CeleryKills

On deep shale, hidden ecosystems, and the shape of early environments

I like tardigrades, even to the point of having two stuffed ones from my spouse, and keeping a colony for three years before Covid. They are small enough to feel like a private joke, hardy enough to feel like a personal philosophy. I used to think of them as curiosities, cute survivors at the edge of biological possibility. Then I read about them showing up with rock-eating fungi in a gas shale hundreds of feet below the Great Lakes, and the tone shifted. Not cute anymore. Not even edge case. More like a reminder that what I call “surface life” is just one layer of a much older stack (Cockerill, “Ecosystems of Rock-Eating Fungus And Tardigrades Found Thriving Deep Within a Gas Shale,” 2026).

Ok, the source of this essay showed up in my feed the way certain things do when you have tuned your attention too tightly, almost by accident. Hidden ecosystems. Tardigrades. Those two filters, and suddenly Jess Cockerill’s piece, “Ecosystems of Rock-Eating Fungus And Tardigrades Found Thriving Deep Within a Gas Shale”, catches, not because it is flashy, but because it sits at the intersection of what I already think I know and what I keep forgetting to consider. I click through expecting another surface curiosity, something to nod at and move on from. Instead it is a gas shale, a buried formation that behaves less like a backdrop and more like a participant, and I find myself tracking the language carefully, as if the phrasing might reveal the fault line where assumption meets data (Cockerill, “Ecosystems of Rock-Eating Fungus And Tardigrades Found Thriving Deep Within a Gas Shale,” 2026; Moon et al., “Deep subsurface organic-rich shale supports abundant, diverse, and novel fungi,” 2026).

The article frames the discovery plainly: a hidden ecosystem of fungi, worms, and tardigrades thriving in the Antrim Shale, far beneath conditions once assumed inhospitable (Cockerill, “Ecosystems…,” 2026). The associated ISME Journal paper goes further, quantifying abundance and diversity in a way that feels almost excessive, 689 fungal OTUs and multiple phyla in water drawn from 247 to 556 meters below ground (Moon et al., “Deep subsurface organic-rich shale supports abundant, diverse, and novel fungi,” 2026). I keep returning to that scale. It is not a sparse population eking out survival. It is density with structure, a system that looks more like a forest floor than a crypt.

The conditions matter. The water sampled from the shale is not merely ancient in the poetic sense. It is isotopically traced to glacial recharge, likely last in contact with the surface over 11,000 years ago (Moon et al., “Deep subsurface…,” 2026). That detail collapses time into geometry. These organisms are not living in a place disconnected from history. They are living in a place where history is physically trapped, where meltwater carried life downward and then got locked into rock. I think of this as a kind of geological laundering of biology, not sterilizing but redistributing, seeding fractures with whatever could be carried through porous pathways.

The fungi are the most revealing actors here. They are not exotic in origin. Many belong to classes like Agaricomycetes and Dothideomycetes, familiar decomposers of complex carbon at the surface (Moon et al., “Deep subsurface…,” 2026). Yet here they are, functioning in a dark, methane-producing shale environment, presumably metabolizing fossil carbon trapped in the rock (Moon et al., “Deep subsurface…,” 2026). That continuity is unsettling in a productive way. It suggests that early Earth environments do not need to be invented from scratch. They can be modeled by rearranging parts of known systems, stripping away light, compressing space, and keeping the chemistry.

I find myself thinking about abiogenesis in terms of constraint rather than origin. Early environments are often imagined as vast, chaotic, and globally uniform. But the subsurface tells a different story, one of microenvironments nested within larger structures. Each fracture, each pore, offers localized conditions, gradients, and isolation. The paper’s finding that fungal cells can reach densities comparable to ocean water in a single drop of shale-derived fluid reinforces that idea, that life can organize itself at microscopic scales without needing global consistency (Moon et al., “Deep subsurface…,” 2026). It makes me wonder, what does “primitive environment” even mean if the relevant scale is always local?

The presence of tardigrades in this context complicates the narrative further. They are often framed as extreme survivors, capable of withstanding desiccation and radiation in laboratory conditions. But in the shale ecosystem, they appear as part of a functioning food web, not isolated relics (Cockerill, “Ecosystems…,” 2026). That shift matters. Survival is not the same as integration. In a sense, they stop being symbols and start being participants. It reminds me of how in some science fiction, like the underground ecologies in The Expanse, life is not a spectacle but a system negotiating its own constraints, quietly, without need for witnesses.

The history of this kind of research is itself a lesson. For decades, the deep subsurface was treated as microbial territory, dominated by bacteria and archaea, with eukaryotes assumed to be rare or transient (Moon et al., “Deep subsurface…,” 2026). The new findings disrupt that assumption, showing abundant fungal communities and even multi-organism interactions at depth (Moon et al., “Deep subsurface…,” 2026). There is a pattern here that feels familiar. We repeatedly underestimate life in places where we do not easily see it. The ocean deep, the soil, now the rock. It is not just a matter of detection. It is a matter of conceptual blind spots.

I think about early Earth again, but also about exotic environments beyond Earth. The subsurface is a kind of analog laboratory for both. It is dark, chemically active, and structurally complex. The ISME Journal paper even notes that methane production is tied to microbial conversion of fossil carbon in situ, indicating a stable, self-sustaining system rather than a transient intrusion (Moon et al., “Deep subsurface…,” 2026). That stability is key. Abiogenesis theories often hinge on sustained disequilibrium. The shale provides that, not in a single dramatic location, but distributed across a network of microhabitats. It feels less like a stage and more like a substrate that has been quietly rehearsing life’s possibilities for hundreds of millions of years.

There is something idiosyncratic about how I keep circling back to scale. Maybe it is because the idea of a complete ecosystem hundreds of feet underground does not fit neatly into my mental models. I keep asking, why here? Why this rock? The answer seems to be that “here” is not special. It is just underexplored. The research team even emphasizes that subsurface fungal diversity has likely been underestimated because it was never included in global estimates (Moon et al., “Deep subsurface…,” 2026). So we are not discovering an anomaly. We are correcting a map.

The sci-fi analogies come easily, but they are not decorative. They help me think about the structure of these environments. The shale ecosystem feels like a distributed “biosphere within a biosphere,” something closer to a layered simulation than a single world. In that sense, it resembles the kind of nested realities in speculative fiction by authors like Greg Egan, where life is not bounded by surface conditions but by the rules of its substrate. The difference is that here, the substrate is literal rock. It is not a metaphor. It is an archive.

It keeps echoing across the speculative landscapes I have carried around for years, those fictional places that now feel less like imagination and more like rehearsal spaces. In The Expanse, the underground ecosystems of places like Ceres are not about wonder, they are about logistics, about what happens when life settles into the cracks of an environment and refuses to leave. In Liu Cixin’s The Three-Body Problem, the idea of life adapting to extreme, constrained conditions, shaped by physics that do not care about human comfort, feels uncomfortably close to what this shale is doing: not theorizing survival, but normalizing it. Even in Europa Report, where the ocean beneath the ice is treated as a distant, almost sacred unknown, the assumption is that life, if it exists, would be microbial, fragile, waiting for discovery rather than already integrated into a functioning system.

But the shale complicates that narrative. If a rock formation on Earth can host a layered ecosystem with fungi actively degrading carbon and tardigrades participating in that web, then Europa stops being a blank slate and starts looking like a place where similar nested systems might already be operating, hidden beneath kilometers of ice, mediated by chemistry instead of sunlight. Mars, too, shifts in my mind from a dead surface to a potential subsurface world, where brines and fractures could hold the same kind of quiet, persistent biology. The science fiction I thought was about elsewhere starts to feel like it was always about here, about the parts of the world we have only just begun to touch, and only just begun to admit might already be alive.

I keep thinking about my tardigrade colony, about how I used to watch them contract into tun states, waiting out dry conditions like they were rehearsing for something larger. That image feels newly relevant. The subsurface is not a rehearsal. It is the performance. Life exists there in a steady, low-light mode that does not need to return to the surface to validate itself. And that raises a question I cannot quite settle: if life can operate this way, embedded in rock, feeding on ancient carbon, forming ecosystems in what we thought were dead zones, then what does “inhospitable” even mean anymore? It starts to feel less like a description of the environment and more like a limitation of the observer.

References

• Cockerill, J. “Ecosystems of Rock-Eating Fungus And Tardigrades Found Thriving Deep Within a Gas Shale,” ScienceAlert, 2026.
• Moon, Q. S. et al. “Deep subsurface organic-rich shale supports abundant, diverse, and novel fungi,” The ISME Journal, 2026.
• University of Michigan News. “Rock-eating fungi flourish deep below our feet,” 2026.
• Gizmodo. “The Great Lakes Are Hiding a Secret Underworld of Tardigrades and Rock-Eating Fungi,” 2026.
• Corey, Daniel & Redman, José, The Expanse (television series), 2015–2022.
• Liu, Cixin, The Three-Body Problem, 2006.
• Wohl, Sebastian et al., Europa Report (film), 2013.