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Hollow earth wild life

Long-term sustainability of a high-energy, low-diversity crustal biome.

Geochemical, microbiological, and molecular analyses of alkaline saline groundwater at 2.8 kilometers depth in Archaean metabasalt revealed a microbial biome dominated by a single phylotype affiliated with thermophilic sulfate reducers belonging to Firmicutes. These sulfate reducers were sustained by geologically produced sulfate and hydrogen at concentrations sufficient to maintain activities for millions of years with no apparent reliance on photosynthetically derived substrates.
Long-term sustainability of a high-energy, low-div...[Science. 2006] - PubMed Result

There you have it! Life inside the earth.