Far from the ordered silence of the humanities building, in a remote corner of the American Midwest, an abandoned iron mine lay forgotten beneath a gray, indifferent sky.

The entrance was a gaping wound in the hillside, its rusted steel gates long since collapsed under decades of snow and neglect. Twisted rails protruded from the ground like broken ribs. The surrounding forest had begun to reclaim the site; pale birches and stubborn scrub pines pushed through cracked concrete, their roots prying apart the old loading platforms. A faded sign, half-buried in dead leaves, still bore the ghostly letters: “DANGER – NO TRESPASSING – U.S. Dept. of Energy, 1987.”

Inside, the air grew colder with every descending level. Water dripped ceaselessly from the ceiling, forming shallow, oily pools that reflected the occasional emergency light still flickering on backup generators. The walls were raw, jagged stone veined with rust-red mineral deposits. Old ventilation shafts whistled with a low, mournful wind that sounded disturbingly like breathing. Deeper still, the temperature dropped further; the humidity thickened until every surface glistened with condensation. The smell was overpowering — damp earth, metallic ore, and something sweeter, almost organic, like overripe fruit left to rot in the dark.

At the lowest accessible level, nearly three hundred meters underground, the mine opened into a vast artificial cavern that had clearly been expanded long after the original excavation. Here, hidden behind reinforced blast doors that still functioned with a soft hydraulic hiss, lay a clandestine laboratory.

The facility was eerily pristine.

Bright, cold LED panels bathed the space in sterile white light. The floor was polished concrete, the walls lined with seamless white panels and thick observation windows. A low, constant hum of ventilation and monitoring equipment filled the air. In the center of the main chamber stood a row of ten transparent containment cells, each a perfect cube of thick, reinforced acrylic, airtight and soundproofed from the outside.

Inside every cell was a woman.

They were of varying ethnicities — East Asian, Black, Caucasian — yet each shared the same slender, graceful build and an expression of profound, involuntary surrender. All were in their mid-to-late twenties. All were completely naked.

In the first cell, a young East Asian woman with straight black hair clinging to her sweat-slicked face knelt on the padded floor, back arched sharply. Her small breasts rose and fell rapidly; her nipples were painfully erect. Between her trembling thighs, a glistening trail ran down her inner legs. Her mouth was open in a silent, continuous moan, eyes half-lidded and unfocused. Every few seconds her hips jerked forward in helpless little spasms, as though something invisible yet insistent was moving deep inside her.

In the neighboring cell, a Black woman with dark, tightly coiled hair pressed her forehead against the transparent wall, palms flat against the acrylic. Her long legs shook violently; soft, guttural sounds escaped her throat as her abdomen contracted in rhythmic waves. A faint hexagonal pattern shimmered briefly across the skin of her lower belly before fading again.

Further down the row, a pale Caucasian woman with auburn hair lay on her back, knees drawn up and spread wide. Her body convulsed in slow, powerful waves. Tears streaked her flushed cheeks, yet the expression on her face was not purely one of pain — it was something far more complex: terror intertwined with devastating, unwilling pleasure.

Every woman exhibited the same symptoms: trembling limbs, flushed skin, involuntary pelvic contractions, and that unmistakable, rhythmic moaning that rose and fell like a distant, inhuman choir.

Outside the transparent cells, three researchers in crisp white lab coats stood observing with clinical detachment. Their faces were calm, almost reverent. One — a middle-aged man with wire-rimmed glasses — held a tablet, occasionally tapping notes. Another, a woman with short silver hair, monitored vital signs on a large wall screen. The third, younger and male, simply watched with folded arms, head slightly tilted as if appreciating a complex symphony.

“No auditory trigger today,” the silver-haired woman said quietly, her voice carrying clearly through the sterile chamber. “The signal appears to have entered a latency phase across all subjects. Yet the physiological response continues — stronger than yesterday, in fact.”

The man with the tablet nodded. “Subject Seven’s hormonal spikes are nearly identical to the Pioneer-derived frequency pattern. We’re seeing consistent uterine contractions at 0.7 Hz. The brood response is stabilizing.”

The younger researcher leaned closer to the acrylic wall of the East Asian woman’s cell. She had noticed him and turned her glassy eyes toward him, lips parting in another helpless moan. Her hand drifted downward, fingers pressing between her legs as if seeking relief that would never come.

“Remarkable,” he murmured. “They are all becoming… receptive. Even without direct stimulation. The entity no longer needs to force entry. It is teaching them to invite it.”

The silver-haired woman adjusted a dial on the console. Inside one cell, the Caucasian woman’s back suddenly bowed violently; a fresh gush of clear fluid spilled onto the padded floor as she cried out — a raw, broken sound that did not penetrate the soundproofing.

“Patience,” the older man said, voice perfectly level. “We are merely observers. The Brood God selects its own vessels. Our role is to document the process… and prepare the next generation of carriers.”

He glanced at a secondary monitor that displayed a live satellite feed of a quiet university campus somewhere in the Pacific Northwest. A small red dot pulsed steadily on the map — labeled simply “Subject Zero: C.L.”

“Subject Zero remains the most promising. Her psychological resistance is exceptionally high, which makes the eventual acceptance all the more valuable. When she finally calls to it herself… the resonance will be unprecedented.”

Inside the transparent cells, the women continued to tremble and moan in near-perfect synchrony. Their bodies, whether East Asian, Black, or Caucasian, had become living instruments — tuned to the same cosmic frequency that now whispered through Cassandra Lim’s bones half a continent away.

Deep in the abandoned mine, the dripping water kept time with their ragged breathing.

And somewhere far above, in the ordered world of libraries and lectures, the same silent song was beginning to find new listeners.

The young researcher remained standing in front of the transparent isolation chamber, his gaze never leaving the East Asian woman. She was curled up on the floor, her body twitching gently in waves with an invisible rhythm. Soft, suppressed moans escaped her throat. Her fingers unconsciously wandered between her legs, her face a mixture of pain and intoxicated ecstasy that made it hard to look away.

He finally turned his head and asked in a lowered voice to the middle-aged man beside him:

“Dr. Harlan, why… can a single sound cause such intense sensory and sexual reactions? What we’re observing isn’t just physiological stimulation. It feels more like the entire nervous system and reproductive system are being completely rewritten. They aren’t simply being ‘violated’ — they’re being induced to crave violation. This goes far beyond any known neurolinguistic or acoustic hypnosis techniques.”

Dr. Harlan — the middle-aged man wearing thin metal-frame glasses — did not answer immediately. He first placed his tablet on the control console, folded his hands in front of him, and let his eyes sweep across the row of transparent isolation chambers. The ten women were still trembling and gasping in perfect synchronization, as if controlled by the same invisible conductor’s baton.

When he spoke, his voice was steady and carried an academic calm, as though he were presenting a paper that had been repeatedly verified:

“This phenomenon was first discovered in 2019. That year, a geological survey team was conducting acoustic measurements in an older tunnel deeper inside this mine. They were originally only testing the stability of the mineral layers, but they accidentally recorded a persistent, anisotropic background static. The frequency was extremely low, right on the edge of infrasound — around 0.7 Hz.”

Dr. Harlan walked over to the large monitor screen and opened an old file. A blurry spectrogram appeared, its peaks displaying an eerie organic rhythm, like the pulse of some living thing.

“At first, no one paid much attention. Then one of the female technicians, after listening to the recording, began showing… inexplicable symptoms. She suddenly collapsed in her dorm, experiencing extremely intense orgasms with no external stimulation whatsoever. The next day, another male colleague exhibited similar symptoms, though in a different form — he began having powerful, uncontrollable reproductive urges, and kept seeing images of hives and countless tiny jointed limbs in his dreams.”

The silver-haired female researcher added from the side, her tone equally flat: “After we isolated the recording, we found that if any fertile woman listened to this frequency for more than forty-five seconds, her uterus would begin contracting on its own, vaginal secretions would increase noticeably, and faint hexagonal patterns would even appear temporarily under the skin of her lower abdomen. Men mostly experienced auditory hallucinations and compulsive protective behavior.”

Dr. Harlan nodded and continued:

“It took us three years to confirm that this wasn’t simple acoustic resonance or neurotoxicity. It was more like… a biological signal. A kind of ‘language’ that transcends species — even planets. It bypasses the cerebral cortex entirely and acts directly on the oldest parts of the limbic system and reproductive centers. It doesn’t just make people feel pleasure; it makes them ‘understand’ the meaning behind the pleasure — which is ‘acceptance’ and ‘gestation.’”

The young researcher furrowed his brow, his gaze returning to the women inside the chambers. Though their moans were blocked by the soundproof walls, it still felt as if a low-frequency vibration was somehow passing through the glass.

“Then… what do you think it is? An alien virus? Or some form of communication from a higher life form?”

Dr. Harlan remained silent for a moment. For the first time, a very subtle change appeared in his eyes — not fear, but something close to reverent awe.

“We call it the ‘Brood God,’ not because it is actually a god, but because its characteristics are far too close to the ‘gods of reproduction’ found in ancient myths. It has no fixed form — at least not one we’ve been able to capture yet. It resembles a collective consciousness, a superorganism composed of countless tiny individuals. It may have come from deep space. Those anomalous signals captured by the Pioneer probes in the 1970s were likely faint echoes of its ‘call’ at the edge of the solar system.”

He walked to the nearest isolation chamber and gently pressed his palm against the acrylic wall. Inside, the Black woman had her forehead pressed against the glass, meeting his gaze. In that instant, her pupils dilated slightly, revealing a faint honeycomb-like fractured pattern.

“What it seeks is not conquest, but ‘symbiosis.’ It looks for carriers with highly developed uteri and strong neural plasticity — young women like them. It first uses sound to open their bodies and minds, creating intense sexual desire and dependency, then gradually implants its own genes, consciousness, and even part of its structure into their reproductive systems. In the end, these carriers will no longer be ‘human,’ but ‘nests.’ Living incubators capable of breeding the next generation of the Brood.”

The young researcher frowned again, his eyes once more turning toward the women in the chambers.

“Then… after all these years, why haven’t we seen any actual births? If it’s so powerful, why hasn’t any test subject successfully gestated… its offspring?”

This time, the silver-haired female researcher spoke first. She adjusted a knob on the control console, her tone carrying a calm, almost philosophical speculation:

“Perhaps because none of them have been perfect yet. It wants to birth a perfect pioneer. A carrier with extremely high rationality, extremely strong willpower, and perfect reproductive conditions. Only when such a vessel actively ‘accepts’ will it trigger true initial reproduction. The other test subjects… are merely transitional, merely tests.”

The young researcher’s Adam’s apple bobbed slightly.

“Then… what about Cassandra Lim? Why was she chosen as Subject Zero?”

Dr. Harlan turned around, the corners of his mouth lifting into a very faint, almost cold smile.

“Because she is the hardest to break. Her rationality, her phenomenological training, her strict control over body and mind — all of these make her the perfect test subject. When a ‘container’ this solid willingly utters the word ‘Accept,’ the resonance at that moment will far surpass anything these already half-submissive carriers can achieve. It will be the true ‘first breeding,’ and also the most critical window for us to observe the entire process.”

He looked again at the steadily pulsing red dot on the monitor.

“Right now, she is in a critical period of silence. The sound has temporarily withdrawn precisely to force her to make the choice herself. When she finally can’t resist and calls out to it… we will witness the first step of the Brood God truly ‘being born’ on Earth.”

The low-frequency hum inside the laboratory seemed to grow slightly stronger.

Inside the transparent isolation chambers, all ten women let out a long, trembling moan in unison, as if responding to some distant and immense will.

Thousands of kilometers away on campus, Cassandra Lim was curled up in Grace’s arms, staring at the dark ceiling. The silver cross necklace at her neck felt faintly warm.

She still had no idea that the silent call was slowly taking shape in a deeper, darker place, in a way she had never imagined.

At the same time, in the old district of Tainan, beneath an old apartment building.

Damian Thorne stood at the edge of the dim glow of a streetlamp, the collar of his black coat turned up, covering half his face. He looked up at the window on the third floor where a faint light was on — Cassandra Lim’s residence. The night wind blew past, carrying the faint dampness of rain and the distant clamor of the night market.

He did not step forward immediately. He simply stood there quietly, holding a printed copy of the paper draft in his hand, his fingertips gently rubbing the surface of the paper.

That tiny crack seemed to have crawled out from the text and extended into reality.

Damian’s gray eyes appeared exceptionally calm in the darkness, yet carried an undeniable weight.

He took a step forward and walked toward the apartment entrance.

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To be continued…