The technical proposal for the Ningbo-Zhoushan Railway, 16.2-kilometer-long undersea tunnel China's first high-speed railway line with an undersea segment, has been completed, the Ningbo Evening News reported on Saturday.

It will build with Tunnel Boring Machine. It will a deep tunnel construction.

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http://www.china.org.cn/business/2020-08/03/content_76340185.htm