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14km underwater rail tunnel to shorten Shanghai-Chengdu travel time by 5.5 hours

Los Angeles Times

|

April 29, 2026

THE world’s largest diameter high-speed rail tunnel boring machine (a shield TBM), independently developed by China and named "Linghang Hao" (Navigator), has successfully completed 11.18 kilometers of tunneling beneath the Yangtze River.

- Zhu Yile

14km underwater rail tunnel to shorten Shanghai-Chengdu travel time by 5.5 hours

Linghang Hao shield TBM

Since setting off from Shanghai’s Chongming Island on April 29, 2024, the machine has been steadily tunneling for 23 months.

So what does this mean?

It’s nothing short of a miracle in underwater high-speed rail construction — after all, a full 14 kilometers of the line runs beneath the river!

Travel time between Shanghai and Chengdu, capital of southwest China’s Sichuan Province, will be cut by 5.5 hours.

Starting from Shanghai, the route will link three major city clusters across a stretch of about 2,000 kilometers.

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