Mystery of dozens of giant circular structures at the bottom of Lake Michigan

NOAA survey ship and image of some of the calderas at the bottom of Lake Michigan

In 2022, NOAA experts were surveying the Great Lakes using sonar when they discovered circular structures at the bottom of Lake Michigan. These structures ranged in size from 91 to 183 meters, according to IFL Science on October 1.

During a survey conducted in August, a NOAA team traveled to an area about 14 miles from Sheboygan, Wisconsin, to study and counted about 40 circular objects.

“A geological question arises: How did the structures form? Why are they there, especially embedded in the bedrock of the lake floor?” asks Wisconsin Maritime Museum Director Kevin Cullen.

Mr. Cullen hypothesizes that these sinkholes are connected to underwater canyons formed by glaciers centuries ago.

However, Wisconsin shipwreck hunter Brendon Baillod suggests they may not be sinkholes, but rather calderas.

More research is needed in the future before it can be determined what the circles really are.

Source: https://thanhnien.vn/bi-an-hang-chuc-cau-truc-hinh-tron-khong-lo-o-day-ho-michigan-185241001095825499.htm