RedactedNarrative: UNIT 1 WAS TRAVELING NORTH TOWARD I95 BRIDGE ON LAKE MARION.  WHILE TRAVELING NORTH, A THUNDERSTORM MOVED IN CAUSING VERY ROUGH CONDITIONS.  UNIT 1 BEGAN TAKING WAVES OVER THE FRONT OF THE ENCLOSED CABIN PONTOON WHILE TRYING TO NAVIGATE TO SAFETY.  THE COMBINATION OF THE HIGH WINDS AND APPROXIMATELY 4-5 FOOT WAVES CAUSED UNIT 1 TO SWAMP AND CAPSIZE.  FIVE OF THE OCCUPANTS WERE ABLE TO REACH THE SURFACE WHILE THE SIXTH BEACAME ENTRAPPED IN THE CABIN.  THE VICTIM WAS EVENTUALLY LOCATED AND LOADED ONTO AN SCDNR VESSEL AND TAKEN TO A LANDING.