Strawberry's Descent

Petrov had made a new list.

Arista had started, by this point, to feel a genuine, low-grade dread every time she saw him approaching with his notebook open.

His first list had organized the entire project. His second list had fixed the lighting. His third list, she'd already learned, usually meant they'd overlooked something fundamental.

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Steam venting.

Ventilation.

Heat buildup.

Station air quality.

Passenger comfort.

Arista stared at it.

"...How many of these existed yesterday?"

"Four of them," Petrov said.

"...I hate how useful you are."

The beautiful, infuriating part was that the actual problem, once she sat with it, fit the world perfectly, because none of it had ever occurred to the demons, and there had never been any reason it should.

A demon saw in dark caves. A demon didn't need to breathe the way humans or dwarves did. A demon found heat ordinary, comfortable even, the ambient temperature of home rather than something requiring management.

"Why would a tunnel need ventilation?" one of the demon crew leads asked, genuinely, when Arista first raised it, not dismissive, just honestly puzzled, the same way she imagined a fish might respond if asked whether it needed to worry about water pressure.

Then the first dwarven work crews arrived to help with the excavation, and the problem became considerably less theoretical, considerably faster.

"I can't see anything," one of the dwarven miners said, several meters into the newly cut tunnel, squinting against a darkness that apparently registered very differently for eyes not built for it.

The demon beside him gestured, unbothered, toward the nearby lava vein running just beyond a thin rock wall. "There's literally lava burning right next to you."

"That," the dwarf said, "makes it worse."

Arista pinched the bridge of her nose, standing between the two of them, feeling the actual shape of the oversight land properly for the first time.

"Okay. Right. Obviously." She turned to Petrov. "Heat radiating off ambient lava doesn't help visibility if you can't actually process infrared or whatever demons apparently do instinctively. And—" she glanced toward the tunnel's depths, already smelling faint traces of steam venting from the nearest boring rig section "—six months of continuous steam engine operation, deep underground, with six thousand people working in shifts. That's not just uncomfortable. That's actually dangerous if it's not managed properly."

"Heat exhaustion. Steam scalding in poorly vented sections. Oxygen displacement if venting's inadequate in the deepest stretches." Petrov ticked the risks off matter-of-factly, no drama in his voice, just the flat, professional cataloguing of a man who'd clearly seen real-world tunnel projects go wrong before. "None of this is exotic. It's the exact same set of problems any real-world subway or mining project has to solve. The only reason it wasn't already on your radar is that half your workforce genuinely doesn't experience the problem themselves."

"Which means I need a system that works for the people who do feel it, without demons having to think about it at all, since they'll never notice if it's broken." Arista was already sketching, mind shifting rapidly from crisis to design problem, the same reflex that had carried her through every previous obstacle. "Okay. Ventilation shafts, obviously, vertical exhaust points at regular intervals, venting excess heat and steam up and out rather than letting it just accumulate in the tunnel. That's straightforward engineering, nothing new."

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"The harder part's air quality specifically at the stations," Petrov added. "People are going to be standing around waiting there, not just passing through quickly on a moving train. That needs actual circulation, not just occasional venting."

Arista tapped her stylus against the growing sketch, an idea already forming sideways, the way they always seemed to. "...The steam itself might actually help, weirdly. If I route exhaust vents to draw through the platform areas before venting up and out, controlled airflow, pulling stale air out ahead of the fresh air being drawn in behind it: that's not fighting the steam system, that's using it. Same principle as a chimney draft, just applied at platform scale."

Petrov nodded slowly, adding a note to his own list. "That could work. I'll want proper calculations before we commit, but the underlying logic's sound."

Arista glanced back toward the dwarf and demon, still standing side by side at the tunnel face, one squinting in genuine discomfort, the other utterly unbothered, both of them staring at her expectantly.

"...Okay. New project. Give me a day. I'm going to go figure out how to make Hell breathable for people who actually need to breathe it."

The first ventilation test went excellently, according to the demons, which turned out to be doing a great deal of quiet, unacknowledged work in that sentence.

The first twenty minutes had, admittedly, gone perfectly. The boring rigs ran smoothly. The rails went down in clean, even sections. Lava glowed steadily through the observation panels, warm and constant. The air, by demonic standards, felt "pleasantly fresh."

Then Petrov arrived, with a human, in a cage.

Arista looked at it, very slowly, giving herself a full three seconds to process what she was actually seeing before attempting to speak.

"...Why is there a human in a cage?"

The demon crew lead looked proud. "Ventilation test."

A long, heavy silence followed, during which Petrov very deliberately looked away, the specific, pointed way of a man hoping desperately that someone else would be the one to handle this particular conversation.

"No," Arista said finally. "No, no, no. Explain."

The demon gestured at the cage, entirely earnest. "If he still acts normal, the air is good."

Arista stared at him for a long moment, letting the full weight of that logic settle in properly.

"You're using a human as a canary."

"Canary?"

"A bird miners used to bring underground to detect bad air."

The demon considered this for a moment, genuinely thoughtful. "...That's actually an excellent idea."

"No."

"Why not?"

"Because humans are not birds."

The demon looked at the human. The human looked back, entirely unbothered by being discussed in the third person while still technically inside a cage.

"...I also don't feel like this is my best work assignment ever," the human offered, from inside the cage, with the flat, resigned tone of someone who had clearly stopped being surprised by anything this project asked of him several days ago.

Arista pressed both hands over her face, dragging them down slowly, feeling the particular, specific exhaustion of managing six thousand demons who had, apparently, absorbed exactly none of the nuance around "humans are people, not sensors."

"Let him out. Now. Please."

The cage door creaked open. The human, a mid-tier Easy-mode volunteer, judging by his gear, probably recruited the exact same way she'd once recruited Pim, climbed out, stretching, entirely too relaxed for someone who'd apparently just spent twenty minutes as living lab equipment.

"For the record," he said, "the air was fine. Little warm. Little steamy near the tunnel face. Nothing I'd call dangerous."

"That's not the point!" Arista gestured helplessly at the now-empty cage. "The point is nobody should be in a cage determining that! We have actual instruments for this! Real, non-sentient, non-consenting-under-socialpressure instruments!"

Petrov, finally rejoining the conversation now that the immediate crisis had passed, cleared his throat. "In my defense, I found out about the cage at the same time you did."

"You brought him here!"

"I brought a volunteer. The cage was already here when I arrived. I want that on record."

Arista turned back to the demon crew lead, who still looked faintly confused about why any of this was a problem. "Okay. New system. We are not caging people, human, demon, dwarf, or otherwise, ever again, for any reason, especially not to check air quality." She was already sketching, the actual, sensible solution arriving now that the adrenaline of why is there a person in a cage had settled. "We build proper gas-detection instruments instead. Something mechanical. A sealed chamber with a reactive compound, Fen's alchemy guild probably has something that changes color with oxygen depletion or heat saturation, the same logic as her manaconductive liquid, just tuned for a different signal."

"An actual canary," Petrov said, "just not alive."

"Just not alive," Arista confirmed.

"Steam-pressure gauges at intervals, same as the boiler system. Heat sensors near the lava-adjacent sections. A chemical air-quality indicator at every station platform, checked regularly by whoever's on shift, no living creature, sapient or otherwise, required to sit in a box and vibecheck the atmosphere."

The demon crew lead nodded slowly, clearly still not entirely convinced this was an improvement, but willing to defer to her on it. "...If you say so, Strawberry. Seemed efficient, the other way."

"It was deeply, deeply not efficient," Arista said. "It was also extremely illegal in several jurisdictions I used to live in, and I'd like to keep that streak going here too."

The freed volunteer, dusting himself off, offered a small, genuine wave on his way out. "Thanks for that, by the way. Appreciate the rescue."

"I'm so sorry," Arista called after him. "You'll get double commission credit for this. I promise."

He gave her a thumbs up without looking back, already heading toward the surface, and Arista turnedback to Petrov, rubbing her temples.

"...Add 'no live canaries, human or otherwise' to the list. In writing. Explicitly."

Petrov was already writing it down, entirely deadpan.

"Already done."

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