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Dongxiu-911 Jinyou-class Type 648 submarine repair ship

In the 1970s, the types of naval vessels in China became more and more perfect. However, marine repairs and emergency repairs for shipbuilding increasingly failed to keep up with the modernization of the navy. In order to build a modern maritime repair ship as soon as possible, the Naval Equipment and Technology Department formally issued a design task book for the mobile submarine repair fleet in October 1975, with 708 3-room designs. The mobile repair fleet is mainly composed of submarine repair ships and 19,620 kN (2,000 ton force) class floating ships (unbuilt), which were built by Bohai Shipyard. It took 10 years from the beginning of design, research, demonstration, and completion of construction to the PLAN.

Before World War II, the role of ship repairing ships had not been generally valued, so that during the war, the belligerent countries had to vigorously convert other ships into repair ships for emergency repairs. By the 1970s, types of naval submarines are maturing, however, ship building and repair at sea is increasingly failing to repair the Navy's modernization needs. China's navy submarine type became more and more perfect in the 1970s, but China's navy submarine type became more and more perfect in the 1970s In the era, the types of submarines in China's navy are becoming more and more perfect. Ship repairs and emergency repairs at sea are less and less able to keep up with the needs of naval modernization. As soon as possible, the Navy neede to raise the level of the construction of a modern repair ships at sea, naval equipment and technology.

To support the rapidly growing submarine fleet, the PLA Navy requested the Jinyou-class (formerly Dongshui 911) submarine repair ship in October 1975. The design work was assigned to 708 Institute (namely, China Shipbuilding and Ocean Engineering Design and Research Institute) located in Shanghai. It was built at Bohai Shipyard from July 1980 to December 1984, and delivered on January 1985. The first and only Type 648 submarine repair ship finally entered service in the PLA Navy's East China Sea Fleet in 1985, the No. 911 Dongxiu. The ship is designed to provide basic repairs and maintenance, as well as supply fuel and fresh water to the submarine. It can also charge the batteries on the submarine.

The ship is a modern maritime repair and work ship developed by our country, all using domestically-made equipment and relatively complete equipment. As a repair ship dedicated to submarines, it is also rare in the world. It has many features such as advanced technological process, spacious working place, etc. It also has many functions such as charging, charging, and providing oil and water replenishment. Design waterline length: 78.7 meters, ship length: 84 meters, depth: 5.8 meters, width: 12.4 meters, draft: 4.0 meters, displacement: 1962 tons, main engine: 2 modified D39, rated power 1360 kilowatts (1850 horsepower) speed: 15.1 knots Capacity: 105 people. Endurance: 2000 nautical miles. Self-sustainability: 20 days. Equipment: 4 Type 61 25mm double-barreled guns.

The ship is a modern offshore repair work ship developed by our country, all using domestically-made equipment and relatively complete equipment. As a repair ship dedicated to submarines, it is also rare in the world. It has many features such as advanced technological process, spacious working place, etc. It also has many functions such as charging, charging, and providing oil and water replenishment. The ship was researched and designed in the mid-1970s. Due to the conditions at the time, there was no engine room automation and automatic navigation, but in terms of its comprehensive repair operations, it was still an advanced level of similar international ships.