The old return diagrams showed every branch running downhill. Frank knew where the pipes actually ran, which was a different thing. Construction had joined the banquet overflow to the laundry drain eight years earlier and labeled the connection temporary. The label had outlived two renovations and most of the workers who remembered signing it.
Frank had the return diagram spread over two empty laundry baskets, weighting the curling corners with bolts. The diagram showed a clean, straight branch from the old camping chamber to the lower runoff line. Beside it, somebody had added a narrow loop in red ink, then written TEMPORARY CONNECTION across the loop in letters now faded to pale pink.
The connection had been temporary for eight years. The first removal notice was still under the second and third, its ink rubbed pale where the papers had been pinned to the cork. Somewhere along the way it had become easier for everyone to treat the detour as the pipe's intended route.
Behind the laundry wall, the return pipe made a soft chugging sound whenever somebody used the wash troughs upstairs. The sound was irregular, with a second, lower note that Frank recognized from the fountain rupture. He leaned close, his earless skull almost touching the warm copper, and waited for the next pulse.
RB sat on the rim of a basket with his nose pointed at the seam. His ragged tail tapped against the handle each time the pipe spoke.
"That's not supposed to come back through there," Frank told him. "Line ought to be emptying toward the runoff. If the upper branch is putting pressure into it, something has got the valves backwards."
RB squeaked and dropped into the laundry basket, vanishing through a gap beside the folded linens. Frank marked the top basket for washing before any of its linen went to the infirmary. Working with RB had improved his access to small spaces and complicated his understanding of what counted as clean laundry.
A goblin in a blue apron appeared at the laundry door carrying an armful of stained sheets. Her name was Fen, and she'd been on duty during the fountain failure. She set the sheets down when she saw the diagram.
"Nobody's going to turn the water off again, are they? We had the wash room shut for half a shift yesterday, and the infirmary wants these done before noon."
"I'm checking the return. Haven't touched your supply valve."
"It came up through the floor yesterday." Fen pointed to a darkened patch near the trough. "Not much, just enough to make us move the baskets. But one of the new girls thought it was wash water and stepped in it."
She dropped a wet apron onto the nearest basket, then picked it up again when she saw the clean linen beneath. Her hands were reddened from rinsing cloth in water that was hotter than she liked. "That girl, the one who stepped in it, asked whether she'd have to pay for the sheets she ruined. I told her to put them in the burn bin and go wash her feet. Now she's trying to find out whether the burn bin is going to charge us."
"Did the water reach her skin?" Frank asked.
"Through the shoes, yes. She went to Sella. I've kept the boots aside in case anyone wants a sample." Fen hesitated. "I'm not asking you to shut down the whole laundry. We've got people in the infirmary waiting for what we wash. I just need to know which part is making us sick."
Frank crouched beside the patch. The joints between the floor tiles had stained unevenly, showing where the liquid had spread from a maintenance grate in the corner. He asked Fen which trough had been running and whether the liquid had risen before or after the fountain line was isolated.
"Both times we noticed it, the upper wash trough was draining," she told him. "The first time the fountain wasn't even making a noise yet."
That didn't match his diagram. If the fountain branch and the laundry return were truly isolated, the lower line shouldn't have been able to push anything into an occupied room simply because somebody emptied a wash trough.
He followed the service passage beyond the laundry, where a series of narrow access panels sat close to the floor. The first opened onto the old camping line; the second served the newer return loop. Moss had sent a pair of goblins to clean the passages the previous night, and their chalk marks were still visible on the walls.
At the second panel Frank found a valve indicator pointing toward CLOSED. He put a finger against the painted arrow. The metal stem behind it was warm, which was odd for a branch that was supposed to have been shut off for days. He opened the viewing plug and saw water sliding past the gate.
"That's either a leaking seat or the wrong valve," he said.
Fen had followed him, careful to stay away from the stained grout. "Can you stop it?"
"I can find out why it's flowing. Stopping it without seeing where the pressure goes next is how we lost the wall."
A voice from the other side of the service grille answered him. "And how Construction ends up replacing walls that didn't need replacing."
A dwarf in a patched leather vest stepped into view through the corridor bend. She carried a canvas roll of pipe tools and had gray mortar dust on one cheek. Her name was Ketha, one of Construction's fitters, and she looked at the exposed pipe with the disappointed recognition of somebody who had been called back to a job she'd hoped was finished.
"They sent me because you put 'misidentified return' on the requisition," she said. "If you only want a seal changed, tell me now before I unpack."
"I want the line put where it belongs."
"That depends which line you mean."
Frank handed her the diagram. Ketha studied the red loop, turned the paper sideways, then swore softly.
"This drawing was amended after we opened the banquet wall. Somebody put the bypass here to keep the wash troughs running while the main drain was reworked. It should've been removed when they connected the new return."
"It wasn't."
"That's one possibility," Ketha said. "But I've seen a bypass blamed for a blockage farther down the line, and that doesn't end well for the crew that gets told to cap it. Show me the flow first."
"Exactly." Frank set the paper where both could see it. "I've been wrong about pipes I installed myself. I'd rather be wrong while they're still intact."
Ketha glanced up, apparently surprised to hear a maintenance worker decline an opportunity to blame Construction before the evidence was in. She rolled out her tools on a clean canvas square and asked for the last pressure readings.
Frank didn't have them. The old gauge at the laundry elbow had been taken away for calibration after its needle stopped returning to zero, and the replacement request was still pending. They would have to use a portable gauge and compare what happened when known sections were opened one at a time.
Getting the gauge took half an hour and a minor negotiation with Tev, who'd booked it for a reset-gate inspection. Tev wouldn't lend the instrument until Frank explained exactly what he intended to measure and which valve would remain untouched during each test.
Tev was on his knees beside a gate housing when they found him, one wrist pressed to the stone to hold a spring under tension. He listened without looking up. Only when Tev pinned the spring safely did Frank offer him the diagram.
"If I lend you that gauge," Tev said, "I don't get to finish the gate test before shift change."
"I can bring it back before then, if the coupling holds."
"That's not the answer I was looking for." Tev rubbed the dent left by the spring guard on his glove. "If it doesn't hold, call me. Don't send the gauge up the laundry chute and tell me it arrived broken."
"If you turn the upper line off while the downstream gate is shut," Tev warned, "the waste has nowhere to go but back through the laundry."
"That's what I'm trying not to do."
"Then take the gauge. And bring it back without sludge in the dial, because last time somebody borrowed it, I had to replace the glass."
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Ketha fitted the gauge to the inspection coupling while Frank held a shallow catch tray beneath it. Fen arranged for her workers to leave the upper trough empty. The needle climbed when the lower rinse valve opened, even though the diagram said that branch should have been isolated from the laundry drain entirely.
Ketha stared at the moving needle, then at the old diagram, and made an impatient sound in the back of her throat. "Well, that drawing's lying to us. The lower line's feeding back into the laundry when it shouldn't be connected at all."
The pointer settled. "And the line's filling faster than it can empty," Frank said. "That's why it's coming back up through the grate."
"We can cap the temporary loop."
"Not yet. What happens to the upper trough if we cap it with the original return still blocked?"
Ketha opened her mouth, looked again at the drawing, and followed the pencil line with a thick finger. "It won't drain. We need to test the downstream run first."
RB emerged from the open panel carrying a small wad of fibrous packing. His forepaws were black with sludge. He set the wad on the clean canvas beside Ketha's tools and gave a series of offended clicks.
"Don't put that on my tool roll," Ketha said.
"He thinks he found the blockage," Frank replied. "Probably right, too."
Ketha picked up the wad with tongs. It was old hemp packing, stiffened by mineral deposits, with a ribbon of black residue caught along one edge. The downstream coupling had once been sealed with the same material. If a piece had worked loose and lodged in the elbow, the bypass would have looked useful instead of dangerous, right up until the whole system began backing up.
They shut the laundry troughs for a controlled inspection and posted a notice at the upper door. Fen grumbled about the inconvenience but set her workers to sorting dry linen rather than leaving them idle. She also sent for a runner to tell Sella why the infirmary's clean sheets would be late.
The elbow curved away behind a buttress beyond Frank's reach. With pressure still in the branch, blind probing risked another rupture. Ketha rigged a temporary collection line into the lower runoff, checked that its receiving channel was open, then loosened the upstream coupling a fraction at a time. Dark water dribbled into the catch trough. When the gauge finally showed no trapped pressure, they removed the elbow as an assembly.
A plug of fibrous packing and lime scale sat halfway through the bend. Frank worked it free with a flexible hook, pausing when the metal caught rather than risking a scrape that would score the inner surface. RB watched from the dry ledge, whiskers twitching every time a piece of sludge dropped into the tray.
"That was a year's worth of trouble," Ketha said when the last wad came out. "Maybe longer."
"Probably started the first time someone used the bypass without flushing the old elbow clean."
"I wouldn't swear to that without the earlier reports."
"Neither would I." Frank checked the bore for damage. "We can swear it was blocked today."
The cleared elbow wasn't the whole fault. The temporary loop still crossed an older waste branch at an awkward angle, and its support strap had been fixed to a mortar joint rather than sound stone. Ketha fetched a bracket from Construction, drilled its anchor into intact masonry, and reset the branch while Frank held the pipe clear of the drain. They replaced the makeshift bypass with an accessible capped junction, labeled it out of service, and wrote down the parts they had used. A cleaned bend in a badly supported pipe would only fail again on a busier shift.
The change cost a length of new pipe, two brackets, a small supply of packing, and most of the afternoon. Ketha wrote every item on the order because she had no intention of letting the Core describe the work as a free adjustment.
Fen came back while they were fitting the last bracket, with her two newest workers waiting in the doorway. She'd got the emergency linen washed in the auxiliary room, but the load had been too much for its small troughs. One worker was holding a basket against her hip with both hands. The other kept shifting weight away from a foot wrapped in clean cloth. Frank recognized her as the girl who had stepped in the wastewater.
"Sella says she's all right for work as long as she keeps it covered," Fen told him, then turned to the girl. "No, you don't have to carry anything. I brought you because you wanted to see where it came from."
The girl looked at the opened pipe. "That's it?"
"A wad of packing got caught in the elbow," Frank said. "It backed up into your floor grate. We've taken it out, but Ketha's not finished checking the supports. Stay behind the chalk."
She stayed there for a little while, perhaps waiting for the fitting to look less ordinary than the thing that had frightened her. Then she asked Fen whether she could put the basket down. Fen took it herself.
Ketha required three distinct trials: a slow rinse through the empty branch, a regular wash cycle, and a full trough discharged from above. Sediment passed the inspection glass during the second, but none came up through the laundry floor grate. On the final run the portable gauge rose below its limit and fell with the flow. Fen watched the joint rather than the dial; she'd lost enough linen to a perfectly respectable-looking number on a bad instrument.
Fen stood on the threshold with her hands on her hips. "Can we wash things again?"
"Yes, this branch is safe to use," Ketha said. "But leave that corner grate uncovered until tomorrow. I want to see it after a full shift of laundry."
Fen nodded, then asked if somebody could help move the stacked baskets. The two newest workers had been sorting linen for hours and needed the room back. Frank helped carry the baskets while Ketha wiped down the work area, and for a while the emergency was indistinguishable from any ordinary day in an overworked laundry.
At the depot Moss examined the repaired diagram. She liked the actual pipe drawing better than the paperwork explaining whose budget should pay for it.
"Construction accepted the joint replacement?" she asked.
"Ketha signed the material line and the fitting work. I signed for isolation and cleaning."
"And the old loop?"
"Disconnected. Capped for inspection. Tagged so nobody mistakes it for an active return."
Moss looked at the cost sheet. "The Core's going to hate that."
"It'll like the laundry running."
"It'll like telling people the laundry's running. Paying for the pipe will be somebody else's fault."
A ledger notice appeared while Frank was putting away the cleaned hook.
MAINTENANCE LEDGER
MAINTENANCE LEDGER
Employee
FRANK
Classification
RANK 1: DUNGEON CUSTODIAN
Task
Return-line tracing and safe isolation
Operational credit
+22 XP
Rank 1 experience
36 XP
A falling customer had earned him two hundred and fifty points; a week of making the waste lines reliable had earned a fraction of it. The number itself did not trouble him. He wondered which accountant might be persuaded to trade a little of the dungeon's enthusiasm for falling adventurers into the purchase of a pressure gauge.
Before he left, Ketha returned to collect her tools. She had a strip of clean cloth tucked beneath the canvas roll, a small favor from Fen for helping get the washroom open.
"You were right not to cap the loop straightaway," she told him. "Would've flooded the upstairs trough before anyone got a warning."
"You found the support problem."
"Didn't need you to remind me." She stopped at the door. "Next time your drawing says temporary, don't wait eight years to invite Construction back."
"Next time Construction leaves something temporary, I'll mark the calendar."
Fen found Frank at his usual dining-room table after the laundry resumed. "The girl who stepped in that water came back," she said. "I've put her on the presses for a few shifts." Frank started to explain that the branch had passed its tests. Fen wasn't asking about the pipe. "Good," he said. "She'll have somebody she trusts nearby." Fen finished her bread and, for once, didn't mention the work waiting upstairs.