China is building new high-speed rail lines that dive underneath major waterways, providing fast services without disrupting shipping traffic
2-MIN READ2-MIN ListenRalph JenningsPublished: 10:00am, 1 Apr 2026China has finished digging the underwater section of a high-speed rail tunnel stretching more than 14km (9 miles) under a busy segment of the Yangtze River, as the country increasingly turns to vast subterranean passages to expand its railway network.
The tunnel beneath China’s longest waterway, which will link Shanghai’s Chongming Island with Taicang city in neighbouring Jiangsu province, is on track to be completed by the end of the year, state broadcaster CCTV reported.
The project will allow trains to hurtle through the tunnel at 350km/h (217mph), enabling faster connections between cities on China’s populous eastern coastline and Hefei, the capital of nearby Anhui province, according to state media reports.
A tunnel boring machine emerged from the Yangtze shoreline on Sunday, after spending nearly two years punching a passageway with a 15-metre (49-foot) diameter under the river, according to People’s Daily. The tunnel is the longest of its kind ever constructed in China, it added.
