“Groundwater from beneath Lake Huron is dissolving minerals from the defunct seabed and carrying them into the lake to form these exotic, extreme environments,” Biddanda said. “Those ecosystems are in a class not only with Antarctic lakes, but also with deep-sea, hydrothermal vents and cold seeps.”
…
The Lake Huron sinkholes are dominated by brilliant purple mats of cyanobacteria — cousins of microbes found on the bottom of permanently ice-covered lakes in Antarctica — and pallid, floating pony-tails of other microbial life