MICHIGAN CITY, Ind. (WLS) -- Scientists now know what causes a hole to open up at the Indiana Dunes three years ago, swallowing a six-year-old boy and nearly killing him.
Fungi on decaying trees formed a type of glue that formed empty spaces underneath the sand, scientists say. Those empty spaces can then collapse.
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The process left holes more than 10 feet deep in some places.
Mount Baldy has been closed since emergency crews pulled Nathan Woessner from a hole in 2013.
There's still no word on whether the park will reopen.
WLS
Mount Baldy in Indiana Dunes National Lakeshore