The call came through before the dust in the tunnel had even settled.

  Nathan answered first — he always did — the phone pressed tight against his ear as he paced the length of the Halberg operations floor. Isaac and Howard stood nearby, listening to the fragmented updates from County Durham’s emergency operations center.

  Three workers trapped.

  Air quality dropping.

  Access blocked by debris and a narrowing choke point no human could pass through.

  The voice on the other end was brittle with urgency.

  “We need to know,” the operations chief said. “Do you have any units that can fit into a space smaller than a man? Stable enough to work in a compromised tunnel? We were told you had prototypes under internal testing.”

  Isaac’s pulse jumped.

  Nathan didn’t hesitate.

  “Yes,” he said. “We have units that can navigate tight passages.”

  “No,” Isaac said immediately, stepping forward. “They’re not field-cleared.”

  “Nathan,” Howard warned, “don’t overpromise.”

  The operations chief waited, breath audible.

  “We’re not asking for perfection,” he said. “We’re asking for reach.”

  Isaac took the phone from Nathan’s hand.

  “This is Dr. Newsome,” he said. “The A-series are not approved for human environments. They’re not validated for unstable structures. They’re not—”

  “They’re close,” Nathan cut in. “Very close.”

  “Close isn’t ready,” Isaac snapped.

  Julie entered the room, still holding Catherine’s empty bottle from upstairs. She took one look at Isaac’s face, one look at Nathan’s, and understood instantly.

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  “What happened?” she asked.

  Howard answered. “County Durham tunnel collapse. Three trapped.”

  Julie’s breath caught.

  “Air?”

  “Dropping,” Nathan said.

  The operations chief’s voice came through again, more strained now.

  “If you have something that can get through that gap, we need it. If you don’t, tell me now so I can call their families.”

  Silence expanded in the room like a pressure wave.

  Isaac swallowed hard.

  “They’ve only passed controlled drills. No real instability. No live obstruction mapping. No—”

  “Controlled drills are drills,” Nathan said sharply. “This is the field. The field is the point.”

  Howard stepped between them, hands raised slightly.

  “Both of you, stop.” His voice was gravelled but steady. “This isn’t about ideology or optics. It’s about whether the machines can physically get through the hole.”

  “They can,” Nathan said.

  “They might,” Isaac countered. “There’s a difference.”

  Julie placed Catherine’s bottle on the table and spoke quietly but firmly.

  “Risk,” she said, “is not the same as necessity. You can’t eliminate danger for the people inside that tunnel. But you can choose where the danger goes.”

  Isaac’s jaw clenched.

  He couldn’t look at her because he knew what she meant.

  Nathan saw the crack in Isaac’s resistance.

  “We’ve run corridor drills. Narrow thresholds. Zero-visibility cues. They responded every time.”

  “In the lab,” Isaac said. “Under supervision.”

  “Then supervise,” Nathan said. “Remotely. Directly. Whatever you need.”

  Howard rubbed his forehead.

  “Isaac… the protocols exist for a reason. But so does this moment.”

  The phone buzzed again.

  The operations chief, voice rasped:

  “We are losing air.”

  Isaac felt something hollow open in his chest.

  “We can hear them,” the chief said. “We know exactly where they are. But no human can get through the gap.”

  Nathan’s voice softened, for once without strategy.

  “Isaac,” he said. “They’re breathing now. They won’t be breathing much longer.”

  The room seemed smaller.

  The world, narrower.

  The distance between action and inaction almost nonexistent.

  Finally, the trapped workers’ radio crackled through the line — faint but unmistakably human:

  “If your machines can get through… send them.

  If they can’t… tell us now so we can— so our families know.”

  The last word dissolved in static.

  Isaac bowed his head, the protocols suddenly feeling very small in his hands.

  Julie’s hand found his, warm and unwavering.

  He looked up.

  “Prep them,” Isaac said hoarsely. “A-03, A-07, and A-12. I’ll write the field constraints.”

  Nathan didn’t smile.

  He just nodded.

  Howard exhaled, a sound caught between relief and dread.

  Emergency sirens from the operations floor rose and converged, a sound like the world rushing toward something it couldn’t avoid.