RedactedNarrative: Vessel was being operated on plane West on Long Island Sound when the operator heard a loud explosion coming from the engine compartment. 
  
  The operator throttled back the engine and checked the engine compartment. Operator observed flames coming from the engine compartment. The operator attempted to use 5 or 6 fire extinguishers to extinguish the flames. 
  
  The operator was unable to extinguish the flames and immediately called USCG on VHF Channel 16. The fire overcame the vessel and the operator  jumped in to the water. The operator was rescued by a fire vessel and the vessel submerged and sank in approximately 55 ft of water. The vessel was left submerged on the sea floor. No injuries. Vessel total loss.