RedactedNarrative: V1 was underway making way from the boatramp, at the listed location, with listed persons on board. Operator of V1 advised that for unknown reasons the engine compartment exploded causing the vessel to catch fire. All persons onboard exited the vessel by jumping into the water and swimming back to shore. 
  
  Miami Dade Fire Rescue Engine 27 Captain responded, extinguished the fire and treated all occupants.