RedactedNarrative: On friday, june 27, 2014 at approximately 20:00 hours, two subjects launched a 1975 wellcraft onto douglas lake from the tennessee valley authority free launch in sevier county, tennessee. Operator assumed the helm, and began traveling upstream into jefferson county, tennessee. Operator advised the wellcraft never reached cruising speed and was struggling to maintain forward momentum. Operator placed the vessel into neutral and inspected the engine for problems. No problems were found, and operator began to travel again. Both operator and occupant noticed water rising inside the vessel. Operator changed his course in an attempt to return to the free launch. When operator changed course, the wellcraft became inundated with water. Both occupants affixed personal floatation devices to themselves and abandoned the wellcraft at 20:21 hours. After exiting the vessel, it rolled and settled in a keel up position. 
  
  Another boater, witnessed operator and occupant abandon their vessel and the wellcraft rolling. Good sam went to the wellcraft''s location and placed operator and occupant inside his vessel. Good sam then tied a line from his vessel to the wellcraft. Good sam towed the wellcraft back to the free launch along with operator and occupant. The wellcraft was deposited on the ramp in a keel up position. 
  
  A land based witness located at anchor down rv park in jefferson county, tennessee watched through binoculars while operator and occupant abandoned their vessel. Witness called 911 immediately after the wellcraft rolled. His call was placed at 20:21 hours. 
  
  I arrived on scene at 20:37 while Good sam was towing the wellcraft. I followed Good sam to the free launch. Once there, i interview all three individuals, and called for a wrecker to remove the wellcraft from the ramp. During the removal process, the wellcraft received damage to the helm, motor and transom. I inspected the vessel and found the main plug for the hull was missing which allowed water to enter the vessel.