Rescuers are on standby at the entrance to the flooded coal mine at Ji'anda Coal Mining Co., Ltd. in Hongtong County, north China's Shanxi Province, Aug. 3, 2012. Four out of 12 miners trapped in a flooded coal mine in Shanxi Province have been saved and the other eight were confirmed dead. The coal mine, which belongs to Ji'anda Coal Mining Co., Ltd. of the Shanxi Luhe Coal-Chemical Group, flooded around 4:17 a.m. Wednesday and trapped 12 miners. (Xinhua/Yan Yan)

A rescuer is on standby at the entrance to the flooded coal mine at Ji'anda Coal Mining Co., Ltd. in Hongtong County, north China's Shanxi Province, Aug. 3, 2012. Four out of 12 miners trapped in a flooded coal mine in Shanxi Province have been saved and the other eight were confirmed dead. The coal mine, which belongs to Ji'anda Coal Mining Co., Ltd. of the Shanxi Luhe Coal-Chemical Group, flooded around 4:17 a.m. Wednesday and trapped 12 miners. (Xinhua/Yan Yan)

Rescuers walk out from the flooded coal mine at Ji'anda Coal Mining Co., Ltd. in Hongtong County, north China's Shanxi Province, Aug. 3, 2012. Four out of 12 miners trapped in a flooded coal mine in Shanxi Province have been saved and the other eight were confirmed dead. The coal mine, which belongs to Ji'anda Coal Mining Co., Ltd. of the Shanxi Luhe Coal-Chemical Group, flooded around 4:17 a.m. Wednesday and trapped 12 miners. (Xinhua/Yan Yan)

Rescuers search for missing miners in the flooded coal mine at Ji'anda Coal Mining Co., Ltd. in Hongtong County, north China's Shanxi Province, Aug. 3, 2012. Four out of 12 miners trapped in a flooded coal mine in Shanxi Province have been saved and the other eight were confirmed dead. The coal mine, which belongs to Ji'anda Coal Mining Co., Ltd. of the Shanxi Luhe Coal-Chemical Group, flooded around 4:17 a.m. Wednesday and trapped 12 miners. (Xinhua/Yan Yan)

Rescuers search for missing miners in the flooded coal mine at Ji'anda Coal Mining Co., Ltd. in Hongtong County, north China's Shanxi Province, Aug. 3, 2012. Four out of 12 miners trapped in a flooded coal mine in Shanxi Province have been saved and the other eight were confirmed dead. The coal mine, which belongs to Ji'anda Coal Mining Co., Ltd. of the Shanxi Luhe Coal-Chemical Group, flooded around 4:17 a.m. Wednesday and trapped 12 miners. (Xinhua/Yan Yan)