Police officer Zeng Renzhong speaks through a walkie talkie in the Longdongbao Railway Station in Guiyang, southwest China's Guizhou Province, Feb. 19, 2019. Zeng and Ye stuck to their posts during the Spring Festival travel rush on the platforms of the Longdongbao Railway Station, which was located 49 meters under the ground. (Xinhua/Ou Dongqu)