I FOUND THE ROCK FALL WHILE I WAS MAKING MY WEEKLY EXAMINATIONS IN THE RETURN AIRCOURSE. I DON'T KNOW WHEN IT FELL. IT WAS WITHIN A 7 DAY PERIOD. THE FALL WAS A CONTINUING OF ANOTHER ROCK FALL . IT WAS BOLTED WITH 4' CONVENTIONAL BOLTS. IT FELL ABOUT 10' THICK, FOR 120' LONG.