The giant holes found at the bottom of Lake Michigan were first spotted by sonar images two years ago and recent findings have determined they are not man-made.
'This is a whole new avenue of research. I mean, there's now a geological question in mind. How did they form? Why are they there, specifically in the bedrock?' Wisconsin Maritime Museum Director Kevin Cullen told TMJ4 News.
'Any kind of new discovery in the Great Lakes is exciting,' Russ Green, a maritime archaeologist and superintendent of GLERL told Live Science.
Scientists are hesitant to describe the strange circles as sinkholes, which have previously been found in Lake Huron, but said they're more akin to craters.
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