INJURED WAS IN HEAT DRYER CYCLONE CLEANING BOTTOM SO ANOTHER EE COULD WELD. HE HAD ON LANYARD. SAID HE WAS GOING TO MOVE AND UNHOOKED AND HANDED IT TO OTHER EE. LANYARD SLIPPED FROM EE'S HANDS AND INJURED FELL INTO CYCLONE TO THE BOTTOM LANDING HEAD FIRST. OTHER EE CALLED FOR HELP & WAS LOWERED INTO CYCLONE BY CRANE, TIED INJURED TO HIMSELF & WAS LIFTED OUT. INJURED SENT TO HOSPITA