Scientists Found a 75-Foot-Deep World Beneath Michigan Unlike Anything Around It

At the bottom of Lake Huron, scientists discovered an environment unlike almost anything else in the Great Lakes.

About 75 feet underwater, Middle Island Sinkhole contains low-oxygen, sulfate-rich groundwater and thick purple and white microbial mats. Some of the cyanobacteria living there can even switch between different forms of photosynthesis depending on the surrounding chemistry.

Researchers study this unusual ecosystem because it may offer clues about what Earth’s oceans were like billions of years ago, before the atmosphere became rich in oxygen. Scientists have even discussed Lake Huron’s sinkholes as possible analogues for environments that could exist on Mars or ocean worlds like Europa.

In this DiscoverTube documentary, we explore the geology beneath Michigan, the strange microbes living inside the sinkhole, and why this hidden Great Lakes environment could help scientists understand both Earth’s ancient past and the search for life beyond our planet.

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