UNIT 1 WAS TRAVELING TOWARDS CHALESTON HARBOR OUT OF THE WAPPOO CUT AT APPROXINATELY 2100 AT FULL SPEED WITH NO NAVIGATIONAL LIGHTS ON. THE BOAT STRUCK DOCK AT 9 ALBMARLE RD. OPERATOR and occupant WERE THROWN FROM THE BOAT. THE BOAT THEN CROSSED BACK OVER WAPPOO CUT STOPPING 50 YARD IN THE MARSH JUST NORTH OF THE CHARLESTON COUNTRY CLUB GOLF COURSE. the operator and occuapnt MANAGED TO GET OUT OF THE WATER BY CLIMBING UP ON DOCKS. operator WAS TRANSPORTED TO MUSC FOR HEAD AND BACK INJURIES.