Hai Hu was commissioned for service on October 9, 1987 and Hai Lung followed on April 9, 1988. The deal for the submarines also included power station components and gas liquifaction plants.
The commissioning of Hai Hu occurred on October 9, 1987, and Hai Lung's entry into service was on April 9, 1988.  The submarine deal involved not only the submarines themselves but also power plant components and gas liquefaction plants.