Type 814A spy ship

Type 814A spy ship with NATO reporting name Dadie(大谍, meaning Big Spy) is a type of Chinese spy ship in service (as of 2022) with the People's Liberation Army Navy (PLAN). Originally, a total of four ships were planned, but eventually, only one was completed due to the availability of newer designs. PLAN originally issued a requirement for four spy ships to meet its urgent need, after the failure of the earlier cancelled Type 812. To speed up the program, PLAN suggested adopting the hull of Type 635C hydrographic survey ship. The 1st Directorate of the 708th Institute of China State Shipbuilding Corporation, which is also more commonly known as China Shipbuilding and Oceanic Engineering Design Academy (中国船舶及海洋工程设计研究) nowadays, was assigned to design the ship.