Consciousness didn't return to Mateo with a jolt. It was a slow, agonizing rise from bck, viscous water. First came his hearing: a high-pitched, drilling ring, like the whine of a tightened string about to snap. Then, his lungs struggled to pull in the local atmosphere—heavy, oppressive, sparking with static electricity. It left a damp, bitter dust on his tongue that made his jaw muscles cramp instantly.

  Mateo opened his eyes. The darkness was thick, almost physical. He moved. His fingers sank into something soft and springy. Fumbling at his belt, he found his industrial fshlight—a miracle it had survived—and flicked the heavy toggle. The beam sliced through the thick haze. It wasn't dust. It was spores. Billions of microscopic particles shimmering in the light like a stelr nebu. They hung motionless, reacting only to the heat of his breath.

  — “Leo?” Mateo’s voice sounded muffled, as if the walls themselves were swallowing the sound, refusing to let it echo.

  — “I’m here, Dad.”

  The beam swung to the side. Leo was sitting ten feet away, half-buried in the gray, spongy moss covering the floor. Nearby, Cobra sat clutching her head. Nico y a bit further off, cursing under his breath and cradling a bruised arm. Everyone was alive. The "Throat" had delivered them gently.

  Mateo struggled to his feet. His legs shook; his vestibur system was in revolt, refusing to accept the new geometry. He aimed the light at his feet and froze. They weren't in a cave. And they weren't in a subway tunnel. They stood on a small horizontal ledge of a colossal pipe with a perfect circur cross-section. A few yards away, it sloped down into the darkness at a steep angle.

  The walls weren't made of brick or poured concrete. It was a bck, glossy substance, resembling obsidian or the chitin of a gargantuan insect. Complex geometric patterns of reinforcement ribs ran across the entire surface.

  The space felt ancient, terrifying in its scale. It looked like a giant, abandoned station of eternity, where the trains had long since rotted away, leaving behind only the cold longing of infinite tracks and the hollow echo of a dead era.

  Mateo pushed past his animal fear, pulled off a glove, and pressed his bare palm against the bck surface. It vibrated subtly against his skin. In his brain—accustomed to thinking in categories of structural mechanics and geology—a tectonic shift occurred.

  — “This isn't erosion,” he whispered, feeling cold sweat crawl between his shoulder bdes. “And it’s not tectonics. Look at the structure. No seams. No tool marks. These ribs... they weren't built. They grew.”

  — “Are we dead?” Nico asked hoarsely. The kid from the streets of Vil 31, used to police raids and knife fights, was now trembling with a fine, uncontrolble shiver. “Qué carajo... Is this Hell, posta?”

  — “At least Hell is warm,” Cobra snapped, hugging herself, though her voice betrayed her. “It’s just some secret government b. Right, Engineer?”

  — “No,” Mateo replied, gncing at the barometer on his watch. The needle was buried deep in the red zone. “It’s just very deep. I suspect we are inside a giant organism that our civilization mistakes for the Earth's crust.”

  From the darkness further up the slope came a wet, bubbling wheeze and the sound of something heavy dragging across the floor. Mateo’s fshlight caught a figure. Commissioner Vargas. He looked pathetic. His beige trench coat was reduced to filthy rags. His right leg was twisted at an unnatural angle—a compound fracture. A white shard of bone protruded from his pant leg, but there was strangely little blood. It was clotting almost instantly, turning into a thick, sticky resin.

  Vargas crawled down, leaving a wide, wet trail behind him. In his right hand, he held his chrome revolver in a death grip. Killer instinct proved stronger than traumatic shock.

  — “Ricci...” he hissed. The commissioner’s eyes were wide, his pupils narrowed to sharp points. There was no reason in them, only the agony and spite of a cornered beast. “You’ll pay...”

  He tried to lift the heavy barrel. His hand shook, the muzzle dancing, aiming now at Mateo, now at Leo’s chest.

  — “Don't do it, Vargas!” the teenager yelled, stepping forward. “Put the gun down!”

  — “Shut up, brat,” Vargas snarled, baring blood-stained teeth. “I am the w here.”

  He pulled the trigger. Click. A misfire. The cylinder had jammed tight from the impact of the fall. Vargas growled, trying to cock the hammer with his other hand. His face distorted into a mask of pure, distilled aggression.

  And the world around them reacted. Mateo saw it first.

  The floor beneath Vargas—that same soft gray moss—suddenly came to life. Like a disturbed colony of sea anemones on the ocean floor, bck, glistening tendrils shed out from the gray mass. This wasn't the attack of a hungry predator. It was the reaction of a defensive immune system. Dispassionate, lightning-fast, and surgically precise.

  — “Vargas, freeze!” Mateo screamed. “It senses a threat! Don't move!”

  But it was too te. The bck ribbons, looking like high-voltage cables, whipped around Vargas’s healthy leg, cinched his torso, and bound his gun hand tight. The commissioner screamed wildly, but the cry was cut short when a thick tendril, sharp at the end, plunged into his neck just below the ear.

  The transformation was slow, agonizing, and frighteningly aesthetic. The bck substance pulsed, pumping a dark, heavy fluid into the commissioner’s veins under pressure. Mateo watched in horror as the vessels beneath Vargas’s skin swelled and bckened, forming a dense geometric web. The commissioner’s ribcage arched convulsively, snapping ribs from the inside with a wet crack—they were rearranging, fitting into a new form. The broken leg bone spun a hundred and eighty degrees in the socket with a sickening crunch and snapped into pce, immediately entwined by bck fibers that hardened before their eyes into a glossy shell.

  — “La puta madre... It’s eating him!” Nico shrieked, pressing his back against the wall, losing the st of his street-tough act. Cobra simply covered her mouth with both hands, her eyes wide with terror.

  — “No,” Leo said quietly, his voice carrying a frightening, synthetic echo. “It isn't eating. It’s... fixing him. Assimiting. The organism doesn't tolerate foreign bodies. Either destroy it or make it part of yourself. He is an Antibody now.”

  Mateo ran to the hanging body and kicked the revolver out of the graying, graphite-turning hand. The tendrils didn't touch the engineer—there was no aggression in him, only pure, animal fear.

  — “Let’s get out of here,” Mateo barked, stepping back. “Before it decides to 'fix' us too.”

  — “Where?!” Nico cried hysterically. “Up is too slippery, down is total darkness!”

  Leo approached the wall. His movements had become fluid, somnambulistic.

  — “Leo, don't touch anything!” his father barked.

  But the teenager didn't listen. He wiped his dirty palm on his jeans and gently touched the bck gloss. In that same instant, the glowing veins deep within the obsidian shivered and lunged hungrily toward the point of contact.

  The bck material beneath the boy's hand cleared, becoming transparent as quartz. Deep within the wall, a complex fractal pattern fred—a manda of pure light. Leo exhaled sharply. His pupils dited, completely flooding his iris with pitch bckness.

  — “Do you hear it?” he whispered into the void.

  — “Hear what, son?” Mateo stepped toward him cautiously, afraid to touch him.

  — “The information.” Leo didn't pull his palm from the smooth chitin. “This isn't just a wall, Dad. It’s memory. Millions of years of memory. I see oceans boiling before the rock cooled. I see colossal mechanisms sleeping in the magma. An alien sky. The consteltions are shifted. Time flows both ways...”

  The veins in Leo’s arm, from his fingertips to his wrist, began to darken rapidly, perfectly mimicking the pattern on the wall. A direct neural interface. Symbiosis.

  — “Leo!” Mateo grabbed his son by the shoulders and yanked him away from the wall with all his strength.

  The contact broke with a dry snap of static electricity. Leo staggered, blinking rapidly. The bckness in his eyes slowly receded, returning to the boundaries of his pupils. He looked at his hand. His fingertips remained bck, like ingrained ink.

  — “Are you okay?!” Mateo shook him roughly.

  — “I know where the exit is,” the boy’s voice trembled from the strain. “We need to go up one level. Into the old storm drain. There’s a passage there.”

  Suddenly, the teenager’s face contorted into a look of pure, childlike confusion. He looked at his father.

  — “Dad... what was my first teacher's name? In elementary school?”

  Mateo froze. A chill gripped his heart tighter than the sight of the mutited commissioner.

  — “Se?ora Maria. You loved her. You used to draw Christmas cards for her.”

  — “I don't remember,” Leo looked at his bckened hand with mounting horror. “I see her face, her smile... but the name... it’s gone. There’s absolute emptiness there.” He raised a desperate gaze to his father. “You have to pay with memory for the map, Dad. The Substrate gives nothing for free. I traded Maria’s name for the route.”

  Mateo pulled his son into a tight, bone-crushing embrace.

  — “Don't you ever do that again. Do you hear me? We’ll find the way on our own feet. I won't let you erase yourself.”

  Leo nodded, buried in his father’s shoulder. Но Mateo saw out of the corner of his eye how his son’s gaze, despite his will, slid back toward the glowing wall with the hunger of a starving man.

  — “Dale, let’s go!” Cobra commanded sharply, grabbing a fshlight from the floor. “That thing is moving!”

  The bck cocoon behind them crackled obscenely. The graphite ptes of Vargas’s new, reconstructed exoskeleton began to unfurl with the sound of crumpling metal. The creature inside opened its bck, absolutely empty eyes.