The laboratory accident happened on a Tuesday in October, 1923. Elias Thornwood was alone, reviewing soil samples from the Hudson Valley, when the centrifuge malfunctioned and a vial of concentrated mycelial extract shattered against the lab bench. A shard cut his palm. The liquid seeped into his bloodstream.

He felt nothing unusual at the time. A sting, a drop of blood on the linoleum floor, the curse that followed naturally. He bandaged his hand and went home to his apartment on Morningside Heights, where he drank whiskey and tried to forget the decade that had just ended—a decade of war and plague and men who believed they could rebuild civilization with blueprints and good intentions.

The changes began three days later. Elias noticed them first in his hands. The cut on his palm had healed, but the skin around it had grown strange—tiny filaments, white and threadlike, spreading from the wound like frost on a window. They did not hurt. They did not itch. They simply were, like a flower deciding to bloom.

By the end of the week, the filaments had spread to his wrists. By the second week, they had reached his elbows. Elias consulted three doctors. None could explain what he was experiencing. One suggested psychological factors. Another suggested poison. A third, an old man with kind eyes and trembling hands, suggested that Elias see a specialist in microbiology.

That specialist was Elias himself.

He locked himself in the lab for ten days, examining his own tissue samples under the microscope. What he found defied every principle of biology he had spent twelve years studying. The filaments were not foreign. They were his own cells, reprogrammed. His DNA had been rewritten by something that understood genetics the way a poet understands language—not as a code to be decoded, but as a living thing to be spoken.

The filaments were mycelium. Fungal threads. But they were woven into his nervous system, connected to his brain, and they were reaching down.

Elias could feel the earth below Columbia University. He could feel the mycelial network that stretched beneath all of Manhattan, a vast underground web that connected every tree, every garden, every patch of soil in the island city. And he could feel it dying.

The city was suffocating the network. Concrete poured over ancient soil. Sewers diverting the moisture that the fungi needed to survive. Chemicals leaching from the subway tunnels, poisoning the deep layers where the oldest and wisest colonies had lived for millennia. The network was shrinking, year by year, and when it was gone, everything above it would die too.

Not just the trees. Not just the worms. All life. Because the mycelial network was not just an ecosystem. It was the foundation of every ecosystem. It was the internet of the soil, and without it, the surface world was a house built on sand.