INJURED WAS CRAWLING, WHILE IN THE PROCESS RAISED HIS HEAD UP SOME AND HIT HIS HEAD ON A ROOF BOLT. ACCIDENT WASN'T REPORTED UNTIL 1-29-03 INJURED WORKED ALL SHIFT 1-27-03 WORKED ALL SHIFT ON 1-28-03, WORKED 2 HOURS ON 1-29-03, CAME OUTSIDEREPORTED ACCIDENT THEN WENT HOME.