Taiwan's first domestically built submarine is moving through sea trials faster than expected, a positive sign for the island's defense program.

• The Hai Kun went out for its 22nd sea trial and 16th dive test, its second outing this week.
• Crews are handling the boat and the trial routine more smoothly each time, and test items are steadily being ticked off.
• Delivery to the navy in October now looks more likely, according to defense analyst Chi Tung-yun.
• Supporters gathered at the Kaohsiung dockside waving flags and cheering the boat on.
• The navy and shipbuilder are still putting safety ahead of speed, which has slowed the pace of testing.

Outlook: If trials keep going this well, the submarine could be handed to the navy in October, with lessons carried into the next boats in the fleet.