RedactedNarrative: Details of investigation/incident:
  (7/14/2018 @ 1311hrs)
  I corporal was working as an indiana conservation officer. I was dispatched to a boat accident involving an explosion of the watercraft that injured one male operator. The area of the location was on lake of the woods in marshall co. The operator was already being transported to memorial hospital in south bend for his injuries. Sheriff's deputy was my contact at the scene of the incident who documented most of the information for me. 
  
  Deputy advised me of the watercraft owner and make of the boat with an indiana registration. Deputy explained to me that the jet ski exploded on the water then started to sink.
  I contacted owner directly on the way to the hospital. His story matched deputies story about what had happened. I asked owner if the jet ski was having any mechanical issues. Owner stated that it was having from fuel issues and contained a full tank of gasoline when is exploded. 
  
  I arrived at memorial hospital in south bend and spoke with the injured. Subject stated that victim was attempting to start the pwc when it exploded. He also stated that victim’s sister was attempting to start the same pwc before victim tried. When the pwc exploded it threw victim off of the machine and injured him. The extent of injuries are on his t11 and t12 vertebra for a spinal injury, muscle bruising on buttocks, and a fracture in the right foot ankle area. 
  
  Based on the facts of the incident i believe the explosion was created by the buildup of gasoline vapor in the motor compartment under the seat. Due to this area not being vented during the extensive time attempting to start the motor without success this buildup of gas easily ignited causing the explosion further igniting the full fuel cell all located just underneath the operators seat.