A 2002 Polaris Jet ski exploded Friday afternoon at the three mile mark of the Downing Branch Cove of the Lake of the Ozarks. According to the Water Patrol, Gregory McDonald, 32, of Traverse City Michigan depressed the start button and claimed the water craft exploded. McDonald received moderate injuries and his passenger, Brady McDonald, 3, also of Traverse City, received minor injuries. Both parties were transported to Lake Regional Hospital.