TAIPEI (TVBS News) — Taiwan's first domestically built submarine cleared a critical milestone Friday (Feb. 6), completing its fourth dive test as the shipbuilder races toward June delivery despite accumulating late penalties that could reach up to NT$38 million (around US$1.2 million).
The Hai Kun (海鯤號) departed at approximately 9:20 a.m. under escort from a Ta Wu-class (大武級) rescue ship and the Endeavor Manta (奮進魔鬼魚號), an unmanned surface vessel (USV) developed by CSBC Corporation, Taiwan (台船). Dozens of supporters held red banners at the port, cheering as the vessel emerged amid weather that shifted from drizzle to sunshine to heavy rain.
Military affairs scholar Chi Tung-yun (紀東昀), who observed the test, said calibration time after each dive has shortened significantly since testing began last week — a sign the vessel's systems are performing consistently. The submarine conducts shallow-water tests within 100 meters (approximately 328 feet), following a pattern of morning departures and evening returns to complete multiple test items in single voyages.
The outing marked the Hai Kun's 10th overall sea trial, following six successful surface navigation tests. Chi attributed the smooth progress to the thoroughness of earlier trials and systematic preparation. Tests of underwater communications, periscope-depth ventilation, and sonar functionality have all proceeded well, validating systems critical for combat operations, Chi said.
In a recent interview, CSBC Chairman Chen Cheng-hung (陳政宏) characterized the successful dive tests as a transformation "from zero to one," confirming the pressure hull and watertight seals meet requirements. He acknowledged the project faced two major challenges: Taiwan's lack of submarine design and construction experience, and difficulties sourcing equipment abroad due to geopolitical constraints.
The testing has drawn public attention beyond the port. A fishing boat returning from Penghu waters on Wednesday encountered the Hai Kun during its third dive test between Kaohsiung and Tainan. The ROCS Chang Chiang (昌江軍艦), a Chin Chiang-class (錦江級) patrol ship, directed the fishing vessel to move away from the testing area.
Chi said he expects the June target to remain achievable if testing continues at the current pace. For the supporters who braved Friday's shifting weather, each successful test brings Taiwan's submarine ambitions closer to reality — even as the penalty clock continues to run. ◼ (At time of reporting, US$1 equals approximately NT$31.68)
