Okay kiddo, let me explain the 2009 Henan Mine Disaster in a way that you will understand easily.
Do you know what a mine is? It's like a big hole in the ground where people go to dig and find things like coal and gold. Well, in 2009, there was a mine in Henan province in China where a very bad thing happened.
You see, the mine was not very safe and the people who worked there were not given the right equipment to protect them. One day, there was a big explosion in the mine and it trapped 153 miners underground.
Now, imagine being stuck underground without any light, food, or water. These miners were trapped for 10 days before rescuers were able to reach them. Sadly, only 115 of them survived and many of them were badly injured.
This was a very sad event and it made people realize that mines need to be safe for people to work in. The Chinese government has since taken steps to improve mine safety so that a disaster like this never happens again.