An unplanned roof fall occurred at approx 1:00am on the #1 section in the #5 entry which is approx 400' inby spad #2437. The fall measured 20' long, 20' wide and 9' tall. No equipment was involved. Ventilation was not affected. No injuries were reported. Passage of persons was affected. All entrances to fall have been breakered off and fall will not be rehabilitated.