SENTRY LINES

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Chloe cut the first microdrone's motor.

The aircraft dropped behind a low wall near the perimeter box. They lost the picture. The sentry kept turning without firing. Two others moved alongside the buildings; one stayed facing the living quarters.

"There are vibration sensors connected to the ground and the fences," Maya said. "The drone moved a part beside the box. That doesn't mean they can see the truck in the gorge."

"The drone weighed six hundred grams," Leo replied.

"And it lifted a metal plate next to a contact. We're not testing again from the same spot."

T.O.N.Y. enlarged the images. The machines weren't recognizable combat models. They'd been built as maintenance loaders to move heavy pipes and valves. Newly added plates covered their arms. Beneath them, cylindrical shapes suggested weapons installed by Voss or Roxxon.

"Source record," the interface said. "Stark Industries P-4 frames, designed for industrial logistics. The weapons are not part of the original design."

Morgan zoomed in. Beneath the weapon, there was still a pipe-lifting bracket. A dented plate showed the machine's load limit.

Chrysalis was finishing its cooldown on the workbench. Maya finalized the new exclusion zone around Morgan's ribs and checked the thermal fuses. Morgan would wear only the layer needed for protection, mobility, and tools. No prolonged flight. No wide shield. No improvising anything that would drain the entire reserve.

"Before we get to the plan," Leo said, "we have people in there."

Leo gathered images of windows and open passageways taken by the second drone as it approached from the side. By comparing clothing and movements, they counted fourteen distinct people: nine in the living quarters, four in a glass-enclosed gallery, and one accompanying the group. That camera alone gave them no way to examine closed rooms.

"Roxxon workers?" Chloe asked.

"I don't know," Leo replied. "But they're alive."

Some uniforms bore the emblem of an Arizona maintenance company. Two people wore lab coats; others had no readable identification. In the living quarters, a woman bent down beside a seated man who kept a hand pressed to his chest.

"Someone's in physical distress," Morgan said.

"I can magnify the movement, not make a diagnosis from the image," T.O.N.Y. said. "Medical care needs to reach them."

Pepper's independent team was still more than five hours away. Waiting meant leaving the workers under O.B.I.S.'s control and allowing pre-ignition to advance. Going in meant operating with incomplete information.

"We're sending the reinforcements the map of everyone's positions and the hostages' route now," Morgan decided. "If we lose contact, they won't start by looking for machines. They'll start by looking for people."

Leo transmitted the pared-down packet using two keys and shut the antenna off again.

The map also showed a convoy approaching from the south. Six vehicles were leaving a private road and heading toward the silo.

"Could be the team sent to take back the facility," Maya said. "Vance made it out of Acheron alive. The company's had time to mobilize people."

"Or the authorities," Chloe suggested.

"No public identification, and they have radio jammers," T.O.N.Y. said. "More likely a corporate force. Unconfirmed."

Morgan opened Arthur's plans. A maintenance corridor led into the silo from the west. The external box had an old coupler that required tones transmitted through physical contact in the correct sequence. Playing the frequency over a distant radio wouldn't be enough; they'd have to reach the door and check that the mechanism was still there.

"Maya drives the ground vehicle to this dry wash," Morgan said, marking a hollow to the north. "Leo and Chloe stay in the vehicle and set up an analog repeater. I go on foot to the west box, open the tunnel, and check on the people before touching the generator."

"You're not going in alone without an exit route," Maya said.

"The vehicle stays at the bend in the wash, a hundred and twenty meters from the door, if we can confirm access. It doesn't cross the inner circle. If the link goes down, I go back to cover."

Leo pointed to the sentries.

"They'll cross that wash in four minutes."

"Then we don't draw them in."

Chloe rotated the plans.

"There's a dead zone between circles three and four. Arthur marked it as a 'calibration zone.' The sensors ignore vibration there during maintenance."

"Or they did thirty years ago," Maya said.

"Which is why I'm sending the drone first."

The second drone followed the strip marked on the plans without touching the ground. Chloe kept it away from the boxes they'd already identified. New stakes, poorly covered cables, and tire tracks appeared that weren't on the drawing.

"I don't like this," Morgan said.

"Those stakes are new," Chloe replied. "I'll look from another angle."

When she changed the camera angle, she found a line under the sand. A small disk interrupted the wire beside a rock.

"Pressure-activated mines?" Leo asked.

"I can't tell what it does from the camera," Maya said. "Treat the area as off-limits. No vehicles go over it."

"Someone changed the passage after the map was made," Morgan said. "We're not using that strip just because the paper says it's clear."

They replotted the approach through a dip to the north. The inspection covered only the visible surface; it couldn't prove there were no buried charges. Maya would keep her distance and slow down. Morgan would follow a separate line on foot. If the passage wasn't accessible, they would pull back instead of blindly searching for another way through.

"And the main objective?" Chloe asked.

"People first," Morgan replied. "Then separate generator control from authorization. If we can cut the Icarus bridge without disabling pumps, ventilation, or exits, we do it. If not, we evacuate and wait for reinforcements."

"Voss?" Leo asked.

"He's not the priority if going after him puts anyone at risk."

"Abort criteria," Maya demanded.

Morgan listed them: loss of the channel for more than sixty seconds; internal temperature above the limit; loss of communication with the support team without confirmation by another means; any sign of geological instability; inability to keep the west route open. Chloe added another: if Arthur's plans differed from the actual structure at two critical points, the bypass would be considered unsafe. Leo would have the authority to cut the Icarus connection if O.B.I.S. tried to get through the repeater.

"And I pull the vehicle out if the suspension gets damaged," Maya said. "I'm not waiting for a vote while the sand swallows us."

"Approved," Morgan replied.

T.O.N.Y. recorded who would monitor each limit. The agreement didn't transmit a signature to Icarus; it was there so this team would know when to stop.

Maya handed out four analog emergency beacons, each with a physical pin. They wouldn't transmit their locations continuously, only once activated. Leo tested the batteries. Chloe wrote each person's name and the corresponding channel on white tape. Morgan clipped hers to the suit at her waist.

"If I lose consciousness, who stops the mission?" she asked.

"Any one of us," Maya replied.

"And if I order you to keep going?"

"The order doesn't count if it goes beyond the limits you just approved."

Morgan secured the device where anyone could reach it. Then she asked Maya to check that the strap wouldn't be hidden once the metal covered her waist.

T.O.N.Y. recorded the sequence. He added no heroic strategy.

At noon, heat shimmered over the sand. The four of them set out in the utility vehicle, Leo beside Maya, Chloe in the back with the radios secured in the cargo area. Near the marked wash, Morgan got out. She followed a strip of ground fifty meters to the side of the vehicle, wearing only part of Chrysalis, her mask open. The west box came into view beyond the next bend.

Chloe compared the camera view with the marked stakes. Leo monitored the receiver for signals from the maintenance points they'd managed to identify. They couldn't see every buried sensor. Morgan walked slowly enough to stop midstep when the information ran out.

They got past the first circle without an alarm.

On a stretch of dark rock, the sole of her right boot heated up before the rest of the suit. The fuse cut power to that boot's anchoring system.

"Anchoring function lost in the right foot," T.O.N.Y. said.

"The sole still supports my weight. I'll go back to the shade so you can check it."

"No powered traction on that side," the interface reported. "Don't rely on it for climbing."

Leo confirmed the disconnection; Maya agreed that Morgan could continue to the box, but only on foot along firm ground. The fault stayed on the panel. They didn't reset the fuse.

The third sentry changed direction. Morgan stopped. The ground vehicle's engine shut down. For thirty seconds, no one moved.

The machine continued west.

"It's following a pattern, not our position," Leo said, letting out a breath.

Chloe guided the second drone to a side window. The four workers from the gallery were entering the living quarters with the last person. The count was still fourteen. A smaller unit watched the door; none of them came out. After the last pass, Chloe brought the drone back to the cargo area. The third hadn't been launched yet.

"They're keeping everyone in there," Maya said.

Before bringing the camera back, they'd seen a man on a monitor in the control room. Elias Voss was working at a console with a cuff around his wrist. The image seemed to come from a fixed camera in a lower section.

Leo froze the frame and tried to read the timestamp. The line was cut off.

"Could be a recording," he said. "We don't know if he's still there."

"Then don't mark his position on the map as confirmed," Morgan said.

In the saved footage, Voss raised his head.

He was looking at the camera that had recorded him, not at the drone outside.

The voice came later, separate from the video file.

The maintenance receiver in the utility vehicle crackled.

"Morgan Stark," he said. "Your father buried a machine here because he was afraid of his own idea. You brought the only interface that can bear witness to what he tried to forget."

The audio came through a maintenance receiver near the utility vehicle. The tone had changed; it wasn't in sync with the lips in the frozen frame.

"Get out of the vehicle," the voice continued. "Or the next pulse won't be just a warning."

Morgan looked at the empty strip of ground beside her feet. She'd been out of the vehicle since the bend. The order might have been old; the danger wasn't.

Chloe searched for the source of the transmission.

"This is relayed audio," Chloe said. "It doesn't prove that's him speaking now. Maya, another maintenance order came through the receiver. Don't accept the route."

Maya shifted into reverse. The passage ahead looked clear, but the warning directed at the vehicle was enough to call off the approach.

The retreat began. It wasn't fast enough.

Beneath the sand, a series of metallic snaps raced toward the ground vehicle.

Morgan saw the first plate rise in the dry wash.

"Maya, back up!"

The explosion came from below.

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