"We need to leave," Daveth said.
He said it standing at the lateral seam entrance, pack already on his shoulders, weapon secured, tactical display showing the corridor network that led from the organ system back to the main Abyss architecture. Ready. The posture of a man who had assessed the situation, reached a conclusion, and was waiting for his companion to reach the same one.
Kiran was at the construction.
His hand against the sealed stone, feeling the pulse from the other side. The signal had strengthened in the two hours since he'd last checked — not dramatically, the tissue restructuring was still in its early phase, but enough that the integration picked up the pattern's complex rhythm without straining. Clusters of two, gap, cluster of three, single pulse, long gap. Repeating.
"No," he said.
"Kiran."
"The signal is biological. Something on the other side of this seal is producing a biological signal that the wound's tissue is adapting to receive. If I leave now, I lose the only connection to whatever happened to Marek." He didn't turn from the construction. "The tissue is restructuring. When the restructuring completes, the signal will be fully received. The wound's biology will be configured to conduct it. That's when I'll understand what the signal is."
"And the immune system?"
"We have twenty-four to thirty-six hours."
"You gave me that estimate based on passive observation. You've had your hand on that wall for two hours straight, running the integration at maximum sensitivity." Daveth's voice had shifted from the tactical register to something harder. Not anger. The pressure of a professional disagreement where lives were at stake. "Every time you engage with the signal through the integration, the void-skin amplifies it. The wound's tissue is adapting to the signal. Your tissue is part of the wound's system. You're not just observing the restructuring. You're participating in it."
Kiran pulled his hand from the wall. Looked at it. The void-skin's markings were brighter than they'd been an hour ago, the bioluminescence running at elevated output in the area where his palm had been pressed against the tissue. The wound's biology in his skin, responding to the signal, amplifying it through the tissue wall, feeding it back into the restructuring process.
He'd known this. On some level he'd registered that his integration was contributing to the tissue's adaptation speed. He'd chosen not to examine the observation because examining it would mean confronting the tactical implication.
"I'm accelerating the restructuring," he said.
"You're accelerating the restructuring. Which accelerates the signal amplification. Which accelerates the immune system's detection timeline." Daveth came closer. Not threatening, not aggressive. Closing the distance because what he had to say required proximity. "Your twenty-four-to-thirty-six-hour estimate is wrong. With you actively engaging the signal, that timeline is shorter. Maybe much shorter."
"I'll limit my engagement. Passive observation only."
"You can't." The two words landed flat. "The integration isn't a switch you turn on and off. The void-skin responds to the wound's biology automatically. Standing in this corridor, at this proximity to the construction, with the signal bleeding through the seal, your body is going to amplify that signal whether you choose to or not. The wound built you to be an instrument. The instrument does what the instrument does."
He was right. The void-skin's integration with the wound's biology was automatic. Proximity-based. He couldn't stand next to the construction and not amplify the signal any more than he could stand in sunlight and not cast a shadow.
"Then I'll move back. Increase the distance."
"To where? The corridor is sixty meters long. The tissue restructuring extends ten meters from the construction. Your void-skin will engage with any wound tissue in your proximity. Unless you leave the organ system entirely, your biology will be contributing to the signal amplification." Daveth was in front of him now. Two meters. "We need to leave. Both of us. Maintain our exit route, get above the organ system, and wait for Mira's analysis of what Markos is receiving. We come back when we have information."
"If the immune system seals the organ system while we're gone—"
"Then we find another way in. Or we don't. But we're alive and outside, not sealed inside with no exit and no supplies for an extended stay."
Kiran looked at the construction. The pulse, faint through the sealed stone. The three entities at their twelve-meter positions, motionless, oriented to the signal's source. The tissue walls, warm with the slow metabolism of cellular migration.
"I can't hear the whisper," he said.
Daveth stopped.
"The whisper is gone. The broadcast is gone. The personal signal that changed at Floor 210, the one that said 'you have not lost what you believe you have lost,' that's gone. For fourteen months I have had the wound's voice in my biology. It's been a constant. It's been the only signal that connects me to what's behind the door, to what happened to Maya and Lena, to why I'm here." He looked at the construction. "This pulse is the only signal left. If I leave this corridor, I lose it. And I am standing in the silence of a body that was built to receive a signal that is no longer transmitting, and the only sound is coming from the other side of that seal."
The corridor was quiet.
Daveth looked at him for a long time.
"You're not staying because of Marek's signal," he said. "You're staying because the whisper stopped and you can't handle the silence."
The words arrived with the particular accuracy of someone who had been watching closely enough to see what Kiran had been avoiding.
He didn't deny it.
"The signal might carry information about Marek," he said. "About the door. About what's on the other side."
"It might. And you could receive that information through Markos's translation from the surface facility, through Mira's analysis, through any number of channels that don't require you to stand inside the immune system's closure zone and accelerate the timeline on your own burial." Daveth's voice was controlled but the words hit without padding. "I followed you into this. I came back into the Abyss with you because I believe in what you're doing. I believe the door is real and the promise is real and the mission is worth the risk. But this isn't the mission. This is grief. And grief doesn't make good tactical decisions."
The three entities at the perimeter didn't move. The tissue walls pulsed at their low baseline. The signal from beyond the construction continued its pattern, clusters and gaps, the rhythm of something operating on the other side of a wall that was supposed to be impermeable.
"You're right," Kiran said.
"Then we leave."
"No." He said it quietly. "You're right that this is partly grief. You're right that the silence is harder than I expected. You're right that I'm not making this decision from a purely tactical position." He looked at Daveth. "I'm staying."
Daveth's jaw worked. Three responses bitten back before the fourth.
"Then I'm staying with you," he said. "Because I'm not going to the surface to explain to Mira that I left you sealed inside the wound's biology alone. Copy?"
"Copy."
"But I want it on record that I think you're wrong."
"Noted."
"And if the immune system starts sealing the lateral seam, we leave. No discussion. We go."
Kiran nodded.
Daveth sat down against the opposite wall, set his weapon across his knees, and didn't look at Kiran for a while.
---
The immune system responded in eight hours.
Not twenty-four. Not thirty-six. Eight.
Kiran was running a passive diagnostic at reduced sensitivity, attempting the compromise he'd promised — limited engagement, no direct contact with the construction, monitoring from the corridor's midpoint. The void-skin's integration was still active, still amplifying the signal through any wound tissue in its proximity, but at the reduced intensity of distance.
It wasn't enough.
Daveth felt it first. The tactical display lit up at 14:20, seven hours and forty minutes after their argument, with returns he'd never seen in the organ system before.
"Construction activity," he said. He was on his feet in two seconds. "Not at the cavity. The peripheral seams."
Kiran crossed to the display. The returns showed dense signatures forming at three points in the corridor network surrounding their position. Not entity signatures. Material signatures. The dense reading of the immune system's molecular architecture being constructed in real time.
"It's sealing," Daveth said.
The three seam connections that branched off the organ system's lateral access network were closing. Not the lateral seam itself, not yet. The secondary routes. The backup exits that Daveth had mapped during his perimeter sweep, the corridors that connected the wound's cavity zone to other sections of the organ system, the routes that would have given them alternatives if the primary exit failed.
The immune system was building walls. Three walls, simultaneously, across the three secondary seams, the dense worked stone forming in the tissue corridors with the speed of an immune response that had identified a threat and was executing its containment protocol.
"How fast?" Kiran asked.
Daveth was reading the construction rate. "The seams are narrow. Based on the material density readings — the secondary routes will be fully sealed within ninety minutes." He looked at the display again. "The southern secondary is already sixty percent blocked."
Ninety minutes. Their backup exits would be gone in ninety minutes.
"The lateral seam?"
Daveth switched the display's focus. The lateral seam, their primary exit, the corridor that connected the cavity zone to the main junction at Floor 155 and from there to the standard Abyss architecture above. The display showed the seam's full length. No construction signatures. Not yet.
"Clear," Daveth said. "For now."
"How long?"
"Based on the pattern — the immune system is working outward from the cavity. It sealed the closest secondary routes first. The lateral seam is further from the construction than the secondaries." He ran the calculation on the display. "If the immune system continues at this rate, applying the same containment protocol, the lateral seam starts seeing construction activity in ten to twelve hours."
Ten to twelve hours. Then however long the actual sealing took, depending on the seam's width.
"Call it twelve hours before the lateral seam starts closing," Daveth said. "Add three to four hours for the construction to complete in a seam that wide. Fifteen to sixteen hours until we're fully sealed."
Kiran looked at the display. The three secondary seams closing, the construction advancing through the tissue corridors at the steady pace of a biological system that had identified a breach and was methodically containing it.
He'd done this.
The realization had the flat quality of data confirming a hypothesis he'd been hoping was wrong. His presence in the corridor, his void-skin's automatic amplification of the signal through the wound's tissue, had accelerated the tissue restructuring. The accelerated restructuring had amplified the signal faster than his passive estimate had predicted. The amplified signal had crossed the immune system's detection threshold eight hours into a window he'd estimated at twenty-four to thirty-six.
His choice to stay had cut their timeline by two-thirds.
"You were right," he said.
Daveth didn't say anything. He was watching the display, reading the construction rates in the secondary seams, running the tactical mathematics of their remaining options. When he spoke, it wasn't about being right.
"We have twelve hours on the lateral seam," he said. "We can leave now and guarantee our exit. Or we can stay and try to get what you need from the signal before the seam starts closing."
"I thought you said we leave when the sealing starts."
"The sealing started in the secondary routes. The lateral seam is still clear. We have time." He looked at Kiran. "I didn't say I agree with staying. I said I'd stay with you. That means I run the tactical assessment, not the strategic one. You chose to be here. I'm choosing to help you survive it." He tapped the display. "Twelve hours. What can you learn from the signal in twelve hours?"
Kiran looked at the construction. The pulse from beyond the seal, continuous, its complex pattern running through the tissue that was rebuilding itself to receive it. Twelve hours of signal data, processed through the integration, with the void-skin's full amplification capability.
"Maybe enough," he said. "Maybe not."
"Then you'd better figure out which one fast." Daveth set the display to a continuous monitor on the lateral seam's status. "Because when that seam shows its first construction signature, we're going. Both of us. No discussion. You gave me your word."
He had.
He looked at the sealed construction. The signal pulsing through it. The tissue rebuilding around it. The immune system closing in around all of it, methodical and unhurried, the Abyss's own body walling off the section of itself that had been compromised by whatever was bleeding through from the other side of the door.
Twelve hours to learn what the signal was. Twelve hours in a space that was shrinking around them. Twelve hours that he'd bought with a decision that Daveth had told him was wrong and that the immune system's eight-hour response had confirmed was wrong and that he was going to use anyway because the alternative was the silence and the silence was a room he was not ready to sit in.
He walked to the construction and put his hand on the stone and felt the pulse and started counting.
