That’s when he discovered the sinkhole. Authorities were called and the area was cordoned off. The sinkhole is approximately 40 feet deep and  is believed to have been caused by a collapsing vertical mineshaft.

The sinkhole has swallowed a tree and continues to grow.

For updates on this story, visit KCCI.

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Mathew Palmer, a former Delta Air Lines employee, at his home in Atlanta on Thursday, Oct. 9, 2025.  Palmer was fired less than two weeks after writing a post on social media about the assassination of conservative activist Charlie Kirk. (Natrice Miller/AJC)