RedactedNarrative: THIS incident OCCURRED AFTER VESSEL 1 HAD JUST BEEN REFUELED. OPERATOR 1 ACTIVATED VESSEL 1'S BLOWER FOR APPROXIMATELY ONE TO TWO SECONDS BEFORE ATTEMPTING TO START VESSEL 1 WHEN IT EXPLODED AND CAUGHT FIRE. PASSENGER'S 3 AND 4 WERE EJECTED AND OPERATOR 1 JUMPED FROM VESSEL 1. PASSENGER 2 REMAINED ONBOARD VESSEL 1 WHERE HE WAS FATALLY INJURED.