THE ELECTRICIAN HAD BROUGHT THE ROOM THROUGH THE INTERSECTION ABOUT 10 MINUTES BEFORE THE ROOF GAVE WAY. HE NOTICED THE ROOF LOOKED LIKE IT SAGED. THE ROCK STARTED BREAKING OUT BETWEEN THE BOL TS THEN ALL OF IT CAME IN. THE FALL WAS APPROX 16 FEET WIDE, 25 FEET LONG AND ABOUT 7 FEET HIGH. SUPPORTED W/ 6 FOOT TENSION REBAR. FALL OCCURED2 WEST SECTION, NO. 7 ENTRY, 2 BLOCKS INBY 4025