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Qingdao Conson Development has commenced construction on the second Jiaozhou Bay Subsea tunnel in the city of Qingdao in China.

In 2012, the company started preliminary research and has conducted four pre-feasibility and 15 feasibility studies for the subsea road tunnel, which is claimed to be the world’s longest road tunnel.

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The underwater tunnel will start at Huaihe East Road in West Coast New District and will stretch alongside Liugongdao Road and passing under Jiaozhou Bay before arriving at Qingdao Port.

It will help to connect East Coast connecting Qingdao’s coastal urban areas.

The 15.89km long tunnel will include six two-way lanes that will make it longer than Norway’s 14.3km Ryfylke Tunnel.

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The company said that the earth and stone excavated at the site are set to top eight million cubic meters, which is more than Japan’s Seikan Tunnel (5.2 million cubic meters) and Europe’s Channel Tunnel (4.8 million cubic meters).

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It also said that the design of the subsea tunnel had overcome challenges including tunnel ventilation, disaster prevention, super-high water pressure, passage through large-scale fractures, and large-scale diameter shield docking in the drill-and-blast method.

The second Jiaozhou Bay Subsea tunnel is said to be a part of China’s ongoing construction of large-scale urban infrastructure transportation facilities which will support the country’s economic development.

Qingdao Conson Development chairman Wang Jianhui said: “The second Jiaozhou Bay Subsea tunnel will optimize the city’s urban structure and strengthen the connection between the east and the west, enabling both sides of the strait to flourish and alleviating traffic congestion.

“With a high standard of design, construction quality, and management efficiency, Qingdao Conson Development is excited to contribute to the emergence of Qingdao as an open, modern, dynamic, fashionable, and international city.”

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Qingdao Conson Development starts construction on the world’s longest subsea road tunnel. (Credit: Qingdao Conson Development/PR Newswire.)