RedactedNarrative: On 7/27/19 at approximately 1045 hours, I, Investigator of the Florida Fish Wildlife Commission, was on duty in Collier County, State of Florida. I was dispatched to a vessel that had exploded in Naples Bay. Multiple injuries were reported, but no serious injuries were observed or treated. I arrived on scene and spoke with Ofc. also of the FWC who was first on scene. Ofc. told me that six people were on a vessel that had recently left a fuel dock. While it was pulling away from the dock, the starboard side inboard engine exploded and caught fire. One of the passengers was launched from the vessel due to the explosion. Three of the other passengers jumped into the water to avoid the fire that had erupted. The captain, and his other passenger were located up on the tower of the vessel and extinguished the fire with the onboard fire extinguisher. A good Samaritan grabbed all of the occupants and brought them ashore.
  
  Victim2 was flown to Lee county Memorial Hospital and then transported to the Tampa General Hospital burn unit for burns on her lower legs. Victim3 was transported to Naples County Hospital for burns to his legs, Victim4 was also transported to the same hospital for burns to his legs. Victim1 later drove himself to the hospital for treatment of his burns as well, after initially refusing medical treatment.
  
  I spoke with Operator1 who explained the events to me and then stated he had recently had work done to the vessel. Operator1 showed Ofc. and I to the vessel were we began an investigation into the cause of the explosion and subsequent fire. At first view, the damage seemed extremely minimal. Upon closer inspection we discovered that the ventilation system for the inboard engines did not appear to be working. A leak from the starboard fuel sending unit was evident which had released gas vapors into the engine compartment. 
  
  