RedactedNarrative: VESSEL 1 ATTEMPTED TO ASSIST ANOTHER BOAT (VESSEL A), WHICH HAD DRIFTED ONTO A SUBMERGED LOG IN THE CURRENT RIVER AND BECAME STUCK.  OPERATOR 1 MADE A QUICK DECISION TO RENDER ASSISTANCE TO THE OTHER PASSENGERS IN VESSEL A. 
  
   OPERATOR 1 ATTACHED A ROPE TO VESSEL A AND THEN SECURED IT TO THE REAR STERN CLEAT ON VESSEL 1.  WHILE OPERATOR 1 WAS REMOVING VESSEL A AND ITS PASSENGERS FROM THE SUBMERGED LOG, VESSEL 1 SUCKED ROCKS INTO THE JET INPUT UNIT.  OPERATOR 1 SAID THE ROPE BECAME TIGHT BETWEEN V1 AND THE TOWED UNIT CAUSING WATER TO COME OVER THE REAR TRANSOM AND FILLED THE ENGINE COMPARTMENT IN VESSEL 1.  VESSEL 1 EVENTUALLY SANK.