A hidden world of living biomass thrives deep within the Earth's crust
In short: Beneath the surface lies a vast, previously unknown biosphere of microorganisms. These ancient organisms survive in extreme conditions—from boiling water to acid—and even breathe rocks and metals. Discover how geobiologists are uncovering a subterranean world that has existed for hundreds of millions of years.
For decades, the deep subsurface was thought to be largely uninhabitable. Nevertheless, an international team of researchers, featuring geobiologist Karen Lloyd, has uncovered a huge, obscured realm of biological mass within the Earth's interior. Such a biosphere comprises living microbes flourishing in conditions previously deemed unsuitable for life, such as settings with bleach, acid, and scalding water. The discovery of this active microbial community is reshaping the scientific consensus on where life can persist. This work builds upon the foundational research of scientists such as Kenneth Nealson, Katrina Edwards, and Jan Amend.
The mechanisms of these 'intraterrestrials' are profoundly alien to surface-dwelling life. Some of these microbes have been part of the Earth's crust for hundreds of thousands of years, while others belong to populations that have survived for hundreds of millions of years. Their metabolic processes are equally extraordinary; some species are capable of 'breathing' electrons, metals, or even rocks. These organisms inhabit environments that are radically different from our own. Their presence in the deep crust provides a unique window into the planet's long-term geological and biological evolution.
To study these organisms, researchers follow natural pathways where tectonic activity forces ancient groundwater to the surface, much like wringing out a washcloth. By sampling locations such as the rift basins in New Mexico, hot springs in Iceland, and the subduction zones of Costa Rica, scientists can observe the exchange of materials between the surface and the deep subsurface. This research, which Lloyd describes as requiring years of painstaking work to rule out contamination, is fundamentally transforming our understanding of Earth's deep history and the limits of life. The search for these microbes extends to the Arctic permafrost and the Andes. Scientists also investigate the ocean floor and the volcanic regions of New Zealand to map this hidden biosphere.
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Sources
- Summary by Intellect · source: Karen Lloyd: The mysterious microbes living deep inside the earth -- and how they could help humanity
- Also: Buried Alive: The Secret Life of Deep Earth Microbes- USC Dornsife Magazine
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