RedactedNarrative: UNIT 1 AND UNIT 2 WERE TRAVELING NORTH ON THE WACCAMAW RIVER IN A NARROW CHANNEL.  UNIT 1 WAS TO THE RIGHT AND SLIGHTLY AHEAD OF UNIT 2.  UNIT 1 STRUCK A SUBMERGED TREE AND MADE A SHARP, SUDDEN TURN TO THE LEFT.  
  
  UNIT 1 STRUCK UNIT 2 IN THE OUTBOARD CAUSING UNIT 1 TO CAPSIZE.  THE OCCUPANTS OF UNIT 1 SWAM TO A BRANCH.  THE OPERATOR OF UNIT 2 SUFFERED INJURED RIBS.