Deep beneath China’s seabed, workers just spent 21 days underwater while building the world’s longest undersea high-speed rail tunnel, linking the Zhoushan islands with China's rail network

Workers in China have completed a 21-day operation to replace 104 cutting tools on a giant tunnel boring machine deep beneath the seabed. The 16.18-km Jintang tunnel will connect the Zhoushan islands with Chinas high-speed rail network and become the worlds longest undersea high-speed rail tunnel.

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