Before 20 15, Pakistan mainly used five Agosta-class conventional submarines and six squid-class submarines imported from France.
In 20 15, Pakistan purchased eight conventional submarines from China. It is speculated that the submarine should be specially customized for Pakistani Railway on the basis of the class 039 conventional submarine, and the export number is s20.
Due to the close relationship between China and the West in the early stage of development, 039 got the opportunity to introduce the advanced diesel generator 396SE84 and its supporting technology produced by MTU company in Germany. Through the efforts of relevant scientific research institutes and construction units, it has been localized in Shaanxi Diesel Engine Factory. This also enables the Type 039 submarine to obtain the most advanced submarine power system in the world, which is rare in China's national defense equipment. Weichai Power is an enterprise in Shandong, so as far as the whole power system is concerned, Shaanxi Heavy Industry is still the mainstay. Of course, some subsystems will still buy Wei Chai.