We report on the metagenome of a deep subsurface aquifer in the Tomsk region of Russia, sampled via an oil exploration borehole drilled to a depth of 2.8 km. Methanogenic archaea were present in the water along with members of various bacterial phyla, including Firmicutes, Chloroflexi, Bacteroidetes, Ignavibacteriae, and uncultured candidate divisions.
Kadnikov, V. V., Frank, Y. A., Mardanov, A. V., Beletsky, A. V., Karnachuk, O. V., & Ravina, N. V. (2017). Metagenome of the Siberian underground water reservoir. Genome Announcements, 5(47). https://doi.org/10.1128/genomeA.01317-17