RedactedNarrative: Operator attempted to launch his PWC from the public launch site. He removed the PWC from the trailer and was sitting on the PWC next to the dock. He had one passenger. The PWC had a full tank of gas. The Operator attempted to turn his engine on. At that point, an unintended ignition caused an explosion that tore the PWC in half horizontally and launched both occupants from the PWC. The Operator was transported to the hospital by ambulance. The passenger was apparently uninjured. Life jackets were being worn by both occupants. Alcohol was not a factor.