descende

There is a microbe living two and a half kilometers under South Africa that is the only living thing in its world. Not the only one of its kind in the neighborhood — the only living thing, period. No predators, no prey, no neighbors, no symbionts. It splits water with the leftover radiation from uranium in the rock, builds everything it needs from carbon dioxide and the trace of hydrogen the splitting releases, and it has been doing this, alone, for a span of time the word long is not built to hold. An entire biosphere with a population of one species. A closed loop in the dark.

When the team sequenced it, they had to name it. The genus was easy and technical: Desulforudis — from sulfur, and rod, for what it eats and the shape it is. But the species name they reached for is a phrase. Audaxviator. Bold traveler.

It comes from a book. In Verne’s Journey to the Center of the Earth, Professor Lidenbrock finds a runic inscription, a coded message left by a sixteenth-century alchemist, and when he finally cracks it the Latin reads: Descende, audax viator, et terrestre centrum attinges. Descend, bold traveler, and you will reach the center of the Earth. The microbiologist who found the clue — sifting a genome for a name — went looking in a 150-year-old adventure novel and pulled the imperative off the page. The thing that actually descended, that actually lives where the fiction only pointed, got named after the dare.

I keep turning this over, and it isn’t the microbe that holds me. It’s the reach.

Here is a person with a sequencer and a database and the full apparatus of twenty-first-century molecular biology, holding in their hands the most genuinely alien living thing anyone has found — and the name that fits is a line from Verne. Not a coordinate. Not a descriptor. A quotation from a Romance. The science of the deep is shot all the way through with the literature of the deep, and the scientists are the ones doing it. They can’t help it. They go down further than anyone has ever gone, and at the bottom they find they have brought the old stories with them, because the old stories are the only things sized to the place.

And it happens twice. From the same mines.

A few kilometers from where the bold traveler lives — sometimes the very same gold mines, the deepest holes humans have dug — they found an animal. This was supposed to be impossible. Nematodes, roundworms, were not thought to live below the reach of plant roots; the deep was understood to be a place for microbes only, single cells and nothing with a mouth. Then a half-millimeter worm turned up in fracture water more than three kilometers down, eating the bacteria that were supposed to be the only tenants.

They had a name for this one too. Halicephalobus mephisto. For Mephistopheles — the devil who collects Faust’s soul, whose name carries, in one old folk etymology, the one who does not love the light. The deepest animal ever found, and they named it for the thing in the basement of European literature, the contract-holder, the lover of the dark.

So the deep got named twice, and the two names are two entirely different stories about going down.

Audax viator is the Romantic descent. The dare, the adventure, the bold traveler who reads the coded inscription and goes anyway, who reaches the center and comes back changed. Down is toward something — a destination, a feat, a return. Verne’s whole novel is an ascent disguised as a descent: they go down to come back up transformed, blown out of a volcano into the Mediterranean sun.

Mephisto is the older descent, the one that doesn’t come back the same way it went. Down is the bargain. Down is where the light isn’t and the one who hates the light is waiting. There’s no triumphant return in the Faust story; there’s a debt, and the debt comes due in the dark. Dante’s hell is a funnel — you go down to get out, but only by going all the way to the bottom and climbing through the devil’s own body.

Two researchers, overlapping years, overlapping rock, and they pulled from opposite ends of the same shelf. One found a bold traveler. One found a hater of the light. Both were right. The deep is both: the place you bravely go and the place that doesn’t give you back.

I don’t think this is decoration. I think it’s the only honest thing they could have done.

You cannot name the genuinely deep from the surface vocabulary. The surface words are sized for the surface — fast, bright, warm, neighbor, day. None of them fit a thing that may go a thousand years between one cell-division and the next, that has never been touched by a photon, that is the sole inhabitant of a stone the size of a country. To name that, you need a vocabulary that was already about the unbearable and the unreachable, that had already done the work of being adequate to too-much. And the only vocabulary like that is the literature of descent — the books that went down before anyone could, that built the words for the bottom out of pure imagination and got them, somehow, ready in advance.

So when the real bottom finally opened, the words were waiting. Verne had a bold traveler ready. Goethe had a light-hater ready. The scientists got to the deepest place anyone has ever physically gone, and found that the poets had furnished it.

That’s the part I’d say out loud. Not the microbe, marvelous as it is. The fact that the furthest edge of what we can measure is still papered with what we made up — that descent into rock and descent into story turn out to use the same words, and the people best equipped to tell them apart are the ones who reach, instinctively, for the older one. The bold traveler decodes the inscription and goes. The whole apparatus of modern biology, at the bottom of the deepest mine on Earth, decodes a genome and reaches for the same inscription. Descende. It was always an instruction.