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Shanghai's first metro line crossing Yangtze River under construction
02:22

Construction is underway on Shanghai's longest metro train tunnel. The Chongming Line will connect the city's Pudong New Area and Chongming Island, China's third largest island. It's also the first of the city's metro lines to cross the Yangtze River. CGTN went 30 meters underground to examine how the construction is progressing.

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