The left line has a length of 878 m (960 yd), while the right one is 885 m (968 yd) long. Eight miniature innovative technologies were applied in the tunnel's construction
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cover tunnel photo by: Matt Brown from London, England / CC BY
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http://www.cityofzhuhai.com/2022-08/10/c_795974.htm
Shishan Tunnel of Huangmao Sea Channel connected
www.cityofzhuhai.com​Both sides of the Shishan Mt Tunnel in the Huangmao Sea Channel project were connected on Aug 8 after 523 days of work, marking a meaningful milestone in the project's construction, which is expected to be completed in 2024.