The message from Sorrel arrived unexpectedly, brief and uncharacteristically urgent for someone who'd always communicated with the same slow, deliberate patience as everything else about her.

One of the bio-domes has failed. Something in the heat regulation. Can you come.

Arista left within the hour, zeppelin construction paused mid-frame, genuinely worried, the bio-domes had been one of the gentlest, most collaborative things she'd ever built, and the idea of that particular agreement breaking down bothered her more than almost any engineering failure she could recall.

She found Sorrel at the affected dome, inspecting a cracked heat-vent junction with quiet concern, the growing produce inside visibly wilting from the sudden temperature drop.

"...Seal failure," Arista said, crouching to examine the joint, relief mixing with genuine focus once she saw the actual scope of the problem. "Not catastrophic. The vent cracked, not the whole system, I can fix this in an afternoon, this isn't a design flaw, just wear."

"I hoped as much," Sorrel said, some of her tension easing. "I did not want to trouble you during your expedition preparations for something small."

"It's never trouble. This project matters to me." Arista was already pulling tools from her kit, settling into the familiar, comfortable rhythm of an actual repair job.

It was mid-repair, replacement seal half-fitted, when a new figure approached, a demi-human man she hadn't seen before, younger than Sorrel, moving with none of the community's usual unhurried calm. He carried something in both hands, round, roughly the size of a large ball, dull metal casing scored and pitted like it had spent considerable time being battered against rock.

He set it down near the dome's entrance with visible, frustrated care, muttering something under his breath that Arista only half caught: something about this again, about the shoreline, about pollution that shouldn't exist in a place that had never once needed the word.

"...What is that?" Arista asked, curiosity immediately overriding the repair in front of her.

The man startled slightly, clearly not expecting an outsider to be present, then relaxed at Sorrel's small, reassuring nod.

"...Debris," he said, gesturing at the object with open, weary frustration. "Since the storms cleared, our shoreline keeps collecting it. Metal. Gears. Things that don't belong anywhere in this world's waters, washing up faster every week." He nudged the object with his foot, distaste evident. "We've never had this before. Not once, in all the years our people have lived along that coast. It simply started, the moment the weather changed."

Arista set down her repair tools entirely, crossing to the object and crouching beside it properly for the first time.

It was, unmistakably, mechanical, not driftwood, not natural debris, but genuine, deliberate construction. Gears, worn smooth from tumbling in current and surf. A curved plate of metal, scored with faint, deliberate etching she couldn't quite read, patterned in a style utterly unlike anything from the five known races. And embedded near its center, still faintly, impossibly warm to the touch despite however long it had spent adrift, a small, intact mechanism that pulsed once, gently, as her fingers brushed against it.

"...This isn't trash," she said slowly, turning it over, mind racing. "This is a part. Something that used to belong to something considerably larger, still partially functional even after however long it spent in open water."

Sorrel and the young man exchanged a glance.

"You think this comes from beyond the storms," Sorrel said.

"I think this comes from exactly the direction I've been trying to figure out for the past two weeks." Arista stood, still cradling the strange, battered gear-piece, feeling the shape of an actual answer finally, tangibly assembling itself in her hands. "Ocean currents don't move randomly. If debris like this is washing up specifically on your coastline, and only since the storms cleared—" she looked out toward the water, toward the horizon beyond it, toward wherever this had originally drifted from "—then this coast sits directly in the current path leading back to wherever it's coming from. That's not just a hint. That's an actual, physical bearing."

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The young demi-human studied her for a long moment, some of his earlier frustration giving way to cautious curiosity. "...You want to follow the trash back to its source."

"I want to follow the trash back to its source," Arista confirmed, grinning now, the entire zeppelin route finally, concretely taking shape in her head. "Which means I finally know which direction to actually point the zeppelin, instead of guessing off secondhand tavern rumors."

She looked down at the strange, gently pulsing mechanism in her hands one more time, turning it over, already itching to get back to her workshop and study it properly.

"...Mind if I take this with me?" she asked Sorrel and the young man both. "I promise I'll finish the seal repair first. But I think this is the single most useful piece of information anyone's handed me since the announcement dropped."

She finished the seal repair properly first, exactly as promised, testing the bio-dome's heat regulation twice over before she was satisfied it would hold, the wilting produce inside already perking up under restored warmth by the time she left. Sorrel walked her partway back toward the tunnel entrance, quiet gratitude in place of any need for further words.

Then Arista went straight to Colm, the strange, gently-pulsing gear piece still wrapped carefully in cloth, tucked into her bag.

She found him at his workbench, mid-lens-polish, and set the debris down in front of him without preamble.

"I need sea current maps. Anything you've got, even rough ones."

Colm blinked at the sudden request, then at the object itself, curiosity visibly overriding his usual careful reserve. "...Current maps. For open ocean, specifically?"

"Specifically the waters off the Demi-Human coast, and whatever lies beyond them heading outward. This washed up there—" she gestured at the debris "—and I want to trace the current that carried it, backward, toward wherever it actually came from."

Colm was quiet for a long moment, turning the request over with visible, growing frustration of his own.

"...I don't have anything reliable," he admitted finally. "Nobody does. That's rather the entire problem with open-water cartography in this world, the storms weren't just isolated to the map's edges. They affected general sea travel too, made any real distance sailing dangerous enough that almost no one's attempted it in living memory. Coastal fishing, short hops between harbors, sure. But genuine open-ocean current mapping?" He shook his head. "Nobody's had the opportunity. You can't chart a current you've never safely sailed long enough to observe."

Arista sat with that, the specific shape of the gap finally landing properly. "...So there's no existing data at all. Not rough, not outdated. Just nothing."

"Just nothing," Colm confirmed, though something in his expression had shifted now, not defeated by the admission, but energized by it, the same quiet hunger Bram had once described seeing in him back at the glassworkers' guild. "Which means, if we're doing this properly, we're not consulting old maps to plan a route. We're going to be making the first current map this world has ever had, in real time, as we fly."

Arista turned that over, and found she genuinely liked the shape of it despite the added difficulty. "...That's actually consistent with everything else about this project. Nobody's ever built a railway either, before I did. Nobody's ever built a weapon like the one I dismantled. If nobody's ever charted these currents, then charting them properly becomes part of the expedition's job, not a prerequisite we're missing."

"I can help with that, at least," Colm said, already pulling out fresh parchment, energy building now that he had an actual, concrete problem to apply his obsessive precision toward. "If I track debris density, drift patterns, wind correlation as we fly the actual route, I can build a working current model from direct observation instead of guesswork. It won't be perfect on the first pass. But it'll be real data, the first this world's ever had."

Arista grinned, already picturing the gondola's growing equipment list, optics for Colm, the strange gear-piece for reference, and now, apparently, live current-charting instruments as well.

"...We're basically building the first accurate map of this entire ocean as we go," she said, delighted by the scale of it despite the added risk. "No existing route to follow. No prior data to lean on. Just direct observation, best guesses corrected in real time, and whatever that piece of debris can tell us about the general direction to start looking."

Colm studied the gear-piece one more time, turning it carefully in his hands, something like genuine wonder settling into his expression.

"...I've spent years wanting to map something no one else had properly charted," he said quietly. "I did not expect it to be quite this literal."

"Welcome to the crew," Arista said, grinning. "Fair warning, everything about this project keeps turning out to be the first of its kind. I don't think that's going to stop just because we're finally leaving solid ground."

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