South Korea Launches Second KSS-III Batch-II Submarine, ROKS Seo Hui
The 3,600-ton attack submarine uses a locally developed lithium-ion battery system and is slated for delivery to the Navy in 2028.
- On Tuesday, South Korea launched the ROKS Seo Hui, its second 3,600-ton Jang Bogo-III Batch-II submarine, at Hanwha Ocean's Okpo shipyard on Geoje Island with approximately 200 officials attending.
- The vessel incorporates 70 domestically produced systems, including a lithium-ion battery plant that extends underwater endurance compared to traditional lead-acid batteries. This indigenous approach strengthens South Korea's competitive edge in the global defense export market.
- Named after a Goryeo Dynasty diplomat, the Seo Hui features enhanced sonar, vertical launch systems, and advanced noise-reduction technologies. It measures 89 meters in length and represents a significant upgrade over earlier 3,000-ton Batch-I submarines.
- "The Seo Hui is a cutting-edge national strategic asset," said Rear Adm. Lee Koo-sung, director general for planning and management at Navy Headquarters. Following sea trials, the submarine is scheduled for delivery to the Navy in 2028.
- Lee Sang-woo, head of DAPA's Nuclear-Powered Submarine Project Group, noted the vessel reinforces combat readiness while establishing a foundation for the advanced defense industry. The program aims to maintain strategic response posture around the Korean Peninsula.
15 Articles
15 Articles
The New Giant of the Seas Has Been Launched: Equipped with 10 Missile Launch Boxes - Sözcü Newspaper
South Korea has launched its new generation ROKS Seo Hui submarine as part of its efforts to strengthen its naval forces. The submarine, notable for its advanced weapon systems and technologies that allow it to remain submerged for extended periods, is expected to make a significant contribution to the country's maritime defense capabilities.
Mitsubishi Heavy Industries launched the JS Shogei and Hanwha Ocean unveiled the ROKS Seo Hui, two units that strengthen the fleet and naval industry of each country.
(Seoul = Yonhap News) Reporter Oh Kyu-jin = National Assembly Speaker Cho Jung-sik attended the launching ceremony of the Navy's new 3,600-ton submarine 'Seohui' on the 3rd and said, "The technological capabilities of K-defense are world-class..."
The South Korean Navy announced that it has launched the second KSS-III Batch.2 submarine, the SS-088 “Seo Hui”. The keel of the submarine was laid down in July 2024, and it is expected to enter service in 2028. The first submarine of the type was launched in October 2025 and is expected to enter service in 2026. The third and final […] The article South Korea launches second KSS-III Batch.2 submarine was first published in Defence Review.
Coverage Details
Bias Distribution
- 40% of the sources lean Left, 40% of the sources lean Right
Factuality
To view factuality data please Upgrade to Premium
