AN UNINTENTIONAL ROOF FALL OCCURRED IN THE STRAIGHT OF ENTRY #2, ON THE 002-0 MMU @ 1+30. THE FALL WAS 30' LONG, 12' WIDE, AND 6' HIGH. DID NOT IMPAIR VENTILATION OR IMPEDE TRAVEL. THE AREA WA S DEVELOPED THE DAY OF THE FALL & SUPPORTED WITH 6' FULLY GROUTED ROOF BOLTS.