Emergency crews in China are still trying to rescue 42 workers trapped after heavy rains flooded two mines and caused a roof to collapse.

More than 80 rescuers in Guangxi Province are digging through the flood tunnels. Three dead bodies have already been pulled from the scene.

A preliminary investigation found that one mine's drainage system broke down during a heavy rainfall. Twenty-one miners and two other people are believe to be trapped there.

Nearby, 19 workers are also trapped after a gas explosion caved in part of their mine about 1,200 feet underground.

The two disasters happened within hours of each other, July 2.

As crews searched for the missing miners Thursday, a coal mine fire trapped 28 workers underground in eastern China.

The ongoing accidents in different regions highlight the continuing risks of China's mining industry,

Despite safety campaigns, heavy demand for coal to fuel China's economy has made Chinese mines among the world's deadliest.