RedactedNarrative: On July 3, 2020 approximately 1630 hours Operator was towing two juveniles Passenger/Tuber 2  and Passenger/Tuber 3 on a tube near KINGFISHER ISLAND on FLAMING GORGE DAM. Operator was looking back watching the tube while on plane, under full power and was not aware that the vessel was heading towards the canyon rock wall. The passenger sitting in the bow of the boat, Passenger 1, noticed how close they were getting to the wall and warned Operator how close he was getting. Operator turned around and realized he was going to hit the wall head on. He turned the boat hard to the left to avoid hitting the wall head on. The sharp turn left allowed him to avoid a straight on collision; however, it caused the vessel to hit the rocks on the starboard side. The vessel was still under full power and when it hit the rocks it punctured a hole estimated to be 3 feet in the hull of the vessel. With such a big hole under the water line the vessel before it sank. It was estimated that the vessel sank in over 200 feet of water.
  
  Operator received minor scrapes and bruises. Passenger 1 received a broken rib. All individuals denied ambulance transport to the hospital. They drove themselves to Rock Springs Wyoming for medical treatment at Memorial Hospital of Sweetwater County.
  
  End of report.