People carrying children and supplies wade through floodwaters following heavy rainfall in Zhengzhou, Henan province, China July 23, 2021. Tens of thousands of people were being evacuated from flood-hit regions of central China on Thursday as officials raised the death toll from heavy rain that has deluged Henan province for almost a week to at least 33 people. REUTERS/Aly Song

People with a makeshift raft filled with food supplies wade through floodwaters following heavy rainfall in Zhengzhou, Henan province, China July 23, 2021. Dozens have died in the province over the last few days, a number of them in a flooded subway, where the waters reached shoulder level. REUTERS/Aly Song

Men stand on a vehicle on a flooded road following heavy rainfall in Zhengzhou, Henan province, China July 23, 2021. And the People's Liberation Army has sent more than 5 and a half thousand soldiers and personnel to help with search and rescue. REUTERS/Aly Song

Soldiers of Chinese People's Liberation Army (PLA) evacuate children stranded by floodwaters with basins in Weihui of Xinxiang, Henan province, China July 22, 2021. cnsphoto via REUTERS

People push a vehicle through floodwaters following heavy rainfall in Zhengzhou, Henan province, China July 23, 2021. Picture taken with a drone. REUTERS/Aly Song

An aerial view shows a flooded road following heavy rainfall in Zhengzhou, Henan province, China July 23, 2021. Picture taken with a drone. REUTERS/Aly Song