RedactedNarrative: Vessel #1 was secured to a boat dock at the residence. There were two occupants aboard the vessel. Both occupants stated that they heard a pump running inside the engine compartment. They began flipping switches in an attempt to shut off whatever was making the noise. One of the occupants opened the engine compartment. At the same time, the other occupant turned the ignition key to the first click. At this point in time, an explosion occurred from the engine compartment. Fire extinguishers were used to stop the fire. Both occupants of vessel #1 suffered significant burns in the explosion, and were transported, by ambulance, to UAB Burn Center in  Birmingham, AL.