A worker assembles pipelines inside a tunnel across the Yellow River in Zhongning County, Zhongwei City of northwest China's Ningxia Hui Autonomous Reigon, Feb. 9, 2021. More than 100 workers are still on duty in the tunnel to ensure the project development on time despite the upcoming Spring Festival, or the Chinese Lunar New Year. This tunnel, the second one to cross the Yellow River in Ningxia, is part of a greater project to provide heating service to residents in Zhongning. (Xinhua/Feng Kaihua)
