China finishes tunneling for longest underwater highway

China has successfully completed drilling operations using tunneling shield technology for the country's longest underwater highway tunnel, the Jiaozhou Bay Tunnel in Qingdao, Shandong Province, measuring 17.48 kilometers. It reached a depth of 105 meters beneath the sea surface, connecting Qingdao's urban area with the new western coastal zone. The tunnel features two main tubes with three lanes in each direction, designed for speeds of up to 80 km/h. This project is a major engineering achievement aimed at improving the transportation network in the region and facilitating mobility between key areas, as part of the national development plan for an integrated transportation system by 2030.

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