A roof fall occured in the 3 North Panel, #1 Entry starting at the inby pillar line of crosscut #31 and extending 15' inby the pillar line of crosscut #32. The fall measured approximately 70' X 19' X 9'. 5' fully grouted roof bolts and 9' mega bolts were used to support the area. An undetected slip was determined to be the cause of the fall.