Lake Michigan hides a secret that researchers have spent decades trying to explain. Sonar scans of the deep floor have revealed stone structures that look far too organized to be natural.
Lake Superior is the largest freshwater lake in the world by surface area, covering roughly 31,700 square miles. It holds about three quadrillion gallons of water, which is half of the entire volume of the Great Lakes system. The lake is so deep that its lowest point reaches about 1,333 feet below the surface, and its average depth is around 483 feet.The lake formed through a different process tha…