Daewoo shipyard wins defense contract to build second 3,600-ton diesel-electric submarine

Lim Chang-won Reporter() | Posted : September 10, 2021, 12:53 | Updated : September 10, 2021, 12:53

[Courtesy of DSME]

SEOUL -- Daewoo Shipbuilding & Marine Engineering has secured a defense contract worth 985.7 billion won ($840 million) to build South Korea's second 3,600-ton diesel-electric submarine installed with lithium-ion batteries that are more power-efficient than lead-acid batteries, take up less space and improve underwater navigation capability and high-speed maneuvering.

Submarines using lead-acid batteries surface regularly to vent poisonous fumes created in the processes of cooling and charging. With the adoption of lithium-ion batteries, South Korea can strengthen submarine performance and secure competitiveness in large-capacity lithium-ion battery technology, setting the turning point for maritime power.

Construction of the first 3,600-ton submarine began on August 13. The 3,600-ton submarine armed with torpedos, guided missiles and sea mines can sail at a maximum speed of 37 kilometers (23 miles) per hour with 50 crew members on board. It is 89 meters long and 9.6 meters wide. The first 3,600-ton submarine is set to be deployed for naval missions in 2027 and the second one a year later.

The rate of localization stands at 80 percent, improving the export competitiveness of homemade submarines, according to the Defense Acquisition Program Administration (DAPA), a state body controlled by the defense ministry. Chun Yong-kyu, a senior DAPA official in charge of submarine development, said in a statement on September 10 that the construction of 3,600-tons submarines would promote South Korea's "outstanding" submarine construction technology.

South Korea has a three-stage project called KSS (Jangbogo) to develop a fleet of submarines. Through the first phase, nine 1,200-ton diesel-electric submarines have been built with technical help from Germany’s Howaldtswerke-Deutsche Werft (HDW). The second phase calls for the construction of six 1,800-ton vessels. Through the third phase, submarines of 3,000 tons or more are to be built.

The first 3,000-ton submarine named "Dosan Ahn Chang-ho" was delivered for naval missions on August 13. It is 83.5 meters long and 9.6 meters wide and can operate underwater for 20 days without surfacing by using an air-independent propulsion system (AIP). The 3,000-ton submarine has a vertical launch pad capable of firing six submarine-launched ballistic missiles (SLBMs) in a cold launch method.

There was no official confirmation, but Yonhap News reported on September 7 that a homemade SLBM has been successfully tested. As a result, South Korea has virtually completed the development of SLBMs, becoming the world's eighth SLBM holder after the United States, Russia, Britain, France, India, China and North Korea, Yonhap said, adding South Korea's SLBM named "Hyunmoo 4-4" was based on a Hyunmoo-2B ballistic missile that can fly over 500 km.
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