RedactedNarrative: Operator of Vessel #1 turned off kicker motor after fishing for approximately seven hours. Operator started Vessel #1 and noticed the engine was sputtering and put the engine in neutral to rev the engine.  Once the sputtering stopped, operator got Vessel #1 on plain and within five minutes, there was a large explosion from the engine compartment.  Passenger of Vessel #1 grabbed fire extinguisher and used all of it.  Operator and Passenger of Vessel #1 grabbed life jackets and the throwable and left the Vessel #1. Operator and Passenger were soon rescued by good Samaritan.