Deep abyssal clay sediments in organic-poor regions of the ocean present challenging conditions for life. Techniques for identifying cells at extremely low concentrations demonstrate that aerobic microbes are found throughout these deep clays in as much of 37% of the global ocean.
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Orcutt, B. Life in the deepest depths. Nature Geosci 8, 258–259 (2015). https://doi.org/10.1038/ngeo2378