Abstract: EMPLOYEES #1 AND #2 HAD BEEN INSTRUCTED BY THEIR SUPERVISOR TO ENTER A STORAGE TANK THROUGH THE TOP HATCH TO CLEAN PLUGGED GRATING IN THE TANK BOTTOM. THEY WERE STANDING ON TOP OF A SWEEP AND USING A TEN FOOT LONG LENGTH OF CONDUIT TO PROD CORN THROUGH A GRATING, WHICH HAD A PICKUP BELOW IT. THE 30 FOOT DIAMETER BIN WAS 32 FEET HIGH AND HAD A 33,000 BUSHEL CAPACITY. THE BIN WAS HALF FULL OF CORN, WHICH WAS CLINGING TO THE SIDES OF THE BIN. THE CORN CAVED IN ON THE EMPLOYEES, BURYING EMPLOYEE #1 UP TO HIS MOUTH AND EMPLOYEE #2 UP TO HIS WAIST. THE COMPANY HAS A WRITTEN BIN ENTRY PROCEDURE, REQUIRING A WRITTEN COMMENT. NEITHER MAN HAD ANY SAFETY EQUIPMENT OR HAD AN ENTRY PERMIT.