CHANGSHA, March 25-- The six workers trapped in a flooded shale mine in central China have still not been rescued more than 40 hours after the accident occurred Monday night, local authorities said Wednesday.

The flood happened at about 9:40 p.m. Monday in Muxia Village, Sangzhi County, Zhangjiajie City, Hunan Province, according to the city's publicity department. The city government has sent representatives to the mine to oversee the rescue.

Two pumps are extracting water, while rescuers are still trying to clear mud and fix the drainage system. A new pump was set up at the site Wednesday morning to help with relief efforts.