A tunnel beneath Micang Mountain, a key part of a highway, is under construction, Oct. 25, 2017. The mountain is located at the border between Sichuan Province and Shaanxi Province. The 13.8-kilometer tunnel has two lanes in each direction, and on its completion in the second half of 2018 will be the second longest road tunnel in China and the third in the world. In building the tunnel, workers have had to overcome great difficulties due to complex geological conditions. (Photo: China News Service/Liu Zhongjun)
