5/18/06 an unintentional roof fall occurred on the #4 Unit, MMU-004, #3 intake entry at #29xc. This roof fall was located in the intersection & was supported with 6ft point anchor roof bolts. The fall measured 25'L x 18' W x 7-8' in thickness. The roof fall will not be cleaned up and all approaches have been cribbed off and flagged off.