakistan's first Hangor has been in its home port for a matter of weeks. The Bay of Bengal remark was made while the boat was still on its delivery voyage, before it had ever operated from Karachi.

Here is the fleet picture as it stands. All figures as of July 2026.

A note on that table, since it is the single most common error in current commentary. Several widely circulated graphics still list India as operating two SSBNs. That was correct until 3 April 2026. It is not correct now, for reasons I come to in section 5.

2. What AIP does, and what it does not do

The reason the Hangor-class matters more than Pakistan's existing boats comes down to three letters: AIP, or air-independent propulsion. The Hangor uses a Stirling-cycle system, the same family China fits to its own Yuan-class.

A conventional diesel-electric submarine has an unavoidable vulnerability. It runs on batteries when submerged, and it must periodically come shallow to run its diesels and recharge, a process called snorkelling. That is the moment it is most detectable, by radar, by infrared, by the acoustic signature of running machinery. On batteries alone, a traditional boat is looking at a submerged endurance measured in a couple of days.

AIP changes that arithmetic. It generates power without atmospheric oxygen, letting the submarine stay down for a commonly cited two to three weeks at low speed. That is a real improvement in stealth and patrol persistence, and it is why practically every serious navy is fitting it. India is pursuing two AIP paths of its own, which I come to shortly.

Now the part that gets skipped. AIP extends submerged endurance. It does not extend total endurance, which is set by fuel, food, spare parts and crew fatigue. It does not make a submarine faster. And it does not repeal distance.

This matters because AIP systems typically deliver their endurance at low transit speeds. A submarine sprinting to a distant patrol area burns through its advantage; one that crawls to preserve it takes a very long time to arrive. Either way, the boat spends a large share of its deployment simply getting there and getting back, not doing anything useful on station.

Which brings us to the map.

3. The 1971 precedent, told accurately

Pakistan has done this before, exactly once, and the story is instructive rather than encouraging.

In the run-up to the 1971 war, PNS Ghazi sailed from Karachi on 14 November 1971 on a voyage of roughly 4,800 km around the Indian peninsula. Its mission was to mine India's eastern approaches and to hunt the aircraft carrier INS Vikrant.

It never got the chance. Indian naval planners had already moved Vikrant to the Andaman and Nicobar Islands, and used the ageing destroyer INS Rajput at Visakhapatnam as a decoy, generating radio traffic to suggest the carrier was still in port. On the night of 3 to 4 December 1971, Rajput detected a contact off Visakhapatnam and dropped depth charges. Explosions followed. Ghazi was lost with 93 personnel aboard.

One honest caveat, because this is genuinely disputed and UPSC answers should not overclaim. India attributes the sinking to Rajput's depth charges. Pakistan has long maintained that Ghazi was destroyed by one of the mines it was itself laying, or by an internal accident. The wreck was surveyed and identified by an Indian Navy deep submergence rescue vehicle in a finding reported in February 2024, but the cause remains contested. What is not contested is the outcome: the boat was lost, the mission failed, and Pakistan's navy has effectively been confined to the North Arabian Sea in the five decades since.

The 4,800 km figure is the useful takeaway. That is the distance problem, and no propulsion system yet invented has shortened it.

4. The Bangladesh question, and why the 2026 election changes it

Every serious analysis of a Pakistani eastern deployment arrives at the same conclusion: it is only sustainable with turnaround access to a friendly port. Without somewhere to refuel, resupply and rest a crew, a Hangor in the Bay of Bengal is a one-off demonstration, not a presence.

The candidate everyone points to is BNS Pekua, Bangladesh's first dedicated submarine base, at Pekua in Cox's Bazar. It was inaugurated on 20 March 2023 (originally named for Sheikh Hasina), cost a reported $1.21 billion, was built with substantial Chinese involvement, and can berth six submarines and eight warships. It is the home port for Bangladesh's two Type 035G Ming-class boats, ordered from China in 2013 for a reported $203 million, delivered in November 2016 and commissioned in March 2017 as BNS Nabajatra and BNS Joyjatra.

The warming of Dhaka-Islamabad ties after August 2024 is documented and real, and it sits inside the wider story of India's relations with Bangladesh and the Neighbourhood First framework. Bangladesh sent BNS Samudra Joy to Exercise AMAN-2025 in Karachi (7 to 11 February 2025, the ninth edition, with over 60 countries participating). In November 2025, the Pakistan Navy frigate PNS Saif made a four-day port call at Chattogram, arriving 8 November and departing 12 November, the first visit by a Pakistani warship to Bangladesh in 54 years. Pakistan's naval chief, Admiral Naveed Ashraf, was in Dhaka over the same dates.

So far this tracks the standard narrative. Here is where most current commentary is running on stale assumptions.

Bangladesh held its general election on 12 February 2026. The BNP under Tarique Rahman won 209 of the 297 declared seats, on a turnout of 59.44%, with Jamaat-e-Islami emerging as the principal opposition. The interim period that followed Hasina's ouster is over. There is now an elected government in Dhaka, and Prime Minister Modi publicly congratulated Tarique Rahman on the result.

What has followed is a genuine, if bumpy, attempt at a reset. Bangladesh's foreign minister Khalilur Rahman visited New Delhi on 7 April 2026, the first ministerial visit under the new government, and both sides committed to repairing ties. India has continued diesel supplies through the Bangladesh-India Friendship Pipeline from Numaligarh. The relationship is not smooth (there was a diplomatic row in June 2026 over the treatment of an adviser to the Bangladeshi PM, and the 1996 Ganga Waters Treaty expires in December 2026, which will be a hard negotiation), but "reset attempt with friction" is a very different setting than "post-coup drift."

This should change how the basing question is framed. Granting a foreign navy submarine turnaround rights is not a routine courtesy. It is a sovereign act with obvious costs: it would make Bangladesh a party to a rivalry it has every incentive to stay out of, at the exact moment its new government is trying to stabilise relations with the neighbour that surrounds it on three sides and controls its upstream water. No such arrangement has been announced, and nothing in the public record indicates one is under discussion.

There is also a tactical irony worth sitting with. A submarine's entire value is that nobody knows where it is. A Hangor that must surface and enter a known, watched, satellite-monitored harbour to turn around has just told everyone exactly where it is and roughly when it will be back. Port access solves the endurance problem by surrendering the stealth advantage that made the boat worth deploying.

5. What India is actually protecting

The eastern seaboard is not an ordinary stretch of coast, and the reason has changed significantly in the last two years.

Visakhapatnam hosts the Eastern Naval Command. About 50 km to its south, near Rambilli, India has been building INS Varsha under Project Varsha, a dedicated base for nuclear submarines with underground pens and tunnel access designed to let boats enter and leave without being observed from above. The project spans roughly 20 sq km, and reporting through 2025 and 2026 indicates it is being progressively operationalised.

The reason for all that concrete is the sea-based leg of India's nuclear triad. And here is the update that most graphics have not caught up with:

• INS Arihant, commissioned 2016
• INS Arighaat, commissioned 29 August 2024 at Visakhapatnam
• INS Aridhaman, commissioned 3 April 2026 at Visakhapatnam, in a deliberately low-key ceremony marked by Defence Minister Rajnath Singh

Aridhaman is not simply a third hull. It is substantially larger, with eight missile launch tubes against four on each of the first two boats, roughly doubling its missile load. More importantly, three boats is the threshold at which a navy can realistically sustain a continuous at-sea deterrent, keeping one submarine on patrol at all times while others refit and train. India crossed that line in April 2026. A fourth boat has been in sea trials since late 2025, with induction expected around early 2027.

That is the real strategic weight of the Bay of Bengal. It is not just a trade route. It is where India's second-strike capability lives, and a survivable second strike is the entire foundation of a No First Use nuclear doctrine, which sits at the centre of India's nuclear diplomacy and strategic autonomy. Anything that degrades the secrecy of SSBN patrol patterns matters far more than the tonnage involved would suggest. That is the legitimate core of Indian concern, and it holds regardless of whether a Pakistani boat ever shows up.

6. India's response is mostly already funded

The counter to a more crowded eastern seaboard is not one system. It is a layered architecture, and most of it predates the Hangor commissioning.

Surveillance. India operates 12 P-8I Poseidon long-range maritime patrol aircraft, from INS Rajali and INS Hansa, which are among the more capable submarine-hunting platforms in service anywhere. MH-60R Seahawk helicopters have been inducted into two squadrons for shipborne anti-submarine work. The Information Fusion Centre for the Indian Ocean Region at Gurugram, operational since December 2018, fuses AIS, satellite, coastal-radar and partner-nation feeds with international liaison officers embedded on site, which is how unusual movements get flagged early.

Geography. The Andaman and Nicobar Command, established in 2001 at Port Blair, remains India's only integrated tri-service theatre command. It sits astride the western approaches to the Strait of Malacca, which is the chokepoint through which anything entering the Bay of Bengal from the east must pass. Infrastructure there is being upgraded, including airfields, jetties and surveillance.

Fleet. Three programmes are running in parallel:

• Project 75 delivered six Kalvari-class (Scorpène) boats, completed with INS Vagsheer on 15 January 2025. Three additional Scorpènes were announced in July 2024, at a reported ~₹36,000 crore, to be fitted with DRDO's indigenous fuel-cell AIP.
• Project 75(I) is the six-boat AIP programme with Germany's TKMS partnered with Mazagon Dock, based on an enlarged Type 214 derivative. The Finance Ministry cleared roughly ₹70,000 crore, contract negotiations have concluded, and as of mid-2026 the proposal awaits final approval. It has been in gestation for well over a decade, which is a fair criticism to make in an answer.
• Project 77 is the nuclear attack submarine programme. The Cabinet Committee on Security cleared it in October 2024 with an initial ₹40,000 crore for two boats of roughly 10,000 tonnes, to be built at the Ship Building Centre in Visakhapatnam with significant private-sector participation. First deliveries are projected around 2036-37, which is the honest timeline and a reminder that this is a generational programme, not a response to any 2026 headline.

Note what is missing from Pakistan's column in that table: no nuclear-powered submarine, in service or on order. Nuclear propulsion is what actually solves the endurance-and-distance problem that AIP only softens.

7. The frame that actually matters

If you write an answer that is only about one Pakistani submarine, you have missed the question.

The durable trend is the convergence of Chinese naval influence across India's maritime periphery. Most of Pakistan's naval inventory is now Chinese-origin, which over time creates real interoperability with the PLA Navy in doctrine, communications and logistics. Bangladesh's submarines, its submarine base, and much of its naval modernisation are Chinese-supplied. And China's own presence in the Indian Ocean has grown well beyond warships: by late 2025, multiple Chinese survey and research vessels, including Shi Yan 6, Shen Hai Yi Hao and two Lan Hai vessels, were operating across the region.

Those research ships deserve a line of their own, because they are the quieter story. Seabed mapping, salinity and temperature-layer profiling and current measurement are exactly the oceanographic inputs that make submarine navigation and sonar prediction possible in unfamiliar water. They are legally civilian, which makes them awkward to challenge, and strategically dual-use, which makes them impossible to ignore. This is grey-zone activity: below the threshold that triggers a response, cumulative in effect.

India's declared answer runs through MAHASAGAR (Mutual and Holistic Advancement for Security and Growth Across Regions), announced by the Prime Minister in Mauritius in March 2025 as the successor to the 2015 SAGAR vision. The upgrade is more than branding: SAGAR was regional and security-led, while MAHASAGAR adds economic, technological and climate dimensions and extends the geography toward the wider Global South. Whether it delivers is a fair open question, and a good answer says so.

The takeaway

For the exam hall, I would hold four things together.

One. The capability is real but young. One boat of eight, commissioned 30 April 2026, in home port since July 2026, with a crew still working up on the most complex platform that navy has ever operated. Mastering a new submarine class takes years, not months.

Two. Geography has not moved. Karachi to the Bay of Bengal is the same roughly 4,800 km voyage Ghazi made in 1971, and AIP extends submerged endurance without extending range or speed. A sustained eastern presence needs port access; port access surrenders stealth. That is a genuine dilemma for Pakistan, not a solved problem.

Three. The Bangladesh variable is more constrained than the commentary suggests. There is an elected government in Dhaka since February 2026, an active attempt at a reset with Delhi, and no announced arrangement of any kind on submarine access. Warmer defence contact is documented; alignment is not. Conflating the two is the most common analytical error on this topic, and the Ganga Waters Treaty expiry in December 2026 gives both capitals strong reasons to keep the relationship workable.

Four. The eastern seaboard genuinely matters more now than it did a decade ago, and the reason is India's own, not Pakistan's. With INS Aridhaman commissioned in April 2026, India has three SSBNs and, for the first time, a credible continuous at-sea deterrent operating out of the Bay of Bengal. Protecting the secrecy of that patrol cycle is a first-order national interest.

The sharpest version of this answer resists both available clichés. It is not "a grave new threat to India's east," and it is not "nothing to see here." It is a modest, real capability increment attached to a much larger and slower structural shift in who builds, arms and services the navies around India. The submarine is the headline. The shipyards are the story.

For rolling coverage as the remaining seven boats are delivered and the Project 75(I) contract is signed, see our sister site Ujiyari. For the exam-oriented foundations underneath this piece, start with our notes on maritime and coastal security, India-Bangladesh relations, and the Indo-Pacific, Quad and ASEAN.

Bharat

Sources (each claim checked against the cited originals; figures carry as-of dates in the text). Story credit: Pradip R. Sagar, "Pakistan's Sub Plot in Bay of Bengal," India Today, 3 August 2026, which prompted this piece and carries the on-record comments of the retired Indian naval officers quoted there; those quotes are his reporting and are not reproduced here. Everything below was verified independently. Naval News, Geo TV, Asian Military Review and Baird Maritime: PNS Hangor commissioning at Sanya, 30 April 2026, and class specifications. Quwa and NTI: Hangor/S26 programme structure, 2015 order, Wuchang and KSEW build split, and Pakistan Navy's existing Agosta 70 and Agosta 90B fleet. Baird Maritime: Commodore Omer Farooq's Bay of Bengal remarks in Colombo, June 2026, and Hangor's arrival at Karachi. Navy Recognition, BenarNews and The Financial Express (Dhaka): BNS Pekua inauguration on 20 March 2023, reported $1.21 billion cost and six-submarine, eight-warship capacity. Wikipedia and Quwa (cross-checked): Bangladesh's Type 035G order, 2016 delivery and March 2017 commissioning. BSS News, UNB, Dhaka Tribune and The Business Standard: PNS Saif at Chattogram, 8 to 12 November 2025. Dhaka Tribune and Dawn: Exercise AMAN-2025, Karachi, 7 to 11 February 2025, and Bangladesh's participation. IPU Parline, Al Jazeera and Dhaka Tribune election results: Bangladesh general election of 12 February 2026, BNP's 209 seats and 59.44% turnout. NUS-ISAS and The Diplomat: Khalilur Rahman's New Delhi visit of 7 April 2026 and the June 2026 diplomatic row; Ganga Waters Treaty expiry, December 2026. ThePrint, Baird Maritime and Army Recognition: INS Aridhaman commissioning on 3 April 2026, eight launch tubes, and the fourth boat's sea trials. Wikipedia and Business Standard: INS Arighaat commissioning, 29 August 2024, and Project Varsha at Rambilli. TKMS Group, Naval Today and MDL disclosures: Project 75(I) status, Type 214 derivative and ₹70,000 crore approval. Wikipedia and IDRW: Project 77 CCS clearance, October 2024, ₹40,000 crore and 2036-37 timeline. European Security & Defence and Naval News: INS Vagsheer commissioning, 15 January 2025, and the three additional Scorpènes with DRDO AIP. Drishti IAS and PIB: P-8I fleet, IFC-IOR (inaugurated December 2018) and Andaman and Nicobar Command (2001). CSIS Hidden Reach, ORF and Indian Defence News: Chinese survey and research vessel activity in the Indian Ocean, late 2025. USSC, ORF and MEA missions: MAHASAGAR announcement, March 2025. Sputnik India, Business Standard and Madras Courier: PNS Ghazi's 1971 deployment, the INS Rajput decoy operation, the loss of 93 personnel on 3-4 December 1971 and the disputed cause. Deliberately excluded for want of independent verification: reported Babur-3 missile fitment on the Hangor-class, and reported airbase development at Lalmonirhat.