Taiwan‘s New Submarine Launches MK 48 Torpedo for the First Time

Why It Matters

The successful test demonstrates Taiwan’s growing undersea strike capability and deepens U.S. defense ties, reshaping the strategic calculus in the Taiwan Strait. It signals a credible deterrent against regional maritime threats.

Key Takeaways

• Hai Kun fired two Mk48 Mod 6AT torpedoes on May 6
• Test validated combat system's detection, tracking, and firing solution
• US approved sale of 18 Mk48 torpedoes for $180 million
• Submarine delivery postponed to July 2026 due to subsystem delays

Pulse Analysis

Taiwan’s Indigenous Defense Submarine program has reached a pivotal milestone with Hai Kun’s live‑fire of Mk48 Mod 6AT torpedoes. The 533 mm launch tubes and integrated combat system proved capable of acquiring targets, computing firing solutions, and guiding heavyweight torpedoes—capabilities traditionally reserved for advanced blue‑water navies. By successfully recovering the torpedoes using an S‑70C(M) helicopter, the test also highlighted the Navy’s proficiency in post‑launch recovery and data analysis, essential for refining future strike tactics.

The torpedo test underscores the deepening security partnership between Washington and Taipei. In 2020, the U.S. State Department cleared a $180 million foreign‑military sale of 18 Mk48 Mod 6AT torpedoes, a move that bolsters Taiwan’s anti‑ship and anti‑submarine arsenal. Possessing these U.S.‑standard heavyweight torpedoes enhances interoperability with allied forces and raises the cost calculus for any adversary contemplating aggressive actions in the Taiwan Strait. Analysts view the development as a tangible signal of U.S. commitment to maintaining a credible deterrent in the Indo‑Pacific.

Despite the technical success, Hai Kun’s delivery has slipped from the planned December 2025 deadline to July 2026, primarily because key foreign‑made subsystems arrived later than expected. The delay illustrates the challenges of integrating sophisticated Western components into a domestically built platform. Nevertheless, the upcoming commissioning will expand Taiwan’s submarine fleet, providing a stealthy, long‑range strike option that complements its surface fleet and air defenses. As Taiwan continues to invest in indigenous shipbuilding, the Hai Kun milestone sets a benchmark for future vessels and signals a broader shift toward self‑reliant maritime security capabilities.