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| Republic of Korea Navy submarine force | |
|---|---|
| Unit name | Republic of Korea Navy submarine force |
| Native name | 대한민국 해군 잠수함 전력 |
| Caption | ROKS Lee Sunsin (SS 068) underway |
| Country | South Korea |
| Branch | Republic of Korea Navy |
| Type | Naval Submarine |
| Role | Undersea warfare, strategic deterrence, intelligence, special operations support |
| Command structure | Republic of Korea Navy |
| Garrison | Jinhae Naval Base, Gunsan Naval Base |
| Start date | 1953 |
| Notable commanders | Shin Hyun-seong, Kim Myung-sik |
Republic of Korea Navy submarine force is the undersea warfare component of the Republic of Korea Navy responsible for submarine operations, deterrence, intelligence collection, and support to Republic of Korea Armed Forces joint missions. Established in the decades following the Korean War, the force has evolved from small diesel-electric boats to advanced AIP-equipped platforms and domestically produced attack and potential ballistic missile submarine programs. It operates within the maritime security environment shaped by North Korea, People's Republic of China, and alliances such as the United States–South Korea alliance.
The submarine force traces origins to post-Korean War rearmament when the Republic of Korea Navy acquired surplus submarines and focused on anti-North Korea maritime threats. During the Cold War (1947–1991), acquisition and training emphasized coastal defense and anti-surface warfare influenced by experiences of the Battle of Yeonpyeong and incidents involving North Korea's navy. The 1990s and 2000s saw technology transfers and procurement from Germany with purchase of Type 209 submarines, followed by indigenization under programs linked to the Defense Acquisition Program Administration (South Korea) and collaboration with firms like Daewoo Shipbuilding & Marine Engineering and Hyundai Heavy Industries. Incidents such as the ROKS Cheonan sinking heightened emphasis on undersea capability, accelerating investments in sonar, weapons, and asymmetric deterrence. In the 2010s and 2020s the force expanded with KSS program phases, reflecting strategic shifts tied to North Korean ballistic missile program developments and regional naval modernization.
Command falls under the Republic of Korea Navy's Fleet Command and submarine-specific administration within the Submarine Flotilla, coordinating with the Joint Chiefs of Staff (South Korea) for strategic missions. Squadrons are organized into numbered submarine squadrons and support groups located at key bases, integrating with Republic of Korea Marine Corps and Republic of Korea Army coastal units for littoral defense. The force maintains liaison with the United States Pacific Fleet and United States Forces Korea for allied exercises and interoperability, and participates in multinational forums such as RIMPAC and Pacific Partnership. Technical oversight involves the Defense Acquisition Program Administration (South Korea) and naval shipbuilding corporations for maintenance cycles and capability upgrades.
Inventory includes imported and indigenous diesel-electric classes. Early platforms comprised older boats from allied transfers, later replaced by Type 209 (submarine) variants procured from Howaldtswerke-Deutsche Werft or built under license. The KSS-I program fielded Jang Bogo-class submarine variants, followed by KSS-II with Chang Bogo-class improvements and KSS-III (Dosan Ahn Changho-class) as the indigenous heavy conventional submarine featuring Air-independent propulsion and increased payload, produced by Daewoo Shipbuilding & Marine Engineering and Hyundai Heavy Industries. Proposed and planned classes include larger displacement boats with potential for submarine-launched cruise missiles and future ballistic missile submarine concepts linked to strategic deterrence debates. Torpedoes, mines, and anti-ship missiles are integrated from suppliers such as Hanwha and foreign suppliers, while electronic warfare suites and sonar systems incorporate technology from LIG Nex1 and international partners.
Primary submarine bases include Jinhae Naval Base in Changwon, Gunsan Naval Base on the Yellow Sea coast, and forward support installations enabling maintenance, training, and dockyard work. Secure piers, submarine pens, and specialized logistic hubs support through-life sustainment in facilities shared with shipbuilding yards like Geoje and maintenance depots administered by the Republic of Korea Navy Logistics Command. Infrastructure expansion has mirrored the KSS programs, adding covert berthing, command and control nodes, and access routes to minimize vulnerability to surveillance from actors such as People's Republic of China and Japan's maritime forces.
Operational roles encompass anti-surface warfare against North Korean navy vessels, intelligence, surveillance and reconnaissance (ISR) missions in contested waters, blockade and interdiction readiness, and special operations support for Republic of Korea Special Warfare Command missions. The submarine force conducts routine patrols in the Yellow Sea and East China Sea regions and participates in allied maneuvers with the United States Navy and regional navies. Notable operations include covert monitoring of North Korean ballistic missile and submarine activities, contributions to multilateral exercises like RIMPAC, and maritime security operations tied to sanctions enforcement and freedom of navigation tasks.
Crew training pathways combine domestic instruction at the Republic of Korea Naval Academy and specialized submarine schools with international exchange programs involving the United States Navy, German Navy, and other partner services. Personnel undergo intensive submarine warfare, navigation, sonar operation, and damage-control training, with career tracks for officers and petty officers reinforced by simulation centers and at-sea qualifications. Recruitment emphasizes technical aptitude for engineering roles linked to battery, AIP, and propulsion systems developed by firms like Korean Electric Power Corporation and nuclear-related agencies for future technological exploration. Medical, psychological, and survival training mirror standards practiced in allied submarine forces.
Modernization projects are driven by the KSS phased roadmap, focusing on increased endurance, AIP integration, enhanced combat systems, and modular payloads for strike capabilities. Development of the KSS-III Batch II/III and discussions around a potential indigenous ballistic missile submarine reflect strategic recalibration in response to North Korea's nuclear and missile advances and the regional naval expansion of China. Collaboration with domestic companies—Hanwha Defense, LIG Nex1, Samsung Heavy Industries—and foreign partners aims to field next-generation sensors, unmanned underwater vehicles, and quieter propulsion. Procurement plans include expanded fleet size, advanced weapons such as submarine-launched cruise missiles, and upgraded C4ISR connectivity to enhance deterrence and alliance interoperability.
Category:Republic of Korea Navy Category:Submarine forces