VESSEL 1 WAS PULLING A TUBE WITH 2 PASSENGERS ONBOARD. THE TUBE WAS TURNING TO CROSS A WAKE OF VESSEL 2. VESSEL 2 HAD COME FROM THE LANDING AND HAD DISENGAGED THE THROTTLE AND WAS DRIFTING NEAR WITNESS VESSEL 3 (A pwc) AND TALKING TO THE OPERATOR OF VESSEL 3. THE OPERATOR OF VESSEL 1 WAS LOOKING BACK AT THE PASSENGERS ON THE TUBE ABD WHEN HE TURNED AROUND HE SAW VESSEL 2 HAD STOPPED AND WAS DRIFTING AND VESSEL 1 COLLIDED WITH VESSEL 2 ON THE STARBOARD SIDE JUST FORWARD OF THE MIDDLE OF THE VESSEL CAUSING EXTENSIVE DAMAGE TO THE STARBOARD SIDE OF VESSEL 2 AND TO THE PORT BOW OF VESSEL 1. THERE WERE NO INJURIES TO ANYONE ON EITHER VESSEL.