A low, heavy rumble filled the room.The needle on the gauge crept upward, then settled firmly into the green. Warmth flowed back through the pipes, spreading into every corner.Lights flickered on, one after another.In the corridors, people hugged each other, crying.Cheryl ran over, holding a small yellow flower, freshly grown in the greenhouse."Mr. McCarthy, this is for you."I took it from her, breathing in that faint, fragile scent of life.-The core hummed steady and strong. The shelter held at a stable 68 degrees.The seeds we brought back had already sprouted in the greenhouse.I stood over a hydroponic bed, watching the green shoots and logging their growth.Russell walked up and handed me a cup of water. "Zach, the first batch of fast-growing greens will be ready to harvest tomorrow."I nodded, taking a sip. "As long as the water circulation holds, we can double output."Then a sharp, piercing alarm cut through the greenhouse. Red warning lights flashed wildly
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