The Marrow Room

The passage breathed against the silk line.

I had tied one end around a rib spur and the other across my shell. Each pulse of air tugged the strand toward the new seam, carrying the smell of fresh marrow with it. The opening was wide enough for me to squeeze through. It was also dark enough that I couldn’t see where the floor ended.

Vey had settled near the entrance with her injured leg tucked close. She watched me knot the line.

“You’re going in alone?” she asked.

“I’m going far enough to learn whether the floor holds.” I tested the strand with my weight. “If I pull twice, draw me back.”

“And once?”

“Once means I’m still looking.”

She gave the knot a firm tug. “I’ll be here.”

The seam had opened between two overlapping ribs, where years of dust and dried marrow had filled the gap. I pushed my head through first, then eased my shell past the edges. The passage sloped down. Its walls were smooth in places and ragged in others, with shallow grooves that held a greasy sheen.

I touched one with an antenna. The residue smelled like the marrow outside, stronger here. The air carried a second smell underneath it: damp, mineral, and faintly sour.

Not rot. Digestion.

I stopped and listened. The hollow behind me held the ordinary sounds of people trying to be quiet: a shift of gel silk, a tiny click from one of the ceiling mushrooms. Ahead, a fine scraping came and went.

I pulled once on the line, just enough to keep Vey attentive, then continued.

The passage opened into a low chamber. I reached the far wall and looked back. The space was larger than the refuge’s marrow pocket, though its ceiling sagged in a long shelf of layered bone. Pale marrow had gathered beneath it in a shallow pool. A thin stream trickled down the wall and vanished under the floor’s crust.

For a moment, I let myself measure the room as a place people might use. A shelf for food. A bed of gel silk above the wet ground. A patch for growing mushrooms, if the air stayed clean.

Then the scraping came again, close enough to vibrate through my feet.

The marrow crust beside the pool flexed. A segmented body pushed out of the floor, slick and pale, with a dark, mineral-hard point at its head. The animal was longer than I was and nearly as wide. It drove its drilling mouth into the crust, then lifted its head toward me.

Its body carried small hooks along the sides. The ones near its head had gathered a coating of softened marrow.