RedactedNarrative: Operator was operating a nine foot pwc with two passengers in six pound creek on lake gaston. Operator was heading north at idle speed when the pwc back fired then exploded sending all three passengers airborne and into the water. The pwc then caught on fire and drifted into a boat house catching the boat house on fire also. The passengers were wearing their pfds and were able to swim to shore. The fire department was able to put out the fire. The pwc was burned completely to the water line and sank. The explosion caused the top hull to separate from the bottom hull. The pwc was recovered and removed from the water.