THE EMPLOYEE STATED HE WAS WALKING THE RETURN AIRWAY IN 35 LEFT TO BEP 32 AND WAS WALKING A WOODEN BRIDGE AND THE CRIB BLOCKS WAS NOT ATTACHED TOO THE PIPES THEY WERE LAYING ON AND THE WOOD H EADER CAME OFF THE PIPE CAUSING THE EMPLOYEE TO FALL IN THE WATER AND A HOLE TWISTING HIS LEFT KNEE AND STRIKING HIS LEFT SHOULDER.