Tianshan Shengli tunnel under construction in Xinjiang

Machinery lay concrete at the construction site of Tianshan Shengli tunnel in northwest China's Xinjiang Uygur Autonomous Region, May 19, 2020. Tianshan Shengli tunnel, a six-year project on the Urumqi-Yuli highway, passes through a cold and high altitude zone, with harsh climate and geological condition. (Xinhua/Hu Huhu)