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World’s Longest Underwater Road Tunnel Dig Complete

In a significant engineering feat, the tunnel boring for the Qingdao Jiaozhou Bay Second Underwater Road Tunnel has been fully completed.

On October 2nd, at a depth of 105 meters below the sea level of Jiaozhou Bay, the “Guohao” tunnel boring machine reached its final section, installing the last precast segment to mark the end of the tunnel’s shield excavation.

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