Under snowy mountains
A drone image shows the construction site of the Qilian Mountains No 2 Tunnel at a valley more than 3,500 meters above sea level in Qinghai province. Dug by China Railway 16th Bureau Group Corp, the tunnel posed a major challenge in the construction of National Highway 569, which will link Qinghai with the Inner Mongolia autonomous region. [PHOTO/CHINA DAILY]
康巴卫视微信公众号
