RedactedNarrative: Vessel 2 was towing vessel 1 on the Ouachita River. Vessel 1 was not under power. Vessel 1 exploded, which caused the occupant of vessel 1 to be launched into the air. The operator of vessel 1 advised that he was trying to start the vessel while being towed. PFDs were being worn by both operators on Vessel 1 and Vessel 2. The use of alcohol and drugs were not factors contributing to the incident.