AN UNINTENTIONAL FALL OCCURRED IN THE 4-WAY INTERSECTION OF ENTRY #5 OF THE 002-0 MMU AT 3+80. THE FALL WAS 50' LONG, 18' WIDE, 5' THICK. DID NOT IMPAIR VENTILATION OR IMPEDE TRAVEL. ROOF SU PPORTED BY 6 DOUBLE LOCKING BOLTS INSTALLED WITHOUR CURRENT APPROVED PLAN.