RedactedNarrative: OPERATOR 1 WAS OPERATING VESSEL 1 WHEN THEY JUST LEFT THE DOCK AND BEGAN CRUISING ON PLANE. AS VESSEL 1 WAS UNDERWAY OPERATOR 1 NOTICED SMOKE COMING FROM VESSEL 1. THE OPERATOR WAS ABLE TO GET VESSEL 1 STOPPED AND A PASSING VESSEL WAS ABLE TO PICK UP THE OPERATOR AND PASSENGERS FROM VESSEL 1. AFTER VESSEL 1 WAS STOPPED THE FIRE WENT OUT AND IT WAS INSPECTED, THE FIRE STARTED DUE TO AN UNKNOWN MECHANICAL FAILURE NEAR THE EXHAUST MANIFOLDS IN THE ENGINE COMPARTMENT. THERE WAS NO INJURIES TO ANY OCCUPANTS ON VESSEL 1 AND THERE WAS DAMAGE TO THE ENGINE COMPARTMENT.