DURING THE PRESHIFT EXAMINATION A FALL WAS DISCOVERED INT HE NO. 7 ENTRY OF C-SOUTH AT SURVEY STATION 4850. THE FALL WHICH WAS IN RM INTERSECTION, MEASURED 20'L X 20' W X 8' HIGH. THE FALL IS ABOUT 600' OUTBY THE ACTIVE MDDU-002-0 AND WAS TIMBERED OFF. THERE WAS NO EQUIPMENT INVOLVED. THERE WERE 100 INJURING THE FALL WILL NOT BE CLEANED UP.