COMPRESSED AIR WAS BEING USED TO DISLODGE ICE FROM A PIPELINE. AS THE ICE BECAME DISLODGED THE COMPRESSED AIR AND ICE WERE FORCED OUT OF THE END OF THE PIPE. THE COMPRESSED AIR EXPANDED AND TH E FORCE OF THE EXPANDING AIR KNOCKED THE INJURED OVER. INJURIES INCLUDED DISLOCATED SHOULDER, BROKEN CLAVICLE AND MINOR CUT.