AN UNINTENTIONAL ROOF FALL WAS DISCOVERED BY THE WEEKLY EXAMINER IN THE NORTH-SUB MAINS, #2 ENTRY, X-CUT 13. THE FALL MEASURED APPROX. 5.5'Hx20'Lx16'W. THIS WAS IN AN AREA THAT WAS BOLTED WITH 5' BOLTS PRIOR TO THE OPERATOR VOLUNTARILY CHANGING TO 6' BOLTS. THE AREA WAS DANGERED OFF TO PREVENT UNAUTHORIZED ENTRY.