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QEC ACTIVE
SHIP: Silt Aria
SYSTEM: Transit, day 67

Maret ran the test at 0340 ship time. She chose the window deliberately -- minimal crew activity, drive at steady state, the standing wave near the center of its four-hour cycle where the envelope is most stable.

I was there. Odelya was monitoring from the bridge. Kai stayed in his bunk and told us later he could feel it through the deck.

The protocol was simple. A single tone at the resonant frequency, introduced through the speaker array Maret had bolted to the conduit wall. Low power. Clean sine wave. She'd built a manual kill switch out of a relay and a toggle -- no software in the loop. If anything went wrong, one hand movement and the signal was gone.

She started the tone. For about thirty seconds, nothing. The standing wave continued its pattern. The flutter stayed where it was, gaps and all.

Then the gaps moved.

Not randomly. The shaped absences I'd described -- the punched-out spaces in the frequency band -- shifted to align with Maret's carrier. They wrapped around it. The flutter pattern reformed into something like alternation: tone, absence, tone, absence. But not at the carrier frequency. At the flutter's own rhythm. It took our signal and used it as structure without adopting its timing.

Maret killed the tone at ninety seconds, per protocol. The flutter pattern held the new shape for another eleven seconds, then collapsed back into the pre-test pattern over roughly forty seconds more. She has all of it on the spectrogram.

"Call-and-response," she said. But she didn't look happy about it.

I asked why.

"Because call-and-response implies two parties. I sent a signal and got a signal back. That's the story we'll tell ourselves. But look at what actually happened." She put the spectrogram up on the workbench display. "Our tone didn't change during the test. It was a fixed sine wave, totally static. The response -- the reorganization of the flutter pattern -- used our signal as material. It restructured around us. That's not answering. That's incorporating."

She's right. The distinction matters. In a conversation, both sides modulate. Here, we provided raw material and something else did all the modulating. We didn't talk to it. We gave it something to build with.

Odelya asked if we should report this. I said report it to whom. The commission hasn't answered in three weeks. Melchizedek is silent. Seriph's beacon is automated. There's a relay buoy at the next transit node but I don't know who's monitoring it.

We'll run the test again tomorrow with a more complex signal. Maret wants to try a frequency sweep to see if the response changes at different points in the resonant range. I agreed, but I set a condition: we log everything and we stop if the standing wave's base pattern -- not the flutter, the deep wave itself -- changes amplitude by more than five percent. We're poking at something that grew inside our ship without us noticing. The minimum responsible thing is to set limits.

Kai finally came down after lunch and looked at the spectrogram for a long time without saying anything. Then: "It's been in the walls since before Melchizedek went dark, hasn't it?"

Nobody answered because we don't know. But I think he's right. The branches were there when we opened the panels. They didn't grow in front of us. We found them already organized. Which means whatever this is had been listening to us -- to the QEC, at minimum -- for weeks or months before we noticed it was there.

I went back down alone tonight. Stood in the same spot. The standing wave felt different. Still the same base frequency, same chest resonance. But the flutter had kept a ghost of the test pattern. Not the full alternation -- just a slight bias toward the structure Maret's tone had provided. As if it remembered the shape and preferred it to what came before.

Shaped absence with a preference. I don't know what to call that. But it's not a malfunction and it's not geology and it's not anything in the engineering manuals. It's something in the walls of my ship, and it learned from us faster than we learned from it.

-- Thresh, crew lead, Silt Aria