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Tunnel workers at construction site of water supply project in Shaanxi
A worker maintains a tunnel boring machine in a tunnel below ground of the Qinling Mountains in Northwest China's Shaanxi province, Feb 4, 2021
http://english.www.gov.cn/news/photos/202102/06/content_WS601e4567c6d0f725769453b8.html
cover tunnel photo by: Matt Brown from London, England / CC BY
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http://english.www.gov.cn/news/photos/202102/06/content_WS601e4567c6d0f725769453b8.html
Workers at construction site of water supply project in Shaanxi
english.www.gov.cn