Chinese netizens photographed a small submarine sailing along the coast of Boundary Island in Hainan Province between 12:46 p.m. and 1:15 p.m. UTC on December 29, 2025, according to a post on X by @new27brigade. The post thanked netizens for providing the image, which shows people behind the submarine, and stated it cannot be ruled out that it is a special warfare submarine. This sighting comes amid China's ongoing Justice Mission 2025 military drills encircling Taiwan, during which Taiwan's military established a response center, deployed forces, and conducted rapid response exercises over the past hour, as reported by Osint613 citing official statements. Earlier today, the drills led to flight diversions impacting over 100,000 international and 6,000 domestic passengers, according to Taiwan's Ministry of Transportation via AJENews, while Taiwan's Navy deployed HF-3 anti-ship missiles to the Hengchun Peninsula per Liberty Times via TaiwansDefense.
