Chapter 112: THE UPPER HATCH

Three answering knocks traveled through the iron grille, making Tera’s tool tremble against her palm. She withdrew it without striking again. Water continued running beneath the frame, but the narrow opening above it remained dark.

"That’s someone answering," Sio said, crouching beside her. "Not loose metal."

"Someone, or a mechanism reacting to what we’re doing." Tera wiped rust from the handle. "I’d prefer to find out before we start celebrating."

Rhea leaned toward the opening, turning one ear away from the water. A faint scrape followed, then something dragged across stone. She held up her good hand when Sio shifted closer. "There’s breathing. Wait."

A cough came from beyond the grille.

Angle lowered his canvas bundle. His red scarf had collected dust from the carriage, and he rubbed it between his fingers while listening. Caspian moved his sketch away from the runnel, leaving a dry patch of stone for Tera’s tools.

"Can you hear us?" Sio called into the upper opening. The scraping stopped. A voice answered, too distorted to make out.

Rhea nodded at his questioning look. Whatever lay beyond the opening, someone was alive inside it.

Tera examined the masonry above the discharge grille. The iron frame belonged to a separate rectangular housing, its edges concealed by silt and broken stone. She cleared a corner with her tool and exposed two bolts beneath the dirt.

"This might be an old access plate," she said. "The collapse buried it, but the frame doesn’t look badly twisted."

"Can we open it?" Angle asked.

"First we find out what’s holding it." Tera directed Sio to move loose rubble from the side. "If it carries weight from that wall, it stays shut."

They cleared the cover’s edges without disturbing the grille below. Its upper corners were fastened to masonry away from the fractured carriage shell. Tera checked the surrounding stone and pressed the tool against the plate to test for movement. It held without shifting the masonry. She worked the first bolt loose. Angle steadied the plate while she freed the second, and Caspian watched the hairline crack above it for any change.

A sour breath of trapped air escaped when the cover opened a finger’s width. Sio caught the smell of stale water, old fabric and something faintly medicinal.

"There’s space behind it," Rhea said, listening. "Someone’s moving closer."

The plate swung far enough to reveal a narrow inspection shaft. It ran inward several paces, narrowing where the metal had buckled before widening into a small chamber. Through the crooked opening, Sio could see one pale wall; the rest remained in shadow.

"Hello?" Sio called.

A face appeared in the distance: a woman with dirt across her forehead and hair cut unevenly near one ear. She stared toward the opening, unable to take her eyes off the daylight.

"Are you outside?" she asked.

"Very much outside," Sio answered. "Can you get to us?"

She crawled forward until her shoulders struck a crushed section of shaft. Turning sideways didn’t help. She withdrew with a pained breath. "No. It’s too narrow."

Angle tested the exterior opening with his eyes. Farther inside, the passage would barely fit a child. "How did you get in there?"

"There was a hatch near the upper holding compartments. It opened when the carriage rolled." She swallowed. "I crawled through before everything stopped moving. The hatch folded shut behind me."

"What’s your name?" Sio asked.

"Dessa. I was trying to reach the vents. I didn’t know this exit was buried."

Tera handed Sio an inspection lamp. He aimed its narrow beam through the shaft while Caspian checked the wall around the opening. Beyond the crushed section, Dessa could stand in a chamber with a dry patch of floor and a clear inner wall. She moved away from it when he asked, leaving empty space around both.

Unlike the compartment containing the six prisoners, he could see enough to place an opening safely.

"I think I can get you out," Sio said. "Stay where I can see you."

Dessa peered into the beam. "How?"

"It’s going to look strange. Don’t touch the edges. Walk through the middle when I tell you."

Sio checked the unobstructed stone beside the exterior hatch, then the pale wall inside. One portal could open outside, the other on the visible interior surface.

An opening spread across the inner wall. Dessa recoiled against a shelf and nearly dropped the bent spanner in her hand. Its paired opening appeared on the exterior stone near Angle. Gumm lifted his head from Sio’s collar, watching with interest.

Dessa stared through the opening at the sky beyond Angle’s shoulder. "What is that?"

"Your way out. Take the middle." Sio steadied himself against the rock. "Angle, catch her if she slips."

Angle moved beside the outer portal. Dessa approached slowly, holding the spanner close to her chest. She stopped at the edge when the daylight moved across her face, then bent to examine where the opening met the wall. Sio kept his hands clear of the rim. "The stone isn’t falling away. You can step through."

She swallowed and obeyed. Her boot emerged first, then her shoulder. Angle caught her elbow when her foot slipped on the uneven ground. She took one more step, but her knees gave way, and he lowered her onto a dry patch. Only after she was clear did Sio close the portals.

Dessa sat with both palms against the stone. She looked up at the open sky, blinking whenever the wind shifted through the grass.

Rhea offered her a canteen, then pulled the canvas beneath her shoulders so she would not have to lean against the cold stone. "Small drinks. How long were you trapped?"

"I don’t know." Dessa swallowed carefully, then rested the canteen in her lap. "The emergency light went out after the second day. There was water dripping from a pipe and food in a maintenance box. I thought somebody would hear me knocking."

"Four knocks?" Sio asked.

She nodded and lifted the spanner. Its head had been polished by repeated blows. "Four against the frame. Every time I heard something outside."

Caspian looked toward the carriage higher up the cut. "Then some of the knocks we heard may not have come from the other prisoners."

"Mine didn’t." Dessa rubbed an old restraint mark around her wrist. "I heard voices through the wall sometimes, though. Other knocking too, farther inside. I couldn’t tell where it came from."

Tera had returned to the open access plate. She directed her lamp toward an assembly behind the chamber wall. "Caspian, bring the diagram."

He joined her while Sio helped Dessa settle on folded canvas. Rhea stayed with the rescued woman, watching her breathing and the upper bank in turns.

Inside, a metal panel stood above a narrow array of pipes. Grime covered much of it, but several pictograms survived: a closed door, a water-level marker, and two branching lines ending at different symbols.

Tera compared them with the partial Legacy Index diagram. "This looks like a pressure-system inspection station, not a passage into the cells."

Caspian crouched at the opening. "That left branch. Does it match the external outlet?"

"Possibly. The other appears to run toward the flooded shaft behind the three-groove door." She traced the drawing without touching the fittings. "If the connections survived, there may be a way to test them separately."

Sio looked into the chamber. "Can we reach the controls?"

"We can reach the room. That’s not permission to open a pressure fitting." Tera pointed to a thick housing beneath the panel. "Those may be test ports. With suitable equipment, we could measure the two sides without turning the release wheel. The seals might also be damaged."

Angle crouched beside her. "Then we stop guessing whether the outlet is lowering the pressure at the door."

"If the ports still work," Tera said. "And only after someone checks how to isolate them."

Dessa was examining a tuft of grass between two stones, occasionally touching the spanner in her lap. Sio glanced from her to the pale shell above the drainage cut. She had carried that little spanner through the entire rescue, unwilling to let go of the only thing that had made her voice reach outside. The metal was dull except at its worn head. They had come looking for an answer and found someone who had spent days making the question audible.

Caspian copied the panel markings, then folded his sketch away from the wet masonry. "Mara needs this. The equipment list changes."

"And Dessa needs a medic," Rhea said. Dessa had tried to rise when they started packing. One leg folded beneath her, and she caught the rock before Rhea reached her.

Angle offered his shoulder. Dessa accepted it, still looking toward the hatch she’d been unable to reach.

Sio stayed with Tera as she secured the cover so they could reopen it without shifting the surrounding stone. The six prisoners remained behind the damaged carriage wall, with the three-groove door holding back the flooded shaft. A reachable chamber didn’t make any of that safe.

Tera marked the two possible test ports on Caspian’s diagram. "We have a place to measure from," she said. "If those pipes survived, we may finally learn what happens when the water moves."

Sio looked toward the carriage. They had rescued one person, while six more remained behind a damaged wall. The new chamber gave Tera a place to investigate the pressure system without standing beneath the fractured roof.

The three-groove door remained shut. Now they had a way to test the pressure before anyone reached for its release.