China to build world’s longest underwater tunnel
The estimated cost is $36 billion, and the length is 123 km (76 miles).
Those are the numbers for what would be the world’s longest underwater tunnel that China plans to build beneath the Bohai Sea by 2026. The plan is expected to be submitted to the State Council in April.
“Once approved, work could begin as early as 2015 or 2016,” Wang Mengshu, a tunnel and railway expert at the Chinese Academy of Engineering who has worked on the plan since 2012, told China Daily. Work on a feasibility report could take two or three years, he said.
The tunnel will house a rail line connecting the port cities of Dalian in Liaoning province and Yantai in Shandong province. It will surpass the combined length of the world’s two longest underwater tunnels — Japan’s Seikan Tunnel and the Channel Tunnel between Britain and France.