A Kent County man recently found a mysterious bunker about a mile into the Rogue River State Game Area.
The bunker appears to have been built recently and may still be under construction.
The structure is about 15 by 15 feet and almost 3 feet deep.
The man who found it says it is reinforced with sandbags which almost look like they are meant to stop incoming bullets.
The man called the U.S. Department of Homeland Security who referred him to the FBI.
Michigan State Police are investigating.
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