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flag China completes world's longest underwater high-speed rail tunnel under Yangtze River.

flag China has completed a record 11.18-kilometer underwater excavation beneath the Yangtze River for the Shanghai-Chongqing-Chengdu high-speed railway. flag The Chongming-Taicang tunnel, part of a 2,000-kilometer project, is the longest and largest high-speed rail underwater tunnel globally. flag The project, backed by a 500 billion yuan investment and included in the 2026–30 Five-Year Plan, is expected to benefit over 20 cities and generate up to 1.5 trillion yuan in economic value.

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