An unintentional roof fall was discovered during an inspection of the return air course. The fall was discovered in the South West Mains 1 Section, 2 breaks inby spad 1560 in the No. 2 entry. The fall was in the intersection of the No.2 entry, through the x-cut & into the No.3 entry intersection. The fall measured 188 ft long, 18 ft wide & 5 to 7 ft thick. Area developed 4/24/08.