The Military News Agency has confirmed that Taiwan's first domestically built
submarine conducted its fifth round of dive tests after departing Port of
Kaohsiung earlier this week.

Video of the previous four rounds of shallow-water dive trials show the
Narwhal performing functions such as steering and control, opening vent
valves, diving, raising the periscope and antenna mast, changing depths,
launching decoys and surfacing.

The report says testing of maneuverability, reconnaissance equipment,
emergency functions and combat management systems has also been carried out.

Those and other previously conducted tests has served to comprehensively
verify the submarine's performance and ensure it meets the Navy's operational
requirements and standards.

C-S-B-C has been accumulating fines since missing a November 2025 deadline
due to "testing delays..." but the shipbuilder last month indicated that it
hopes to deliver the submarine to the Navy in June.