AN UNINTENTIONAL ROOF FALL OCCURED ON THE UNIT 3 WORKING SECTION IN THE CROSSCUT BETWEEN #6 & #7 ENTRIES. THE CROSSCUT HAD BEEN HOLED & NOT SUPPORTED ON THE PREVIOUS SHIFT. THE UNIT WAS IDLE A T THE TIME OF THE ROOF FALL. THE UNSUPPORTED AREA FELL PULLING ROOF BOLTS IN THE ENTRY 6 INTERSECTION. THE FALL AREA WILL BE CLEANED UP & SUPPORTED.