C497 An Unexpected Danger!

"There's an underground river down there, and because the mine is too deep, the tunnel is getting closer and closer to the river. The river has been corroding the tunnel for many years, causing the loss of water and earth to be serious. It is about to collapse. . . " Ying Shun had not finished his words.

Suddenly, a loud sound came from within the mine.

Countless thick smoke rolled over