Markos's heart rate hit twelve at the second-floor boundary.
Kiran felt it through the carry, not counted, felt, the way you feel a motor stalling when you have your hand on the housing. The rhythm changed quality. The cardiac muscle wasn't producing clean contractions anymore. Each beat came with a slight irregularity, a hesitation in the interval that said the muscle was working harder than it could sustain to produce weaker results than it needed to produce.
He stopped walking.
"Pulse check," he said. Not to anyone. To himself, maybe. To the brainstem that was still running Markos's body like a machine that had outlasted its operator.
Mira was at his side before he finished the thought. Her fingers found the wrist. She counted for ten seconds and extrapolated. "Eleven. Point five." A pause. "The irregularity is worse."
"How much worse?"
"The interval variance has doubled since last check." Another pause. "His cardiac output is dropping. The tissue isn't getting adequate perfusion."
"The wound-integration in his legs—"
"Is providing marginal caloric support. It's not enough to compensate for a heart that's running at this rate with this level of structural damage." She said this without looking at Kiran, her attention on Markos's wrist, her thumb still counting. "He needs something I don't have."
He knew what she didn't say: he needs something no one in this seam has.
"How far to the organ system?"
Sato, from three meters behind: "Two hours. Ninety minutes if we push."
"Push," Kiran said.
He lifted Markos and walked.
---
The problem with pushing was that pushing required resources, and resources were what the group had spent the last three days distributing between survival and survival-adjacent activities with nothing left over for speed. Sato's broken ribs had given her a ceiling on pace since before the wound. She pushed against the ceiling without acknowledging it, the kind of professional determination that treated pain as a scheduling problem rather than a physical reality, but the ceiling was there. Mira was uninjured but she'd been climbing for thirty-six hours and the seams at this depth were not kind to anyone with functional nerve endings in their hands and knees. Daveth was carrying both packs and his own size through passages that were not designed for either.
Kiran was carrying seventy kilograms of unconscious man and running on oxygen and stubbornness.
They pushed.
He tracked Markos's pulse by contact instead of stopping to check. The meaning-reader's skin against the back of his neck, the wrist that he kept his fingers against while he walked — imprecise data, but present. The pulse was there. Faint and irregular and slower than any cardiologist would accept, but there.
He kept his thumb on it like a talisman.
---
At the junction between the second and third floors, the seam intersected a wound-tissue pocket.
It was small, a colony of the wound's biology that had broken through the scar tissue's seal and established itself in a construction gap. Kiran felt it before the construct eye resolved it: the temperature rising, the air thickening with the biological density of the wound's environment, the caretaker frequency in his void-skin responding to the presence of tissue that still remembered it.
The tissue was warm against the seam's worked stone. Living cells in an architecture that had been built to prevent them.
"Stop," Kiran said.
The group stopped. Sato's hand went to the weapon at her hip by reflex, then stopped when Kiran crouched at the wound-tissue pocket rather than stepping away from it.
"What is that?" Daveth asked.
"The wound," Kiran said. "A small piece of it. The biology that's under all the scar tissue."
"Is it hostile?"
"No." He pressed his hand against the tissue. The cells registered the caretaker frequency and the familiar response came: the hesitation, the oscillation between incorporate-foreign-organism and permit-authorized-access, resolving in his favor. The tissue's tendrils rose and touched his void-skin and withdrew. The pocket's metabolic activity increased. Heat.
He had an idea that might be wrong.
"Mira," he said. "Can you position him here? As close to the tissue as we can manage?"
She understood the logic before he explained it. Her expression went through a rapid assessment and arrived at: possible, unproven, worth trying. "The wound-tissue provides metabolic support through biological contact. If his integration in the legs is still active—"
"The connection should still carry. The code can amplify the pocket's output. Directed at the integration points in his lower extremities." He paused. "Maybe."
The maybe was honest. He didn't know if this would work. He knew it had worked when he'd used the code to increase a pocket's heat output in the seam, the temperature had risen by half a degree in the area around Markos's body. Half a degree. A fraction of what would make a clinical difference. But the cardiac muscle was operating at the edge of what was sustainable and the edge was sensitive territory.
They positioned Markos with his legs resting against the wound-tissue pocket's surface.
The tissue received the contact and the tendrils touched the meaning-reader's skin and the shallow integration points in Markos's legs registered the connection. Kiran pressed both palms against the pocket and pushed the caretaker code into it, the way he'd pushed the frequency toward the pocket in the seam two days ago, a directed signal, conscious rather than automatic, his pulse-rhythm integration deliberately amplifying the caretaker frequency rather than just broadcasting it.
The pocket's heat increased.
Not dramatically. The cells amplified their metabolic output, generating heat that moved through the wound-tissue integration in Markos's legs into his circulatory system. Warm blood. The cardiac muscle received blood that was fractionally warmer than it had been. The heart's next contraction came slightly stronger.
Mira had her fingers on the wrist. She was counting.
"Thirteen," she said.
One beat gained.
It wasn't enough. It wouldn't hold without sustained contact, and they couldn't stay here, the seam wasn't a resting place, it was a passage, and the deeper authority's monitoring vibrations had been tracking them since the cavity. The longer they stayed in one location, the more attention they'd draw.
But one beat.
"It won't hold without the contact," he said.
"I know," Mira said. She was looking at Markos's face. Not at the numbers. At the face. "But his color is better. Marginally."
He looked. She was right, not better in any way that a photograph would capture, but the gray-pallor of inadequate perfusion had shifted fractionally toward something that looked less definitively wrong. The circulation had improved. A small improvement in cardiac output could ripple through the system in ways that numbers didn't fully represent.
He held the contact for five more minutes. The pocket's heat output stayed elevated. Markos's pulse held at thirteen, irregular, but not declining.
Then he lifted the meaning-reader and they kept moving.
"Thirteen," he said, mostly to himself.
"Better than twelve," Daveth said, from the rear.
"Yes."
They pushed.
---
The seam network at the third floor's boundary was wider than anything below it.
Vasik's marks confirmed it, the notation style shifted here, the cuts deeper, the notations more elaborate, supplemented with small indicators that Kiran couldn't fully read through the construct eye's degraded resolution but that Mira could. She translated as she walked: left passage, main arterial seam, connects to organ-system boundary in approximately forty minutes.
Forty minutes.
He checked Markos by touch. Twelve. The gain from the wound-tissue pocket had eroded over the hour of travel. Not to eleven — twelve, holding at twelve. The pocket's intervention had bought something. Not enough. But something.
He thought about the organ system. What he knew about it: it was referenced in Vasik's maps as a series of floors in the upper deep that corresponded to the biological architecture of the Abyss's underlying body. Not the wound's tissue, not the scar tissue, but the organs, the systems of a living god that the deeper authority's construction had incorporated into the floor structure. Floors that corresponded to something like a circulatory system. A respiratory system. Floors where the biological overlay was not a thin veneer on worked stone but the primary material, the architecture built around the biology rather than the reverse.
Kiran had passed through the outer edges of the organ system on his way down. He remembered the floors differently — warmer, more alive, the ambient mana signature richer than the typical designated floors. The pulse-rhythm integration had been more active there. The wound's biological rhythm was clearer.
The wound's biology was present there.
If the deep tissue responded to the caretaker code — if the organ system floors contained wound-tissue close enough to the surface to reach, if the code was still strong enough to direct rather than merely permit — there might be something that could maintain Markos's cardiac function past the twelve-hour window.
The if was still doing all the work. He knew that. The ifs were not the plan; they were the shape of the space where the plan would have to fit.
"Tell me about the organ system," he said to Mira. "What you know."
She didn't look back. They were in single file in the main arterial seam, Sato leading with the amber light, Kiran second, Mira behind him, Daveth rear. "The organ system is a designation used by Vasik and the research group for a cluster of floors between Floor 270 and Floor 285 where the biological substrate is primary rather than architectural. The deeper authority built its floor structure here the same way it built elsewhere, but the underlying biological systems of the body it sits on are substantially more present. The wound's tissue intrudes here without being contained, the deeper authority manages it but doesn't eliminate it. The floors are effectively hybrid: worked stone over living biology."
"The biology responds to the caretaker code."
"That's your hypothesis."
"Is it wrong?"
A pause while she navigated a section of seam that required both hands. "The tissue in the organ system floors is wound-derived. If wound-derived tissue at depth responds to the frequency you decoded from Aldremach's data, there's no structural reason the organ system tissue wouldn't respond similarly. The code is a frequency the tissue's programming recognizes, and the organ system tissue is older, closer to the body's original biology." Another pause. "Your hypothesis may be correct."
"How much current does it take to restart a heart?"
A longer pause. "That's a different question."
"I know."
"The wound-tissue isn't a defibrillator. Even if you could direct its metabolic output at the cardiac muscle—"
"Not defibrillation. Sustained support. The cardiac muscle isn't in arrest, it's failing under load. If the wound's tissue can provide continuous metabolic input to the myocardium—"
"Theoretically possible. The wound-tissue integration in his lower extremities is already providing systemic metabolic support. If you could establish a more direct connection to the cardiac muscle specifically—"
"Through the legs. Through the existing integration. If the signal were strong enough."
Mira was quiet for thirty seconds. "You'd need a wound-tissue concentration significantly larger than any pocket we've seen in the seam network. You'd need something the size of—"
"The organ system."
She stopped talking.
He kept walking.
Twelve beats per minute.
He kept his thumb on Markos's wrist.
---
Daveth spoke at the forty-minute mark.
"We got a problem," he said. No preamble. No tactical setup. The tone of someone delivering information that the group needed regardless of whether it was welcome. "Back passage."
Kiran turned. Sato had already turned, the amber light swinging around to illuminate the seam behind them.
The passage was empty. Nothing visible through the construct eye's degraded thermal. But his pulse-rhythm integration registered it: a frequency change in the worked stone. Not construction, the aggressive building pattern of the deeper authority's emergency response was different, louder, more disruptive. This was subtler. A pulse. A regular, directed vibration moving through the scar tissue in the direction of their position.
Not construction. Monitoring.
The deeper authority had been monitoring since the cavity. This wasn't new. But the monitoring vibration's frequency had changed, it was more directed now. Less like a system pinging its infrastructure and more like a system that had located a specific anomaly and was paying attention to it.
"It's not moving toward us," Kiran said. "It's watching."
"That's different from an hour ago," Daveth said.
"Yes."
"How long before watching becomes moving toward us?"
"I don't know."
Daveth nodded once, the nod of a soldier filing an unknown under known unknowns. He shifted the packs on his back and kept walking.
Sato said, without turning: "We don't change plan based on something that isn't attacking yet."
"Copy," Daveth said.
They kept moving.
---
The organ system boundary was marked in Vasik's notation with a triple cut and an arrow pointing inward. ORGAN SYS-ENTRY-N1. The meaning of N1 was presumably explained somewhere in Vasik's full documentation, which none of them had access to in the field.
Kiran pressed his hand against the wall at the boundary.
The temperature was different here. The worked stone had warmth that wasn't atmospheric — biological warmth, rising from below the stone's surface. His void-skin registered moisture, the exudate of the wound's deeper tissue pressing through microscopic gaps in the deeper authority's construction. The scar tissue here wasn't winning. The wound was present, barely contained, a living system pressing against the seal that covered it.
The caretaker code pulsed from his void-skin and the warmth in the wall intensified.
"It recognizes me," he said.
Mira, beside him: "The tissue's response?"
"Yes."
"How strong?"
He held the contact for ten seconds, measuring the warmth's increase. "Stronger than the pocket in the seam. Much stronger." He pulled his hand back. The warmth lingered in his void-skin like a handshake. "The organ system floors are what I thought they were. The biology is right here."
"We're entering a floor," Sato said. Not a question. A statement of situation. She was looking at the boundary opening, a structural gap where the seam network connected to the floor's interior through the deeper authority's construction. "Floor rules apply."
"Floor rules apply," Kiran agreed.
"Entities on this floor are going to be different from what we've seen."
"Yes."
"You know what they're going to do?"
He looked at the boundary opening. Felt the warmth pressing through the wall. "No. But the code will help."
"Will or might?"
"Might."
Sato's expression said she had expected this answer and had built her plan around expecting it. She moved to the opening and looked through. The amber light showed a floor interior: high ceiling, warm, the biological overlay thick on every surface, the bioluminescent colonies brighter than the floors below. The living Abyss.
"Daveth," she said.
"Ready."
"Mira."
"Ready."
She looked at Kiran. He was already holding Markos, the weight settled, his hands positioned for the carry.
"Twelve," he said. Still twelve. The meaning-reader's heart was still beating.
Sato walked through the opening.
They followed her into the organ system floor and the warmth hit them all like a door opening onto a room that had been breathing for a very long time.
---
The floor was alive in a way that earlier floors were alive in theory but not in presence.
The walls moved. Not dramatically, the biological overlay breathed, the slow contraction and expansion of tissue in a respiratory rhythm that matched nothing in human biology but was clearly, unmistakably rhythmic. Organic. The bioluminescence was warmer here, more amber than blue-green, the light produced by organisms that had developed in proximity to the wound's fever-temperature biology. The ceiling was high and dark and dense with something that wasn't quite moss and wasn't quite colony, a biological composite that his construct eye, running at five percent capacity, couldn't classify.
Kiran felt the caretaker code respond the moment he stepped through.
Not the faint pulse he'd been broadcasting since the deep seams. Something louder. The organ system's wound-biology registering his frequency and answering, the tissue in the walls amplifying its output, the warmth rising several degrees in the area immediately around him. His pulse-rhythm integration matched the floor's biological rhythm and the match felt like a hand recognizing another hand.
The entities came from the walls.
Not hostile. Not even particularly interested in the humans. They emerged from the biological material of the walls with the slow unhurried motion of organisms that had evolved from tissue rather than formed from concept — extensions of the floor's biology rather than separate creatures. Roughly cylindrical. Dense. Their surfaces moved with the same respiratory rhythm as the walls they'd emerged from. They oriented toward Kiran and didn't approach and didn't retreat.
"Watchers," Mira said. She had her research notation in hand, the small carbon-fiber tablet she'd carried through thirty-six hours of seam network. Writing while walking with the automation of a person who had been doing it for years.
"Do they attack?" Daveth asked.
"No," Kiran said. The caretaker code was active enough here that he could feel the tissue's response, not fear, not aggression, the neutral attentiveness of systems registering an authorized signal. "They're part of the floor's biology. They're monitoring."
"Monitoring the way the deeper authority monitors?" Sato asked. "Or different?"
"Different." He thought about how to describe it. The wound's tissue monitored through sensation, through the biological integration that linked cells in a network of shared data. The deeper authority monitored through its diagnostic architecture, the worked stone's immune-system function. "The wound's tissue is aware of what touches it. These entities are extensions of that tissue. They're aware I'm here."
"And they're not attacking because of the frequency?"
"Because I'm marked as authorized." He kept walking through the floor. The entities tracked his movement from their positions at the walls. "Don't touch them if you can avoid it. Don't threaten them. They'll stay passive as long as I'm broadcasting."
"What happens when you stop broadcasting?"
He didn't answer that.
---
The floor's center held a concentration of wound-tissue unlike anything he'd seen outside the wound itself.
Not a pocket. Not a colony breaking through a scar tissue seal. A section of the floor where the deeper authority's construction had been built directly over the biological material rather than replacing it, where the worked stone sat on top of living tissue rather than substituting for it. The tissue was visible: exposed in a roughly circular area five meters across, the biological surface pulsing with the floor's respiratory rhythm, warm and alive and connected to the wound's network below.
Kiran felt the connection through his void-skin at twenty meters.
He walked to it. Set Markos down at the tissue's edge. Pressed his palm against the living surface.
The caretaker code hit the tissue like a key hitting a lock.
The tissue responded with the full output of the organ system's biology, not a pocket's marginal heat increase, not the attenuated response of wound-tissue far from its source. The full response. The wound's biology, contacted directly, receiving an authorized-access signal and amplifying every function it had available. Heat. Metabolic support. The biological infrastructure of a dead god's body, activated by a frequency it had been waiting eleven thousand years to hear.
The warmth climbed up his arm. Past his elbow. Into his shoulder. His pulse-rhythm integration synchronized with the tissue's rhythm and the synchronization was cleaner than anything he'd achieved below, the organ system tissue was closer to the wound's original biology, older, more faithfully preserved. The caretaker code carried further here. Hit harder.
"Markos," he said. "I need his legs against the tissue."
Mira understood before he finished. She positioned the meaning-reader's lower body against the exposed wound-tissue, his legs resting on the biological surface, the shallow integration points in his calves and thighs making contact with the tissue that contained the wound's full network.
The tissue received him. The tendrils rose from its surface, not to incorporate, but to interface. The integration points in Markos's lower extremities connected to the wound's biology through the exposed tissue, and the connection was direct, not the filtered signal of deep-seam pockets but the organ system's full capacity.
Kiran pressed harder against the tissue and directed the caretaker code toward the connection. Not a broadcast. A targeted signal: the specific frequency that the body's original programming used to authorize metabolic allocation. He was asking the wound to direct its resources to a specific location: Markos's cardiac muscle, through the circulatory connection that the existing integration maintained.
For thirty seconds, nothing.
Then Mira said: "Fifteen."
He held the contact. Kept the signal directed. His pulse-rhythm integration was working harder than it had since the deep tissue, the mutation operating at sustained output, matching the organ system's rhythm while maintaining the caretaker frequency while directing the allocation signal, three simultaneous functions that it hadn't been designed to perform simultaneously.
"Sixteen," Mira said.
His right hand was shaking. Not from the cuts, not from cold — from the effort. The mutation was pulling from his own reserves, the metabolic resources of his body being converted to maintain the signal's strength. He could feel it. The marine biologist's familiar awareness of what the body was spending.
"Seventeen," Mira said. A pause. "Eighteen."
Eighteen beats per minute. The number the meaning-reader had started with when Kiran first found him in the cavity. One hour of sustained contact at a deep wound-tissue pocket had temporarily raised it to thirteen before it fell. Five minutes of the organ system's full output had brought it from twelve to eighteen.
"Can we maintain this?" Mira asked.
He looked at his hand. The tremor had spread to his forearm. "I can hold for another twenty minutes. Maybe thirty."
"And then?"
"And then the signal attenuates and his cardiac output drops again unless we find another tissue concentration."
"Is there another—"
"I don't know. I've never been to this floor."
She looked at the floor around them. The exposed tissue. The entities in the walls. The biological complexity of a floor that sat on top of the wound's own architecture. "The floor should have multiple tissue concentrations. If the organ system is what you described, there should be—" She was already moving, moving away from them with her notation device, crossing toward the far wall where the biological overlay was thickest.
Sato's voice, from the floor's entrance: "Kiran."
He looked up.
The monitoring vibration in the worked stone had changed frequency again. Closer now. More directed. The deeper authority had been tracking the anomaly moving through its architecture and the anomaly had stopped moving and had found a wound-tissue concentration and was doing something with it.
The immune system was interested.
"How long?" he asked.
Sato's expression. "Twenty minutes. Maybe less."
Twenty minutes of contact. Then the deeper authority's response. Then either they ran or they fought something he couldn't fight with a blade he couldn't afford to use and a caretaker code that might not extend to the immune system's constructs.
Eighteen beats per minute. Holding. Markos's heart beating at the edge of adequacy, the organ system's biology pushing it past the line it had been falling below.
Kiran held the contact.
Twenty minutes. He would make twenty minutes count.
