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flag China's massive underwater tunnel project under the Yangtze River, part of a high-speed rail line, reaches midpoint.

flag China has reached a major milestone in building the world's largest underwater rail tunnel beneath the Yangtze River. flag The shield machine, now halfway through its 14.25-kilometer journey, has completed 5,660 meters, part of the Shanghai-Nanjing-Hefei high-speed railway set to open by late 2029. flag The project involves navigating 21 risk zones and uses advanced AI technology to facilitate construction.

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