A rescuer prepares to enter the shaft of the collapsed coal mine in Heshan, southwest China's Guangxi Zhuang Autonomous Region, July 5, 2011. Rescuers are racing to dig through a sludge-flooded tunnel to reach 19 miners who are trapped in the collapsed coal for the fourth day, sources with the rescue command center said Tuesday. The coal mine in Heshan collapsed on July 2 after days of heavy rainfall, killing three people and trapping 19 others. [Photo/Xinhua]