RedactedNarrative: OPERATOR 1 HAD BEEN SITTING ON THE DOCK WORKING ON VESSEL 1. WHEN OPERATOR 1 REMOVED THE SPARK PLUGS AND STARTED THE ENGINE TO VESSEL 1. DUE TO THE SPARK PLUGS BEING REMOVED IT CAUSED A FLASH FIRE TO OCCUR IN THE ENGINE UPON VESSEL 1 BEING STARTED. A FIRE OCCURED IN THE ENGINE COMPARTMENT OF VESSEL 1 CAUSED OPERATOR 1 TO SUSTAIN INJURIES FROM THE FLASH FIRE. VESSEL 1 DID NOT SUSTAIN ANY DAMAGES FROM THE FIRE.