@china360_: China's self-developed "Linghang," the world's largest diameter high-speed rail shield tunneling machine, successfully crossed the Yangtze River on Thursday morning, completing the underwater section of the Chongtai Yangtze River Tunnel. Once operational, the project will connect Chongming Island, the country's third-largest island, to the national high-speed rail network for the first time. #latestnews#tunneling#highspeedrail#yangtzeriver#chinainfrastructure#underwatertunnel