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Hong Kong-Zhuhai-Macau Bridge and Undersea Tunnel
Blog / Underground Technology Posted on: 11/03/202118/08/2025

Hong Kong-Zhuhai-Macau Bridge and Undersea Tunnel

The 6.7 km undersea tunnel is a key component of the large-scale Hong Kong-Zhuhai-Macau Bridge […]

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    Interesting Underground

    The world's first subway opened in London in 1863. The trains were steam-powered, and the tunnels were often filled with thick smoke.

    The longest subway system is in Shanghai: more than 800 km of lines and over 500 stations.

    The deepest station is Arsenalna in Kiev (105.5 m). The escalator takes almost 5 minutes to reach the bottom.

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