The lunch box knocked again.

It was not a loud sound. The plastic was too far inside the crawlspace for that. It came back through the low opening as a dull tap, then a faint scrape, as if one corner had dragged over concrete and stopped.

Kai kept his left shoulder against the lower rail. The red cord around his right forearm, just above the blue band, had gone dark with water. It had tightened into the skin there, pinning him in place. His fingers had been numb for long enough that he had stopped trying to flex them. When the lunch box scraped, the blue band around his forearm tightened anyway.

Nia turned her head toward the opening.

"Don't go in," he said.

She looked at him once. Her hair was stuck to her cheek. There was dried blood on one knee and fresh water shining across both bare feet. The witness ring around her calf had dimmed to a narrow blue bruise, but it was still there.

"I'm not going in." She nodded toward the mouth of the crawlspace. "I'm looking."

The difference was not comforting. The opening was too low to stand in and too narrow at the bend for either of them to get past the box. But it was the only place in the sump where the red pipe cut across the wall, and where the last blue line had disappeared.

Nia crossed the concrete slowly.

Kai watched her feet rather than the opening. There were blue-stained patches near the drain, old runoff darkening the floor in irregular shapes. She placed each foot on bare concrete, testing it before she moved her weight. The remaining boot hung above the grate by its soaked toe. The other was still crushed somewhere below it. Neither was close enough to matter.

At the red pipe, Nia lowered herself to one knee. She did not put a hand inside. She leaned toward the gap until her face was nearly level with the floor.

"Can you see it?" Kai asked.

"Part of it."

"The lid?"

"The bottom corner." Her voice changed as she spoke, flatter with concentration. "It's past the first squeeze. I can see the belt, not the handle."

The belt had been Kai's. In the weak light it was a black strip caught under the box's side, disappearing beneath plastic and broken concrete. The pipe hanger lay in shallow water behind Nia, bent into a warped U. For an hour, it had held the belt. Now it only made the floor harder to cross.

"The lace?"

Nia lifted one hand, asking him to wait.

The next sound was smaller than the first. Something ticked inside the crawlspace. Then the blue glow under the box brightened enough to show against the concrete.

Nia drew back a few inches.

"I can see it under the buckle side," she said. "It's stretched tight."

Kai swallowed. The bootlace was not tied to anything outside the box. It ran through the buckle frame and around the handle, meant to slow a torn belt and nothing more. The fact that it had gone tight meant the box had shifted against its own restraint.

"Can it hold?"

"For a while," Nia said.

He heard her answer and knew she had chosen the least frightening version she could say.

There was no way to reach the lace without crawling under the pipe. There was no room to turn around once the passage narrowed. Kai could not free his right arm from the rail without putting his shoulder through the cord, and Nia could not go in with bare feet and a light circling her leg. The crawlspace smelled of wet rust and the chemical sweetness of the blue residue. Even from where he stood, it made the back of his tongue ache.

Nia put her palm on the concrete beside the opening, not inside it.

"It may be settling," she said.

"It was already settled."

"Not like this."

The blue line appeared at the lip of the crawlspace.

For a second it lay there, thin as thread, following a crack in the concrete. Then it drew itself inward. The line did not rush. It did not pulse. It simply slid beneath the red pipe, under the edge of the box, and vanished.

The lunch box gave a hard, hollow jerk.

Nia flinched backward. Her heel skidded on the damp floor. She caught the pipe with one hand, but her bare sole came down in a smear of blue at the edge of the crawlspace.

The witness ring climbed from her calf to the back of her knee.

She made a sound through her teeth and shoved herself away from the wall. Kai pushed off the rail before he could stop himself. The cord bit into his arm. Pain ran from his shoulder to his jaw, sharp enough to make the room tilt.

"Nia."

"I'm off it." She was breathing too fast. "I stepped in it. I know."

She sat with her back against the opposite wall, one leg extended, the other bent close to her chest. She did not touch the ring. Her wet footprint remained beside the crawlspace, already thinning at its edges.

Kai held the rail with his left hand until the dark at the edge of his vision cleared.

"Does it hurt?"

"Yes."

"Can you stand?"

"Probably."

"That's not an answer."

Her mouth twitched, but she did not smile. "It will have to be one for a minute."

Inside the opening, plastic scraped over concrete again.

Kai stared past Nia. The visible corner of the lunch box had moved. It had not come back toward them. It had tipped deeper into the passage, enough that the belt showed at a new angle beneath it. A wet line crossed the plastic where blue residue had worked through the crack in the lid.

"The box is moving in," he said.

"I know."

"If it clears the narrowing--"

"Then it rolls somewhere we can't see."

Neither of them said what else could be under there. The reset valve was beyond the bend. Kai had turned it shut himself. The crawlspace had no reason to be carrying fresh water. It had no reason to be doing anything at all.

The lace gave way.

The sound was almost nothing: a quick, dry snap swallowed by the crawlspace. But Nia's face changed before Kai understood why. The blue light under the box flared once. The loose belt jumped, dragged an inch along the floor, and disappeared farther beneath the plastic.

The lunch box did not roll free. One of its corners caught somewhere beyond the bend with a thick, final knock. The crawlspace went still.

Nia looked down at the empty place near her ankle where the bootlace had once been, as though the missing weight might explain itself.

"It's gone," she said.

Kai did not answer.

Without the lace, there was nothing holding the buckle side in its old position. The belt was trapped beneath the box, slack and useless. A sliver of the lid remained visible before the bend. It had not opened. Hard blue light still showed through the same narrow crack. That was all he could say for certain.

Nia pushed herself upright with her palm against the wall. Her right leg shook when she put weight on it. She waited for the shaking to stop, then reached toward the pipe hanger in the water.

"What are you doing?" Kai asked.

"Getting that out of the way."

"Leave it."

"It is under the pipe. If it shifts, it will catch my foot again."

She hooked two fingers under the bent steel and lifted. The hanger was heavier than it looked. Water poured from its rusted channel onto her knuckles. She moved it a few inches at a time, keeping it low so it would not swing into the crawlspace mouth.

Kai could not help. His right arm was tied high and dead at his side. The Archive copy pressed dry and stiff against his ribs inside his jacket. He hated the paper for being safe when Nia was not.

When she reached the clearer patch beside the rail, Nia set the hanger down flat. The effort left a tremor in her shoulders. She looked toward the floor grate, then at the narrow strip of wall between the grate and the crawlspace.

"There," she said. "We can stand there without stepping over it."

The strip held one person easily. Two would have to stand sideways and keep close to the wall.

Kai nodded toward her marked leg. "Can you make it back?"

"Slowly."

They moved together without touching the box again. Nia went first, one palm against the wall. Kai followed only as far as the cord allowed, dragging his bad foot once before he found a position beside the lower rail. The space was narrow. Nia had to turn sideways to fit between him and the wall. Her shoulder pressed briefly against his chest.

The blue ring on her leg brightened once, then faded back to its bruise-colored line.

Neither of them mentioned it.

Beyond the drain, the scrape began.

It came from behind the inner grille, farther past the first bend where the locked Return Gate waited. Metal rasped once, stopped, then came again with a slower pressure behind it. The upper grate did not move. No light came through the throat of the drain except the dull blue reflection already pooled below them.

Nia turned her head toward the sound. "The scrape started after the box moved."

Kai listened to it fade. "Or after the leak reached the grate."

"Either way, that's worse."

She was right, and there was nothing useful to add.

Kai looked back toward the crawlspace. From this angle he could no longer see the box at all. The red pipe cut a dark line over the opening. The belt had vanished with the lace. A narrow blue reflection remained on the floor just inside the lip, but it no longer reached the sump.

The mouth of the crawlspace looked clear, but the bend was blocked. The lunch box had lodged across it, too far in for either of them to reach and too wide for a body to pass beside it.

Nia rested the back of her head against the wall. "You think the valve is still shut?"

"Yes."

"You sure?"

Kai thought of his hand on the cold wheel. The resistance under his palm. The last turn that had hurt his shoulder. "I shut it."

There was a metallic click inside the crawlspace.

Not the lunch box this time. The sound came from deeper in, beyond the bend, too clean to be plastic on concrete.

Nia looked at him.

Kai kept his eyes on the dark opening.

Nothing else moved.

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