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Construction of China's longest undersea subway tunnel completed
Dalian No. 5 subway line 24.484 kilometers long, 18 stations. 1310 m under sea. Completed.
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://news.cgtn.com/news/2021-01-18/Construction-of-China-s-longest-undersea-subway-tunnel-completed-X92qw5Qtna/index.html
Construction of China's longest undersea subway tunnel completed
news.cgtn.com