RedactedNarrative: VESSEL 1 WAS TOWING A TUBE AT IDLE SPEED COMING OUT OF A COVE.  VESSEL 1 POWERED UP WHILE THE TUBE WAS PORT SIDE OF THE VESSEL CAUSING THE TUBE TO SWING STARBOARD.  ONCE THE VESSEL REACHED PLANING SPEED, THE TUBE WAS IN THE AIR WHILE STILL SWINGING STARBOARD CAUSING THE VICTIMS AND TUBE TO STRIKE THE TREES ON THE SHORELINE.