UNINTENTIONAL ROOF FALL OUTBY 1-RIGHT HEADING APPROX. 2000' IN THE #6 NEUT ENTRY AT BREAK 18 IN THE INTERSECTION 130' INBY SPAD 6376. TYPE SUPPORTS 5' TENSIONED REBAR. FELL AT ANCHORAGE POINT. STRESS IN THIS AREA FROM UNDERMINING. FALL AREA HAD BEEN DANGERED OFF AND BREAKER POST SET.