Anyone checked the back of his neck??
Worked there in the 90s. The dune was moving a few feet every year, covering trees as it went. They eventually rot, opening up these holes. No mystery to anyone at the park service, only to stupid journalist. Use to climb the dunes at night and watch the sunset light up the chicago skyline. Other than that living there sucked. As did working for the nps and having to peddle their lies.