RedactedNarrative: Vessel 1 was traveling N into Matlacha Pass when Cpl 1 came upon vessel moving. Opt 1 could see by the was the vessel was sitting in the water that it was taking on water, the vessel was directed to a shallow area, Punta Bianca shoreline where the vessel sunk, Tow Boat US check the hull, stated that there was a hole in the vessel which looked like the vessel had possibly struck something underwater, causing the transom to fail.