RedactedNarrative: I Officer of the Florida Fish and Wildlife was dispatched to the scene of a boating accident at approximately 1924hrs, the caller advised the engine blew up and vessel sank in the canal that runs west along SR-520 approximately 300 yards west from the St. Johns river. I arrived on scene at 1956 and met with the vessel operator and owner. Operator stated the vessel was having engine trouble, he was attempting to fix it in the water, and when he started the engine the throttle stuck causing the boat to roll over in the water. The operator was the only individual on the vessel at the time of the incident. Vessel was observed upside down the water submerged.