A fall of the roof occurred on the 1st NE Mains (1st 54) in the #5 entry, the pillar line fell between crosscuts 26-27. The fall measured approximately 65' in length, by 18'-20' in width, & 7'-14' in height. The fall was in a secondary escapeway entry, the lifeline was re-routed, flagged, mapped, and all persons were notified of the change.