NOAA confirms discovery of 40 sinkholes under Lake Michigan

NOAA has confirmed about 40 circular structures at the bottom of Lake Michigan, identified as sinkholes. These were first detected in 2022 during a sonar survey and were recently explored in an expedition. The sinkholes, ranging from 91 to 183 meters in diameter, are located southeast of Sheboygan. They likely formed due to geological processes involving limestone beneath the lake. Similar sinkholes in Lake Huron support unique microbial communities. Scientists plan to study the Lake Michigan sinkholes to understand potential life forms and their similarities to early Earth conditions.