Taiwan’s Hai Kun Submarine Completes First Submerged Sea Trials

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Taiwan’s Republic of China Navy has begun the first controlled dive tests of the Hai Kun (SS-711), the island’s first indigenously built attack submarine, after months of surface and harbor trials. The submarine departed Kaohsiung harbor on January 26, 2026, entering a new phase of sea trials that validates hull integrity, ballast systems, and submerged safety procedures.

Built by CSBC Corporation, Hai Kun is a diesel-electric submarine designed for operations in the shallow and acoustically complex waters around Taiwan, where silent battery-powered running can complicate adversary anti-submarine warfare (ASW). The milestone pushes Taiwan’s Indigenous Defense Submarine program closer to a planned mid-2026 delivery, after technical delays linked to propulsion issues and sensor-system integration.

🎥 In this Short: why these first dives matter, what Hai Kun can do, and what it changes for the balance of power in the Taiwan Strait.

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