RedactedNarrative: Operator was driving the watercraft for the first time of the season from the public access to his residence. He was about 2/3 of the way across the lake when he smelled something burning (like plastic). He stopped the engine and opened up the hatch where the motor was housed. Smoke immediately began rolling out of the compartment. He used his fire extinguisher to try to put out the fire but it had little effect. The fire extinguisher was used until empty. The operator was the lone occupant of the boat and was assisted by some local fishermen. They continued to try and put out the fire but flames became large and they feared the boat, which was full of gas, would explode. They removed themselves from the area and waited for Perham Fire and Rescue to come to the scene. Perham Fire attempted to put out the fire but it continued to burn. The boat eventually sank to the bottom of the lake. No injuries occurred in the process and the operator was able to make it back to his residence safely. A life jacket was not being worn and alcohol was not a factor. The boat was recovered on 5/21/19. It is a Total Loss.