Rescuers transfer a rescue machine to a flooded coal mine in Jincheng, north China's Shanxi Province, July 3, 2016. Rescuers have managed to contact on Sunday night eight of the 12 people trapped in the coal mine after it was flooded on Saturday night. (Xinhua/Zhan Yan)

Rescuers carry rescue equipment to a flooded coal mine in Jincheng, north China's Shanxi Province, July 3, 2016. Rescuers have managed to contact on Sunday night eight of the 12 people trapped in the coal mine after it was flooded on Saturday night. (Xinhua/Zhan Yan)

 Rescue vehicles wait outside a flooded coal mine in Jincheng, north China's Shanxi Province, July 3, 2016. Rescuers have managed to contact on Sunday night eight of the 12 people trapped in the coal mine after it was flooded on Saturday night. (Xinhua/Zhan Yan)

Rescuers carry rescue equipment into a well at a flooded coal mine in Jincheng, north China's Shanxi Province, July 3, 2016. Rescuers have managed to contact on Sunday night eight of the 12 people trapped in the coal mine after it was flooded on Saturday night. (Xinhua/Zhan Yan)

Rescuers carry rescue equipment to a flooded coal mine in Jincheng, north China's Shanxi Province, July 3, 2016. Rescuers have managed to contact on Sunday night eight of the 12 people trapped in the coal mine after it was flooded on Saturday night. (Xinhua/Zhan Yan)

Rescuers prepare rescue equipment for a flooded coal mine in Jincheng, north China's Shanxi Province, July 3, 2016. Rescuers have managed to contact on Sunday night eight of the 12 people trapped in the coal mine after it was flooded on Saturday night. (Xinhua/Zhan Yan)

Rescuers work at a flooded coal mine in Jincheng, north China's Shanxi Province, July 3, 2016. Rescuers have managed to contact on Sunday night eight of the 12 people trapped in the coal mine after it was flooded on Saturday night. (Xinhua/Zhan Yan)

Rescuers carry rescue equipment to a flooded coal mine in Jincheng, north China's Shanxi Province, July 3, 2016. Rescuers have managed to contact on Sunday night eight of the 12 people trapped in the coal mine after it was flooded on Saturday night. (Xinhua/Zhan Yan)