Record-breaking heavy rain of more than 200 mm per hour fell in central China.
Twelve passengers were killed when the subway that was in operation was also submerged.
This is Beijing Correspondent Kim Ji-sung.
Water begins to seep into the running subway.
The subway eventually came to a stop, and the constant flow of water eventually reached the height of the passengers' shoulders.
Passengers were frightened and complained of lack of oxygen or called for rescue.
[(Everyone, don't tell me, don't tell me.) If you can hear me, please report it to the police.]
Yesterday (20th) afternoon in Zhengzhou, the capital city of Henan Province in central China, it rained at a rate of 201 mm per hour.
It was the largest amount of rain since meteorological observations, equivalent to a year's worth of rain in three days.
As a result, the subway bulkhead collapsed and the subway was flooded, trapping more than 500 passengers.
Firefighters rushed to the rescue, but 12 people were killed and 5 people were taken to hospital.
Zhengzhou City has suspended all subway lines.
[Subway passenger: I broke the upper part of the window to let air in. Otherwise, I would have suffocated. The water has come up to here.] The
heavy rain created a 20-meter-long gap in a dam near Zhengzhou City.
When the dam was in danger of collapse, military authorities blew up the embankment to reduce water pressure.
Henan Province upgraded its flood response posture to the highest level and evacuated more than 200,000 residents, but heavy rain is predicted to continue until tomorrow.
(Video coverage: Choi Duk-hyun, video editing: Cho Moo-hwan, CG: Jeong Hyeon-jeong, video source: CCTV Weibo)