Microbes mark the methane.
Anaerobic methane-oxidizing archaea (ANME) live in seafloor sediment exactly where methane rises from below — clustered at the sulfate–methane transition zone (SMTZ). We're not inventing this biology. We're trying to turn well-documented chemistry into a field exploration tool.
A microbial filter sits on top of every active seep.
The literature estimates this microbial filter consumes roughly 90% of the methane produced in marine sediments before it ever escapes into the water column. Their abundance is a direct indicator of an active methane system beneath. More flux produces a distinct microbial signature — and reading that signature is cheaper than drilling to find out.
Honesty about the gap defines this round.
Established — peer-reviewed
ANME–bacteria consortia oxidise methane at the SMTZ (Orphan et al., 2002).
The mcrA gene is a specific molecular marker, detectable by qPCR.
Clade structure (ANME-1/2/3) shifts with setting and methane flux.
The microbial filter consumes most sediment methane (Knittel & Boetius, 2009).
What we must validate
That the signal can be captured by an autonomous in-situ platform — not only in a shore lab.
That microbe presence reliably predicts subsurface methane, including known false negatives — Semler & Dekas (2024) found methane-rich seeps that lacked ANME.
The lipid "Methane Index" is a lab mass-spec proxy on cores, not an in-situ AUV measurement. We won't conflate the two.
Sources: Orphan et al. (2002) PNAS; Knittel & Boetius (2009) Annu. Rev. Microbiol.; Semler & Dekas (2024). We treat the false-negative mode as central, not a footnote.
The make-or-break questions, up front.
Sediment vs. water
ANME live in the sediment, below the seafloor. A vehicle swimming above the seabed samples water. Can we obtain the sediment-hosted signal — or is a diluted water-column signal even detectable and specific enough? This is unproven, and it's risk #1.
Depth & integration
In-situ molecular sensing is demonstrated near the surface (~300 m) and on fixed instruments at vents (~1,800 m). Target basins reach ~4,000 m. Doing this deep, on a moving platform, in one integrated system, has not been done.
Component technologies exist; the integrated system is early — roughly TRL 3–4. This round moves the core method from concept to evidence. We don't claim it's near-ready.
How we retire each risk — cheaply.
We lead with risk because that's what this round is for. Each major risk has a concrete, low-cost way to be tested or contained before anyone scales.
Signal capture — sediment vs. water
PoC tests near-seabed / sediment-contact sampling against water-column sampling at a known seep. If the water signal is too dilute, we pivot to a sediment-interface sampler — decided with data.
Predictive reliability — false negatives
We validate at multiple known sites and pair ANME with complementary geochemical markers, so one false negative can't drive a call on its own.
Depth & integration — 4,000 m
We stage it: prove the assay and sampling at a shallower analog first, then integrate and push depth — leaning on the founder's bioprocess and field-integration track record.
Commercial adoption
We sell as a low-cost pre-screen alongside incumbents, not against them, and aim to land a paid design-partner survey before scaling capacity.
The enabling pieces are finally maturing.
Portable sequencing
Nanopore devices put genomic readout in the field, not a core lab.
In-situ assays
MBARI's Environmental Sample Processor lineage shows autonomous sample-to-result chemistry at sea.
Cheaper AUVs
Long-endurance autonomous underwater vehicles are now within reach of small teams.
Atmospheric CH₄ reached 1,921.8 ppb in 2024 — roughly 2.6× pre-industrial levels (NOAA). Mapping where the seafloor methane filter works, and where it fails, is valuable well beyond exploration alone, from climate science to methane monitoring.