[SCENE 1]

The dock was empty when Leo hauled himself up the ladder. His arms were heavy. His fingers barely hooked the last rung before his knees buckled against the aluminum platform and he lay there, cheek pressed to cold metal, breathing air that felt like sandpaper in his throat.

The gill-slits sealed at the waterline. The System overlay was a dim wash behind his eyelids — not gone, just too low-energy to project clearly. He could feel the numbers without reading them. Low. Dangerously low.

He rolled onto his back. The dock lights were white pinpricks against the marine layer. Somewhere above, a gull was screaming.

"Leo."

Shell was sitting on the dock's edge, her back against a mooring bollard, a thermos in her hand. She wasn't smiling. Her water-treatment work jacket was zipped to her chin, and her face was pale in the dock light.

"You were supposed to be back by eight," she said. "It's ten-oh-two. You were under for three hours and forty-eight minutes."

"I know." Leo tried to sit up. His core shook. He got one elbow under him and held there. "How did you know I was—"

"Because I checked your entry point at six-fifteen and you weren't there. Because I sat here and counted every minute past the time you told me you'd surface. Because you did this exact thing last week and came up looking like a corpse, so forgive me for not assuming the best."

She set the thermos down and stood. Two steps across the dock and she was beside him, one hand on his shoulder, pushing him upright with a firmness that said she'd been holding back from doing this for hours.

"Drink," she said, pressing the thermos into his hands.

Leo wrapped both hands around it. The metal was warm. He drank — salt water with something herbal, the same thing she'd brewed after the dive to the chamber. It hit his stomach and his body processed it the way it processed everything now: not quite human digestion, more like a parallel system extracting energy through a different channel.

"How low are you?" Shell asked.

"Ten point three percent. That's reserves. It's — think of it like battery life."

"And you need what to function normally?"

"Fifteen is safe operating range. Below ten and the gill-slits start degrading. Below five and I can't breathe underwater at all."

Shell looked at the water. The black expanse stretched from the dock to the breakwater, flat and indifferent. "So if something had gone wrong down there—"

"I would have drowned."

"You would have drowned." She repeated it flatly, the way she repeated data at work when the numbers didn't match the report. Not angry. Just confirming. "What went wrong that almost did?"

Leo drank again. The thermos was half empty. "Nothing went wrong. The override worked. The bypass is sealed. The anchoring protocol at two-eighty is neutralized — it's not draining thread flow anymore."

Shell sat down next to him. Close enough that her shoulder touched his arm. "Start from the bottom. I need the whole thing."

"The node. Junction Seven. It's a maintenance system — not alive, not a creature. More like infrastructure. It regulates thread flow at a convergence point three hundred and seventy meters down. When I got there, it was at twelve percent capacity. My father repaired it in 2031, got it to forty-seven. It degraded back because the anchoring protocol kept draining it."

"And now?"

"Now it's recovering. The bypass seal means thread flow returns to the regulated network instead of being siphoned. The node estimated it would take time to rebuild, but forty-one percent and climbing."

"Forty-one percent of what? What does the node actually do?"

"It keeps threads from fracturing under pressure. Sixty percent of the thread loss above was from pressure fractures — the node failing, flow going unregulated, threads snapping like overloaded cables. The other forty percent—" Leo paused. The thermos was empty. He set it down. "The other forty percent was deliberate cuts."

Shell went still. Not silent — she was thinking, he could see the mechanics turning. "You're saying someone was cutting threads on purpose. Not the structure. Not pressure. A person."

"A tool. Abyssal Steel. The same material as the node's rings, the same material as my knife. Someone made a cutting instrument from deep-world technology and used it to make clean, surgical cuts in the thread network."

"Karl."

Leo didn't answer immediately. He looked at the water. The gull had stopped screaming.

"The node analyzed the severance pattern," he said. "Clean cuts. Precise. Targeting high-density thread junctions. Followed the topology of the network — meaning whoever did it understood the structure. Had mapped it. Knew where the critical points were."

"That sounds like your father."

"It sounds like my father."

[SCENE 2]

They walked. Not toward Leo's quarters or the lower dock — Shell steered them up the access ramp to Ring 3, past the closed bait shops, toward the observation platform that overlooked the eastern breakwater. The wind was stronger up here. Leo's body was still adjusting to surface gravity, and every step felt like wading through shallow water.

"You have the knife," Shell said as they walked. "Karl's knife. Mako gave it to you. If Karl had an Abyssal Steel blade and you have it now, that means he doesn't have one anymore."

"Unless he has another one."

"Would there be more than one?"

"The node is made of Abyssal Steel. The anchoring protocol at two-eighty is made of Abyssal Steel. It's not rare down there — it's construction material. Up here, I don't know. I only know my father had one. Mako gave it to me. Nobody else has ever mentioned one."

Shell leaned against the observation railing. The breakwater was a dark line below them, the ocean a black sheet beyond it. "So either Karl still has a second blade, or someone else got hold of Abyssal Steel and made their own."

"Or found one."

"Three years ago," Shell said. "That's when Crowe saw the white-blue line. That's when Greaves felt the chest vibration. That's when the cutting started according to Karl's journal — he wrote about thread damage beginning around the same time."

"Three years ago, Karl had already lost his transformation. He couldn't have gone below a hundred meters, let alone three-seventy."

"He could have gone below a hundred meters with regular equipment. Scuba gear. Rebreather. He just couldn't go deep enough for the protocol to activate."

Leo thought about that. "If he used scuba to reach the thread network at two hundred meters—"

"He'd need Abyssal Steel to cut the threads."

"He'd need Abyssal Steel, and he'd need to know where to cut."

"Which he would know, because he repaired Junction Seven. He mapped the network in 2031."

The logic was tight. Karl Warden had the blade, the knowledge, and the motive — if you considered the node's account of his philosophy. He'd tried to free Katherine from the Loom by destroying the structure she was woven into. What better way than systematically cutting threads until the whole thing collapsed?

Leo pressed his palms against his eyes. The fatigue was deeper than muscle tiredness. The reserves were so low that his body was cannibalizing — not memory this time, but proprioception. The dock railing felt slightly wrong under his hands, as if the distance between his palms and the metal had shifted by a millimeter.

"Shell. The cutting pattern. Did the node say it matched any maintenance protocol?"

"No. It said the pattern was consistent with a maintenance-type tool but didn't match any known protocol in the database."

"That's the part that doesn't fit."

"How do you mean?"

"My father did maintenance on Junction Seven. He knew the protocols. If he was cutting threads, he'd cut them along the same topology — the same path the maintenance system uses. But the node said the severance pattern matched no known maintenance protocol."

Shell straightened. "Meaning?"

"Meaning whoever is cutting threads has Abyssal Steel and knows the topology, but isn't following the maintenance path. They're cutting in a pattern that doesn't exist in the node's database. They're not maintaining. They're not repairing. They're doing something else."

"Something else. Something that uses the same tools and the same knowledge but a different map."

Leo turned from the railing. The wind had shifted, coming off the water in gusts that carried salt spray. "My father's journal — the one Mako gave me. Does it have anything about other people with deep-world tools? Anyone who might have come to Tidecrest? Anyone Karl was afraid of?"

Shell pulled her phone from her jacket. The screen glow lit her face. "I read the journal twice. He doesn't name anyone. But there's a pattern in the entries — he mentions a sound. Not the 7.83 signal. A different frequency. He heard it at night, from the shore, before he went back to the water."

"A sound from the shore?"

"From land-side. He was standing on the lower dock when he heard it. Not underwater — above the surface. He wrote: 'The frequency is wrong. It's not the node. It's coming from behind me.'"

Leo stared at her. "From behind him. From the city."

"From Tidecrest. Or from someone standing on Tidecrest who shouldn't have been there."

The observation platform creaked under their feet. Below, the breakwater lights cast white circles on the moving water. Leo counted them. Eight lights, evenly spaced. One was flickering.

"Karl went back into the water that night," Shell continued, scrolling through her phone. "September twenty-ninth, three years ago. The entry reads: 'The frequency is closer now. Not from the node. Not from the structure. From above. If they're here, everything I've protected is at risk. I'm going back down.'"

"'If they're here,'" Leo repeated. "He uses 'they.' Not 'it.' Not 'the structure.' A person."

"Or people."

"Whoever he heard from the shore — he went back to the deep to confront them. Or to protect the network from them."

Shell locked her phone and put it away. "This changes the picture. If Karl was cutting threads, why would he write about someone else being a threat to what he'd protected? He repaired Junction Seven. He mended the three threads at two-thirteen. Everything in his journal points to someone trying to hold the network together, not tear it apart."

"Unless he changed."

"Unless he changed." Shell nodded slowly. "People do."

[SCENE 3]

Morning. Leo had slept four hours on Shell's couch in her apartment above the water treatment plant. His body didn't need much sleep anymore — the protocol handled recovery differently than normal human physiology — but his mind needed the stillness. The reserves had climbed to fourteen percent by dawn. Still below safe operating range. He could function on the surface, but any diving was out of the question for at least a day.

He sat at Shell's kitchen table, eating toast — regular bread, no enhancement, his body processing it slowly — and reviewing the timeline on her laptop. She'd organized Karl's journal entries into a spreadsheet, cross-referenced with weather data, tide charts, and the water treatment records.

"The frequency Karl heard from the shore," Leo said. "What date?"

"September twenty-ninth, 2031. Two weeks after his failed override at the junction. He'd already lost his transformation by then."

"And the cutting began—"

"According to the node's analysis of thread degradation patterns, roughly three months before that. Late June, 2031."

"So the cutting started two months before Karl heard the shore frequency."

Shell pulled up a second column. "And the structure at two-eighty — the anchoring protocol — began growing in August. Karl's journal notes the first visible signs of structural expansion at two-eighty in mid-August."

"Cutting in June. Structure grows in August. Karl hears a frequency in September. He tries to repair the node. The repair fails. The structure absorbs his authorization key and becomes thirteen times more powerful."

"And then?"

"Then Karl comes back to the surface and three years of escalating thread damage begins."

Shell closed the laptop. "The sequence matters, Leo. If Karl was the one cutting, why would he write about going back to confront someone else? And if someone else was cutting, who had Abyssal Steel three months before Karl's failed repair?"

"The node. Does the node keep a log of all Abyssal Steel interactions?"

"You'd have to ask it."

"I'd have to go back down."

"Which you cannot do for at least another day." Shell's tone was flat. Non-negotiable. She poured him more coffee. "Fourteen percent. That's what you said when you woke up. You need fifteen to operate safely. You need twenty to dive. That's a day of rest minimum."

Leo wrapped his hands around the mug. The coffee was hot. Normal. The kind of thing he'd taken for granted before the protocol — food, warmth, solid ground under his feet.

"What do we do today?" he asked.

"We keep your cover story intact. The Board spot-check is in eleven days. You have fabricated dive logs that passed a preliminary review but got flagged for discrepancies. You have GPS-tagged photo requirements that you haven't addressed. And you have a senior diver named Crowe who's already reported you once and might do it again."

"Crowe won't report me again. I talked to him."

"Crowe won't report you about the knife because you talked him down. But the Board inspection is a different kind of animal. It's not personal — it's procedural. Hargrave can only cover so much."

Leo drank the coffee. It burned going down, and the sensation was real and grounding. "Hargrave said the inspector's name was Kessler. From the regional maritime authority. Not a local."

"That's right. Kessler doesn't care about your knife or your dive pattern. She cares about paperwork. She wants GPS-tagged photos at depth proving you were where the logs say you were."

"Which I can't produce, because I wasn't where the logs say I was. I was at three hundred and seventy meters with a maintenance node."

Shell pushed the laptop aside and leaned forward. "Here's what we can do. The registered standard knife in your locker is legitimate. Your dive logs pass a surface-level check. The photo requirement is the problem. Kessler wants GPS-tagged underwater images of you at the depths listed in your logs."

"The depths listed in the logs are fake."

"Mostly fake. The logs say you dove to sixty meters for salvage. That's plausible — other divers do it regularly. If we can get GPS-tagged photos of you at sixty meters with the registered knife, the inspector has what she needs."

"And the deeper entries? One-twenty, one-sixty?"

Shell hesitated. "We leave those entries vague. The inspector checks the first few entries for consistency. If the GPS-tagged photos match the log for the most recent dive, she'll accept the rest. Kessler isn't an investigator — she's an auditor. She wants the paper to match the evidence, not the truth."

Leo set down the mug. "When?"

"I can arrange it tomorrow. Hargrave will let us use the dock access during off-hours. I'll run the GPS recorder on the surface equipment and you go down to sixty, take the photos, come back up."

"With fourteen percent reserves."

"At sixty meters, what does that cost you?"

Leo thought. "Maybe half a percent. Sixty meters is barely below Stage 1 activation. The gill-slits handle it easily."

"Then we do it tomorrow morning before your shift. That leaves ten days of buffer before Kessler arrives."

Leo nodded. The logistics were simple. The lie was simple. The simple part was the part he could handle.

The hard part was the question he'd been circling since the dock. Who else had Abyssal Steel? Who was cutting threads in a pattern that didn't match maintenance? And why did Karl Warden's journal describe a frequency coming from the shore — from Tidecrest — two weeks before everything went wrong?

[SCENE 4]

Karl Warden lived in a ground-floor unit on Ring 5, the oldest residential block on Tidecrest. The building was prefabricated concrete with salt-stained walls and windows that had been painted shut for a decade. A rusted chain-link fence separated the building's entrance from the walkway. The fence had a gap where someone had cut the links and never repaired them.

Leo stood at the gap for thirty seconds before going through. His father's apartment had no visible lights, but Leo could hear the television through the wall — muted, cycling through channels, the blue-white flicker visible under the door.

He knocked twice.

The television volume dropped. Footsteps. The door opened six inches and Karl Warden looked out through the chain. He was fifty-four. He looked seventy. The transformation loss had accelerated his aging — not dramatically, but steadily, the way a building settles after its foundation cracks. His hair was white. His eyes were the same blue they'd always been, and they were wary.

"Leo."

"Can I come in?"

Karl studied him. The chain was old. It wouldn't stop anyone who wanted in, and they both knew it. Karl unlatched it and opened the door.

The apartment was small and clean. Not clean like someone who enjoyed cleaning — clean like someone who had nothing to leave lying around. A single bed, made military-tight. A kitchen counter with one plate, one glass, one set of utensils. The television sat on a milk crate, tuned to a fishing channel, the volume now at zero.

Karl sat in the only chair — a wooden kitchen chair pushed against the wall. Leo took the edge of the bed. They looked at each other.

"You look like you haven't slept," Karl said.

"I slept four hours. I'm at fourteen percent."

"Fourteen percent reserves. So the dive was expensive."

"More expensive than I expected. The bypass seal worked. Junction Seven is recovering."

Karl's expression didn't change, but his hands — resting on his thighs — went still. Not tense. Still, the way a person goes still when they're holding very carefully onto something. "You completed the harmonic override."

"Full completion. One hundred percent. Your attempt stopped at eighty-three."

"I know where it stopped." Karl's voice was quiet. Not defensive. Factual. "I know exactly where it stopped, Leo. I've measured that seventeen percent gap every day for twelve years."

"The node told me what your override failure did. It gave the anchoring protocol your authorization key. The structure became thirteen times more powerful because of your signature."

Karl nodded once. A small, contained acknowledgment. "I know that too."

"The node also told me something else." Leo leaned forward, elbows on his knees. "Forty percent of thread loss above the junction is from deliberate severance. Not pressure fractures. Not structural decay. Someone with an Abyssal Steel blade is cutting threads intentionally. Following a pattern that targets high-density junctions. For three years."

Karl's eyes moved. Not to Leo — to the wall behind him, to a point that existed twelve years ago in a memory Leo couldn't access.

"I need to ask you something," Leo said. "And I need you to answer it directly."

"Ask."

"Do you have a second Abyssal Steel blade?"

Karl looked at him. "No."

"Did you ever have a second one?"

"No."

"Then who does?"

Karl's jaw tightened. He looked at the muted television, the fishing channel showing a trawler dragging nets through gray water. "I don't know."

"Shell found something in your journal. September twenty-ninth, 2031. You wrote about hearing a frequency from the shore. From behind you. You wrote: 'If they're here, everything I've protected is at risk.'"

"I remember what I wrote."

"Who is 'they'?"

Karl stood. Not suddenly — the motion was controlled, deliberate, the kind of movement a person makes when they've rehearsed staying calm for a very long time. He crossed to the small window that faced the walkway and looked out. The gap in the fence was visible from here.

"When I came back to the surface," Karl said, "after the override failed, I could still hear the frequency. Not through water. Through air. It was faint — barely above the noise floor. But it was there, and it wasn't coming from the node. The node broadcasts at seven point eight three. This was different."

"Different how?"

"Intermittent. Patterned. Not a broadcast — a signal. Directed. Like someone was transmitting from a fixed point and didn't care who heard."

"From Tidecrest?"

"From Tidecrest. Somewhere on the lower rings. I never found the source."

Leo stood. "Why didn't you tell me this?"

Karl turned from the window. His face was drawn, and for the first time in the conversation, the wariness in his eyes had been replaced by something that looked like exhaustion. "Because I don't know if the signal is a person, a machine, or something I haven't considered. Because I lost my transformation trying to fight it twelve years ago and it didn't stop. Because you are my son and the only thing I have left to protect is you, and I will not put you in front of something I couldn't handle."

"You didn't tell me because you were afraid."

"Because I was outmatched. There's a difference."

Leo looked at his father — fifty-four, white-haired, sitting in a concrete apartment on the oldest ring of a city built over the ocean, watching fishing channels on a muted television. The man who had repaired Junction Seven. The man who had lost everything in a seventeen-percent failure. The man who had heard something coming from Tidecrest that he couldn't identify and couldn't stop.

"If someone on Tidecrest is cutting threads," Leo said, "I need to find them."

"I know."

"And I need to use every piece of information you have. Including the parts you kept back because you were trying to protect me."

Karl sat back down in the chair. The wood creaked. He looked at his hands — the hands that had held an Abyssal Steel knife at three hundred and seventy meters twelve years ago and hadn't been able to hold it long enough.

"There are twelve people on Tidecrest who dive the restricted zone regularly," Karl said. "I tracked every one of them for two years after I came back. Crowe, Greaves, Rusty, Dace, two others I don't remember their names. None of them had Abyssal Steel. None of them had anything close. But in October of 2031 — a month after I heard the frequency — one of them changed."

"Changed how?"

"Started diving deeper than before. Not dramatically — ten meters more than usual, here and there. Nothing that would trigger a System alert. But the frequency I heard from the shore? It stopped. The night this person made their first deeper dive. The signal went quiet."

Leo's pulse was steady, but something behind his ribs tightened. "Which person?"

Karl looked at him. "Mako."