China Has Built the World’s Largest-Diameter Underwater Shield Tunnel in a Record-Breaking 110 Days In a stunning display of engineering speed and precision, China has completed the world’s largest-diameter underwater shield tunnel in just 110 days—a timeline that has shocked the global infrastructure community. The project showcases China’s mastery of advanced tunnel boring machines (TBMs), automation, and large-scale project coordination under extreme underwater pressure. Shield tunnels of thi

China has delivered another striking demonstration of rapid infrastructure capability by completing the world’s widest underwater roadway in only 110 days. Built beneath an active water body, the project represents an extraordinary blend of speed, scale, and engineering precision—showcasing how modern construction methods can overcome some of the most complex environments on Earth. The roadway was constructed using immersed-tube tunnel engineering, a technique where massive prefabricated tunnel