RedactedNarrative: VESSEL OWNER STATES THEY WERE UNDERWAY ON LAKE MICHIGAN AND HEARD A NOISE IN THE ENGINE COMPARTMENT. HE INVESTIGATED AND NOTED FLAME AT WHICH TIME HE DEPLOYED THE HALON FIRE SUPPRESSANT.  THIS WAS UNSUCESSFUL.  AT THIS TIME THE THREE SUBJECTS ON BOARD JUMPED OFF THE VESSEL INTO THE WATER.  ALL THREE SUBJECTS DID HAVE ETHEIR PRDS ON AT THE TIME OF THE INCIDENT.