An unintentional roof fall was discovered at 7:10 AM on the mains section. The fall was in the #1 entry, 1 break inby spad #3765. The fall measured 5'H x 20'W x 18'L. Fall was investigated by MSHA inspector at 7:10 AM 4-6-05, and by State inspector at 8:40 AM 4-6-05. The fall occurred in a 3-way intersection.