[6] First unveiled to the public in 2018, the future submarines are envisaged to undertake anti-access/area denial operations within Pakistan's exclusive economic zone, through the use of heavyweight torpedoes and anti-ship cruising missiles.

[13] However, owing to a dearth of public funds due to the 2009 global financial crisis and the high cost of the submarines forced Pakistan to terminate the proposed deal.

[15] In April 2015, during a briefing to the National Assembly Standing Committee on Defence, PN representatives disclosed that the Pakistani government, then headed by prime minister Nawaz Sharif, had approved the purchase of eight attack submarines from China, at an estimated cost of US$4–5 billion.

[18] Six months later, in October 2016, the director of the CSIC confirmed the sale of the submarines to Pakistan during an interview with the Chinese state-run People's Daily Online media outlet.

[18] Of the two mentioned ordnance, it is assumed the submarine would eventually carry the Chinese-origin Yu-6 heavyweight torpedoes or the CM-708UNB sub-launched anti-ship missile (AShM).

[18] In addition to the aforementioned two, the eight submarines are also widely expected to carry the Pakistan-developed nuclear-capable Babur-3 submarine-launched cruise missile (SLCM), capable of covering a 450 km range.

[18][28] In January 2017, Admiral Muhammad Zakaullah, the-then PN Chief of Naval Staff, announced that the eight future submarines would be eponymously christened as the Hangor-class, after PNS Hangor (S131), a Daphné-class submarine which the PN had used to sink INS Khukri, a Blackwood-class frigate of the Indian Navy, during the Indo-Pakistani naval hostilities of 1971.

[30] Between 2015 and 2016, open-source intelligence inputs revealed that KSEW had expanded its infrastructure capabilities at its Karachi facility, indicating that the submarines would be built there.

[9] The only known public information about the construction progress was revealed in December 2021, when KSEW announced that it had conducted a steel-cutting ceremony for the Tasnim, the first submarine of its batch.

[34] (Note : The submarines' names are yet to be revealed entirely) China Shipbuilding Trading Company (CSTC) Karachi Shipyard & Engineering Works (KSEW)