Son Won-il-class (Type 214 / KSS-II)

🇬🇷 Greece • 🇵🇹 Portugal • 🇰🇷 South Korea • 🇹🇷 Turkey

The development of this submarine class began following a 1995 announcement by the South Korean Navy regarding the requirement for vessels larger than the preceding Type 209. A formal agreement was established in October 2000 to introduce these diesel-electric platforms, a deal that necessitated a comprehensive transfer of construction technology. Designated as the Son Won-il class, the program was structured into two phases, beginning with an initial order of three units followed by a second batch of six additional vessels.

This class utilizes diesel-electric propulsion augmented by an air-independent propulsion (AIP) system centered on hydrogen fuel cells. The vessel is constructed with an HY-100 pressure hull, though it omits certain classified features found in related designs, such as non-magnetic steel. For detection and navigation, it employs a specialized radar system that combines high-power pulse capabilities with low probability of intercept (LPI) technology, allowing the platform to operate without revealing its electronic signature. Its offensive suite consists of 533 mm torpedo tubes with the integrated capacity to deploy anti-ship guided missiles. Acoustic signatures are managed through a low-noise skew back propeller design.

The Republic of Korea Navy maintains these submarines for long-endurance maritime operations, with the first units entering active service in 2007. The fleet is utilized for both standard surface patrols and specialized secret missions where electronic invisibility is prioritized. While the majority of the class serves as standard attack platforms, specific units have been configured as specialized guided missile submarines. These vessels have demonstrated operational reach through international deployments, including engagements at strategic locations such as Naval Base Guam. Despite early unconfirmed reports regarding acoustic defects in the lead ship, the class remains a central component of the regional underwater deterrent.