RedactedNarrative: THE OPERATOR AND PASSENGER WERE ON THE PWC AND WENT TO START IT.  THE PWC BLEW UP, SENDING THE OPERATOR AND PASSENGER INTO THE WATER CAUSING THE INJURIES TO THE OPERATOR. THE PASSENGER WAS THREE, SO THEY TOOK HIM IN AS A PRECAUTION.  THE EXPLOSION OCCURRED DUE TO PROBABLE FUEL LEAKAGE AND VAPORS, WHICH WERE IGNITED BY AN ELECTRICAL SPARK WHEN THE IGNITION SWITCH WAS ACTIVATED.