RedactedNarrative: The operator and one other person were in the boat.  They had been running rapids in the river.  The operator was turning the boat downstream when both parties heard a thump when the boat lost power. Not sure if the boat hit something under the water prior to losing power. The operator opened the engine compartment at which time there was an explosion. The operator attempted to put the fire out but was not successful.  Both subjects abandoned the boat.  The boat became fully engulfed in fire, it later sank.   Both subjects were wearing life jackets.  As they were floating in the water they were picked up by another boat.  The operator sustained 2nd degree burns.  He was transported to St. Lukes hospital in Mountain Home, Idaho for treatment.  He is receiving further treatment at a burn center.
  
  The cause of the fire has not been determined.