
Photo taken on Jan .19, 2020 shows the construction site of an undersea subway tunnel, part of the Subway Line No. 8 project, in Qingdao, east China's Shandong Province. (Xinhua/Li Ziheng)

Photo taken on Jan .19, 2020 shows the construction site of an undersea subway tunnel, part of the Subway Line No. 8 project, in Qingdao, east China's Shandong Province. (Xinhua/Li Ziheng)