What are the omens before the water gushing-out?

On October 20, 2004, a gas explosion accident happened in Daping coalliery in Henan province, causing 148 deaths.

On December 6, 2007, a gas explosion accident happened in a coalliery Hongdong County, Shanxi province, causing 105 miners to die.

Water gushing-out, puking are the most common and frequent accidents in the coal mine. However, certain signs will appear before the accident of water gushing-out and puking. Knowledge about the cause and symptom of a variety of coal mine disaster accidents can minimize injuries furthest.

Before the water gushing-out, there are signs that the coal seams are dark and small beads of water appear on the coal walls and the coal miners feel cooler.

The main reason for the water gushing-out accident is the underground water near the coal mine when exploiting. Coal mines do not exist solely in the ground and there are large amounts of underground water in the vicinity of coal mines. A water gushing-out accident will occur if the coal seam and a great deal of underground water is punched when mining.