A number of deep holes have appeared in the shifting sands of Mount Baldy, Indiana, then disappeared within a day.
Last summer, 6-year-old Nathan Woessner was walking across the sands of Mount Baldy in the Indiana Dunes National Lakeshore when he suddenly disappeared into a deep hole.
It took a team of rescuers about three hours to pull Woessner to safety from beneath 11 feet (3.4 meters) of sand and sediment, according to the Chicago Tribune.
More holes have appeared in Mount Baldy, forcing officials with the National Park Service (NPS) to close part of the park, located 55 miles southeast of Chicago on the shores of Lake Michigan. But why are these dangerous holes suddenly appearing in the sand dunes? [10 Strangest Sights on Google Earth]
"We don't know exactly what's going on out there," Ken Mehne, law enforcement specialist for the park, told the Tribune. "We can't let folks out onto the area until we know it's safe."
Deep holes appear and disappear
The incident deeply affected geologist Erin Argyilan, a professor of geosciences at Indiana University Northwest. She was doing research at the base of Mount Baldy when she heard the screams of Woessner's parents.
"I cried for three days," Argyilan, who was pregnant at the time and was unable to assist in the boy's rescue, told the Tribune. "I couldn't help in the moment. So now I have to do what I can to learn why this is happening."
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