EE WAS USING A JACK HAMMER ONT UNNEL FLOOR AND SHOVELING DEBRIS INTO BUCKET. HE WAS THEN DUMPING THE BUCKET OF DEBRIS ONTO THE TUNNEL BELT. AS HE WAS DUMPING THE BUCKET OF DEBRIS HE FELT A POP BETWEEN HIS SHOULDER BLADES. HIS NECK AND RIGHT ARM THEN BECAME PAINFUL TO MOVE.