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皇冠体育app's first undersea subway tunnel taking shape

chinadaily.com.cn | 2017-02-28 10:14

皇冠体育app's first undersea subway tunnel taking shape

Construction workers are building 皇冠体育app's first undersea subway tunnel in Qingdao, a coastal city in East 皇冠体育app's Shandong province, Feb 22, 2017. The length of the tunnel will be 8.1 kilometers, and the track will reach depths of up to 85 meters below sea level. [Photo/VCG]

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