UNIT 1 WAS PULLING A TUBER ON THE ICW HEADING NORTH AS UNIT 1 APPROACHED A DOCK THE TUBE CAUGHT A WAKE AND DRIFTED TOWARDS THE DOCK. THE TUBER ATTEMPTED TO FALL OFF BEFORE IMPACT BUT STILL STRUCK THE DOCK FEET FIRST. TUBER WAS TRANSPORTED TO GRAND STRAND HOSPITAL FOR ANKLE AND LEG INJURY.