Humming softly, the air filtration unit cycled above Elara's head. She stood before a vast, crystalline wall, peering into the biodome designated Sector 4B. Lush greenery stretched before her, a stark contrast to the sterile corridors outside. Her breath hitched. Observing the first row of Oxygen-producing algae vats, she noted their vibrant emerald sheen. Sunlight streamed through the dome's reinforced glass, bathing the entire section in a warm, artificial glow. Her tablet glowed with baseline environmental data. A low thrum vibrated beneath her boots. Julian’s command center was just on the other side of this very wall. She felt his presence, a constant pressure, even when unseen. Adjusting the magnification on her handheld scanner, Elara focused on a cluster of Pneuma Vines. Their broad leaves, usually a deep forest green, showed subtle discoloration. A faint, almost imperceptible yellow bled from the edges inward. Concern tightened her grip on the device. This wasn't typical senescence. These plants were robust, genetically engineered for resilience within the station's closed ecosystem. Moving slowly along the observation deck, she scanned more closely. Isolated patches of leaves, usually vibrant, now displayed a dull, almost bruised appearance. A few Pneuma Vines had shriveled tips, brittle to the touch. Her internal alarms began to clang. This wasn't isolated damage. It was systemic, quiet, insidious. The tell-tale signs were too familiar, too precise. Reaching a larger specimen, a towering Arboris Fern, Elara pressed her scanner against a yellowing frond. The device beeped, transmitting data. Cellular necrosis, unevenly distributed, yet spreading. Every data point echoed a nightmare she’d tried to bury. The patterns, the localized decay, the way it mimicked a nutrient deficiency yet clearly wasn't. It was the exact signature. Years ago, her groundbreaking research on accelerated plant decay, mislabeled as bioweaponry, had shattered her career. This was it. The very phenomenon that had disgraced her, playing out again, right here, on a critical life-support system. A cold dread seeped into her bones. If this was what she thought it was, the station was in grave danger. Oxygen production would plummet, slowly, agonizingly, until it was too late. She remembered the scorn, the accusations. “Dr. Vance’s reckless theories,” they’d called it. “A dangerous obsession.” How could she bring this up now, given her past? Ignoring the gnawing anxiety, Elara intensified her observation. She needed proof. Undeniable, irrefutable evidence. Her fingers flew across the tablet’s interface, pulling up historical growth data, comparing it to current spectral analysis. Scanning deeper into the root systems, she looked for fungal growths, bacterial infections. Nothing obvious. Yet the decay persisted, accelerating in areas she’d marked just an hour ago. Her breath grew shallow. This wasn’t a simple environmental fluctuation. This was targeted, or perhaps a virulent, unknown pathogen. But the *pattern*… it was so distinctively hers. It was the way the chloroplasts broke down, the specific enzymes implicated, the cascade failure of the cellular structure. She had identified it first. Isolated it. Tried to warn them. Julian Thorne’s face flashed in her mind. He was meticulous, ruthless. He wouldn’t tolerate failure, especially not a cover-up. But revealing her past now felt like professional suicide. Even so, the survival of everyone aboard depended on her. She had to push past her fear. The plants were dying, slowly but surely, right under their noses. Elara pulled up microscopic imaging, focusing on individual plant cells. Her eyes strained, searching for the anomalous structures she’d documented in her forbidden research. Could it be? Concentration consumed her. The tiny, cellular world unfolded on her screen, revealing its secrets. She saw it. A faint, crystalline deposit, disrupting the cellular membrane. Unique. Impossible. Her hand trembled, zooming further. This was the same crystalline disruption she’d found in her isolated samples. The very thing that had been dismissed as a lab anomaly. Leaning closer to the crystalline wall, Elara felt a surge of cold recognition, mixed with a chilling sense of vindication and terror. The power drain, the failing life support… was *this* the cause? Or a symptom of something far worse? She ran a rapid sequence scan, mapping the spread of the cellular disruption across the entire plant cluster. The results were undeniable. It was spreading, exponentially. A voice, sharp and precise, cut through her intense focus. Julian Thorne stood directly beside her, his proximity unexpected, his scent of ozone and something subtly metallic filling her senses. His gaze, cold and unwavering, bore into her. “What exactly are you looking for, Dr. Vance?” he demanded, his tone leaving no room for evasion.

Chapter 7: Haunted by Echoes