RedactedNarrative: Vessel #1 operator stated that he and his wife left the Eagle Point boat slip at approximately 0800 and when they reached the Napier Bridge the vessel engine had developed a hiss. He stated at this point they decided to turn around and return back to their slip.  He stated as they neared the slip his wife was standing, getting ready to grab the dock/piling poles.  At that time the engine died.  He believed he tried to start it maybe 2 times with the blower on.  There was an explosion and he heard his wife screaming “help, help.”  He looked at the engine compartment which was open and he saw the engine.  After hearing his wife yelling for help he thought she had been blown into the water so he ran below to get a life jacket.  He went on to explain that the engine compartment hatch was down and he saw his wife’s hand was sticking out of it.  It was at this time he opened the hatch and found her.  He explained that the engine fire had been extinguished by the on board plumbed fire extinguisher system in the engine compartment that he manually activated. His wife had burns over 40% of her body and some were 3rd degree burns.  She was placed in the critical care unit at Bronson Hospital.  Neither person was wearing a life jacket.  No other injuries were reported.