RedactedNarrative: Operator/Owner stated after venting and starting his 21 ft Cobalt boat, he and three passengers began to idle out of the Rock Quarry. Operator stated he and his party were within 100 meters of the mouth of the rock quarry when he heard a loud bang. Operator stated he looked toward the back of the boat, and observed a large amount of smoke, and rear passengers lunging toward the bow of the vessel. Operator stated the smoke intensified and a small flame appeared as Occupants jumped into the water. Operator stated he and his wife threw life jackets to Occupants, then he and his wife grabbed life jackets and followed Occupants into the water. Operator states all 4 swam away from the vessel, which was by now producing a large plume of smoke. Operator stated a pontoon boat ( TN 7844HE) moved in to assist Operator and his party by helping them into the pontoon boat and getting them a safe distance away. Reporting Officer arrived on scene and transferred Occupants to Patrol boat, then to Star Point Boat Ramp in Pisgah Bay, we were met by EMS. Occupants, who were suffering from burns to their backs, transferred themselves to EMS, and were transported to Lourdes Hospital Paducah KY. One person was later shipped to Vanderbilt Medical Center in Nashville, TN where she was treated for 2nd Degree burns to her back and shoulder, and discharged at 1200 Hours June 3rd. 
  Towboat US from Green Turtle Bay is in charge of recovering the burned vessel 6-4-18.
  
  