AN UNINTENTIONAL ROOF FALL MEASURING 100'L X 19'W X 8' TO 11'THICK OCCURRED IN THE NO 4 ENTRY OF THE 002 MMU. THE FALL OCCURRED DUE TO EXCESSIVE PRESSURE ABOVE THE INSTALLED 5' COMBINATION ROO F BOLTS. ENTRANCES TO THE FALL WAS RE-SUPPORTED WITH ADDITIONAL SUPPORTS (CRIBS). THE FALL WAS RE-SUPPORTED WITH 5' COMBINATION ROOF BOLTS AND 10' ROPE BOLTS.