Encountered and followed up on while reading Death from the Skies!Desulforudis audaxviator (L., “sulfur-reducing rod” + “bold traveler”) has an ecosystem all to itself almost three miles beneath the earth’s surface.  It lives completely independent of the sun, on water trapped in basalt and energy from byproducts of radioactive decay.  Tough and adaptable as an old prospector, it’s carried with it everything it could possibly need for its journey into the depths of a South African gold mine.  After millions of years without oxygen, however, it can’t tolerate that any more.

Gold mine holds life untouched by the Sun