RedactedNarrative: On september 15, 2018 at approximately 0926 hours, operator was operating his 1987 mastercraft pro star 190 in the agua fria river channel of lake pleasant. He heard a loud sound in the rear of the boat and observed a large amount of water entering the vessel. The vessel began to sink and became flooded. Operator placed the boat on the shoreline and called tow boat usa. operator has insurance on the vessel. 
  
  They believe some kind of bearing in the seal broke loose and caused the damage to the boat. There were sufficient life jackets on board and a fire extinguisher on board.
   Subsequent interview of vessel owner indicated the exhaust tubes had become dislodged from the transom due to engine heating and allowed water to flood through hull openings.