The "Yongzhou" shield machine comes off the production line and will be used in the world's longest undersea high-speed rail tunnel. The equipment has a total length of 135 meters, a total weight of 4,350 tons, a cutterhead excavation diameter of 14.57 meters, and is equipped with 308 special tools.
It was jointly developed by China Railway 14th Bureau Group and China Railway Construction Heavy Industry Group. The Jintang Undersea Tunnel is a full-line control project, starting from Yinzhou District, Ningbo City in the west, and ending at Zhoushan Island.