The underground communities that have taken over Centralia, Pennsylvania

Centralia, Pennsylvania, was once a prosperous town, largely supported by the coal industry. But in 1962, a trash fire near an abandoned strip mine ignited what remained of the 25 million-ton coal seam beneath the town. Year after year, the fire spread, releasing noxious gas, opening up sinkholes, and ultimately making the town uninhabitable — for humans, at least.In the absence of humans and in the presence of rapidly heating soil, some interesting microbes have appeared: thermophiles. T