Drowning Victims from Flooding in Zhengzhou, China

Lots of flooding going on everywhere, and seems like in Zhengzhou people are drowning in subways that are filling up with tons of water.
Unconfirmed info states the government there opened floodgates on purpose to save a reservoir.
Translation of whats being said in video, I don't speak the language so no idea if true: "We can't get in touch with the nearest hospital. We are now at ShaKou subway station. Please send ambulances as soon as possible."

edit: added another video showing bodies inside a subway train