Chunghaejin [Cheong-Hae-Jin] ASR
The first Korean submarine rescue ship "Chonghaejin", which was built for submarine rescue operation in 1996, has all the state-of-the-art systems such as sophisticated deep-water submerging system including deep submersible rescue vehicle and salvage equipment for submarine, and heliport for emergency transportation.
The Cheong Hae Jin class ship was ordered in 1992 and laid down 1994. A multi purpose salvage and rescue ship which carriers a 300m ROV as well as two LCVPs on davits, plus a diving bell for mine men and a decompression chamber. Two large hydraulic cranes fore and aft and one towing winch. There are also two salvage ships which belong to the coast guard.
The length of this ship is 102.1 meters overall, beam 16.4 meters, height 31.6 meters, draft 4.6 meters, displacement 4,349 Tons, maximum speed 18Kts, cruise speed 15Kts and could navigate maximum 9500NM long and maintain the operation for 60 days long by itself without replenishment. For search and transfer of personnel at salvage locations, the ship has the capacity for one helicopter with aft helo deck.
The DSRV (Deep Submergence Rescue Vehicle) is for Rescue of crews from distressed submarines. The length 9.6M, weight 21.4Tons, The small vehicle DSRV is controlled by two pilots and could rescue maximum 10 people at one diving. The maximum operation depth of the DSRV is 457m.
The DDS (Deep Diving System) is composed of five parts as DDC(Deck Decompression Chamber) for making the same environment to the divers as the work depth, DDC control room, Gas room for providing the mixed gas to the divers for breathing, PTC (Personnel Transfer Capsule) for transferring the divers safely to the work depth and PTC control room.
DDC is composed by 2 chambers, the 0-Man Chamber and 0-Man Chamber. It could make the same environment as 300M, the maximum operation depth, for 9 divers at one time. The maximum operation time for the DDC is 28 days. PTC could transfer 3 divers at one time to the maximum operation depth of 300M safely, and provides the diver breathing gas, hot water, electricity and information provided from the mothership.
For maintaining the ship's position automatically at the Salvage operation, three kinds of reference signals will be used. The Auto-positioning control system receives three signals, the position signals from satellite, hydro-acoustics signal from under water installed transponder and the variation signal from taut-wire which descends to the seabed and transmit three signals to the main screw and side thruster to keep the ship's position automatically.
The major achievements of Cheong-Hae-Jin successful operation of DSRV submerging to the maximum depth 457m in 1996, and saturation diving to the maximum depth 300m in 1997, The ship succeeded refloating the Yugo-class submarine that sunk underwater in the east coast of Korea near Kang-nung in 1998. Additionally, semi-submergible boat the sunk underwater in the south coast of Korea to a at 157m depth in vicinity of Yokji-island in 1999 was refloated.
This vessel successfully salvaged the North Korean semi-submarine in three months after it went down 150m under the sea, 100 km south of Geoje Island in March 1999, and is also actively operating in other underwater rescue operations.
About 1,200 years ago, Yeosu was a strategic point of the triangular maritime trade among Korea, China and Japan, and even with Islamic countries in the Middle East. The maritime kingdom of Chonghaejin Fort governed by Admiral Changbogo was the center of this trade. Chonghaejin is a historic spot that was founded by General Chang Po-ko of the Unified Shilla Era. General Chang Po-ko established Cheonghaejin on Chang-do Island and secured the command of the three seas by mopping up the pirates, with the result that Shilla took the leadership in maritime trade among Silla, Japan and the Dang Dynasty.
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