EMPLOYEE WAS INSPECTING HIS ROOF BOLTING MACHINE TRAILING CABLE. AS HE WAS WALKING ALONG THE CABLE HE STEPPED IN A HOLE IN THE MINE FLOOR AND TWISTED HIS RIGHT KNEE. THERE WAS NO DAMAGE TO THE MINING MACHINE OR TO THE OPERATION. EMPLOYEE SHOULD BE MORE AWARE OF THE TRAVELWAY CONDITIONS. NO OTHER FACTORS WERE INVOLVED.