At least 25 people died in China, several on the Zhengzhou city subway train, according to a balance released in the wake of floods that generated an extremely serious situation, according to President Xi Jinping.
About 200,000 people were evacuated in Zhengzhou, a city of 10 million people, located 700 km south of Beijing.
Images released on social media showed subway passengers with water up to their necks in a wagon, clinging to the handles.
A passenger told the Weibo network that the first responders opened the roof of his car to take out the passengers, one by one.
Other images show a passenger sitting on the roof of his car half submerged by water in a tunnel.
The army was called in to reinforce relief efforts in the capital of the populous Henan province, which has received the equivalent of a year of rain in three days.
The city recorded a series of rare and violent storms, causing a pool of water in the Zhengzhou subway, city authorities explained in a message on the Weibo social network.
Authorities declared Zhengzhou on a red alert on Tuesday. The emergency services decreed a level 2 alert throughout the country due to the floods.
National CCTV television showed city streets flooded by water, while residents pushed their vehicles into flooded arteries.
According to local authorities, more than 36,000 city residents were affected by the disaster.
The Zhengzhou Meteorological Services announced that it is the highest rainfall since data began to be collected 60 years ago.
President Xi urged mobilization in the face of inclement weather. “They have yielded dams, causing serious injuries, deaths and damages. The situation due to the floods is extremely serious,” he said, according to national television.
The eye is also on the 20-meter gap in the wall of the Yihetan dam, near Luoyang, a city of 7 million people, and which “can break at any moment,” the army warned.
The military had planned to carry out an emergency operation to try to divert the floods and prevent a catastrophe.
Seasonal rains cause floods in China every year. But the threat has grown in recent years, due to the construction of dams or diversions of the riverbed that have often cut the existing connections between the rivers and the adjacent lakes.
Last year, unprecedented flooding in the Southwest damaged roads and led to the evacuation of tens of thousands of residents.