Taiwan Deploys First Indigenous Attack Submarine to Boost Deterrence

Taiwan’s launching of the Hai Kun (SS-711), its first domestically-built attack submarine, marks a strategic escalation in its naval deterrent against regional threats. The vessel enhances Taiwan's defensive capabilities amid intensifying Chinese military pressure and blockade risks. This development reframes Taiwan's maritime strategy with advanced diesel-electric technology crucial for asymmetric warfare.

Taiwanese President Lai Ching-te boarded the Hai Kun (SS-711), the island’s first domestically-built attack submarine, on March 19, underscoring its crucial role in Taiwan’s maritime deterrence strategy. Lai emphasized submarines as pivotal tools in establishing ‘strategic deterrence’ and countering potential Chinese maritime blockades.

The Hai Kun represents a major milestone from Taiwan’s Indigenous Defense Submarine program, delivering a 2,500-ton diesel-electric attack vessel tailored for undersea warfare. This boat signals Taiwan’s intent to cement asymmetric naval capabilities in the face of growing Chinese naval dominance and frequent incursions around the Taiwan Strait.

Strategically, the submarine project deepens Taiwan’s defensive depth and aims to complicate Beijing’s military calculus. Submarines like the Hai Kun offer stealthy, credible second-strike options that challenge Chinese efforts to impose maritime control and blockade the island, a core component of China’s ‘grey zone’ coercion strategy.

Technically, the SS-711 incorporates advanced indigenous design features, including air-independent propulsion systems to extend underwater endurance, modern sonar and combat systems, and launch capability for anti-ship and land-attack weapons. The 2,500-ton displacement places it among the region’s significant diesel-electric classes, enhancing Taiwan’s underwater fleet’s operational flexibility.

Looking forward, the Hai Kun deployment signals intensified maritime rivalry in the Western Pacific. Taiwan’s submarine capability expansion risks escalating tensions and could provoke countermeasures from Beijing. However, it significantly boosts Taipei’s deterrent posture, potentially stabilizing the balance by complicating Chinese naval plans in the Taiwan Strait and surrounding waters.