Mabel hung by a nylon thread over a hole that smelled like an old freezer and wet dog. This was her big comeback. She had a bag of stale jerky, a daughter who hadn’t spoken to her in a year, and a map that was mostly just a series of “maybe” lines drawn in Sharpie. Five years ago, Mabel was the top geologist at the university. Then she told everyone she found something breathing in a rock sample. They called her crazy, took her tenure, and her husband took the house. Now, she was three miles under the Antarctic ice sheet, trying not to wet her pants.
“If I fall and die,” Wren shouted from twenty feet above, her voice echoing off the frozen walls, “I’m telling Grandma it was your fault.”
“If you die, you won’t be telling anyone anything,” Mabel yelled back. Her arms felt like they were being pulled out of their sockets. “That is how death works, honey. Use your brain.”
Mabel’s deep wound wasn’t the loss of her job. It was the look on Wren’s face when the moving trucks arrived three years ago. It was a look of pure, cold shame. This trip was supposed to fix that. If they found the blue fungus, the “Glow,” they could save the world’s crops from the rot turning every farm to gray dust. Mabel would be a hero. Wren would have a mother who wasn’t a joke. But right now, they just had a lot of rope and a very dark hole.
The ice around them wasn’t white. Deep down here, it was a nasty, bruised purple. The air was so thin it felt like breathing through a straw. Mabel’s head throbbed. She looked down and saw a soft, flickering light. It wasn’t the steady glow of a flashlight. It was a pulse, like a heartbeat made of neon.
“I see it,” Mabel whispered. The fear in her chest shifted. It didn’t go away, it just grew teeth.
They hit the bottom of the shaft an hour later. The floor was soft. It felt like walking on damp sponges. When Mabel shined her light around, she didn’t see rocks. She saw mounds of thick, fuzzy blue moss. It covered everything. It looked like the world’s most dangerous shag carpet.
“Is that it?” Wren asked, unhooking her harness. She looked small in her heavy parka. Her nose was bright red, and she kept biting her lip. “The stuff that’s supposed to pay for my college?”
“That’s it,” Mabel said. She knelt down, her knees making a wet, squelching sound. “The Glow. It feeds on the cold. It eats things that shouldn’t be alive.”
Mabel pulled out a glass jar. As she reached for a clump of the blue fuzz, she noticed something. The fungus wasn’t just growing on the floor. It was growing over a shape. A long, thin shape. She brushed some of the blue hair away and felt her stomach drop into her boots.
It was a boot. An old leather boot, the kind explorers wore a hundred years ago. And inside the boot, there wasn’t a foot. There were just thick, pulsing blue roots.
“Mom,” Wren said. Her voice was flat. “Why is the carpet moving?”
Mabel looked up. The blue light was getting brighter. The mounds of fungus weren’t just sitting there. They were expanding and shrinking. It looked like a room full of lungs. The smell changed. It didn’t smell like a freezer anymore. It smelled like sugar and rotting meat.
“Don’t move,” Mabel said. Her heart was hammering against her ribs like a trapped bird.
“I’m moving,” Wren said, her voice shaking. “I’m moving right now. I’m going up.”
Wren grabbed her rope, but it wasn’t there. The blue fungus had climbed up the line while they were talking. It was thick and heavy, pulling the rope down from the ceiling like a slow, hungry snake. The rope didn’t look like rope anymore. It looked like a blue tentacle.
A wet, sliding sound came from the shadows. Mabel turned her flashlight toward the noise. The beam hit a wall of ice, but the ice was melting. Something was behind it. Something big. It looked like a person, but it was twice as tall and had too many joints. It was covered in the Glow. Its eyes were two circles of bright, humming blue.
The thing didn’t scream. It hissed. It sounded like air escaping a tire.
“Get behind me,” Mabel said. She reached into her pack and pulled out her rock hammer. It felt like a toothpick against a monster.
The blue creature stepped forward. Its feet made that same squelching sound. It wasn’t walking; it was sticking to the floor and pulling itself along. As it moved, pieces of blue fuzz drifted off it like dandelion seeds. Mabel watched one land on her glove. It didn’t just sit there. It started to burrow into the fabric. It was hot. It burned like a cigarette butt.
“It’s not a cure,” Mabel whispered. “It’s a parasite.”
The realization hit her like a punch. The plant rot on the surface wasn’t a disease. It was a dinner bell. This thing wanted to go up. It needed a ride.
The creature lunged. It was fast, a blur of blue light and wet hair. Mabel swung the hammer, catching it in what might have been a shoulder. The hammer stuck. The fungus grabbed the metal and started to eat it. The steel turned to orange rust in seconds.
“Run!” Mabel screamed.
They scrambled toward the wall. The ice was slick, covered in the melting slime of the fungus. Wren tried to climb, but her hands couldn’t find a grip. She was crying now, loud, jagged sobs that made Mabel’s chest ache.
“I can’t!” Wren yelled. “It’s too slippery!”
Mabel looked at the creature. It was standing between them and the only other rope. It was waiting. It didn’t have a mouth, but the fungus on its face was parting, revealing a hole filled with jagged, frozen teeth.
“Wren, look at me,” Mabel said. She grabbed her daughter’s shoulders. “I need you to use the ice screws. The ones in my side pocket. Use them as handholds. Don’t look back. Don’t look at it.”
“What about you?”
Mabel looked at the jar in her hand. Then she looked at the creature. She had spent her whole life trying to be right. She wanted the world to know she wasn’t crazy. But being right wasn’t worth much if her daughter ended up as a blue statue in a hole.
“I’m going to distract it,” Mabel said. She felt a strange, cold calm. “When you get twenty feet up, you drop the spare line. Not before. You hear me?”
“Mom, no.”
“Go!”
Mabel turned and threw the glass jar at the creature’s head. It shattered. The concentrated samples of the fungus inside splashed across the monster’s face. It recoiled, the blue light on its body flaring to a blinding white. It let out a sound like breaking glass.
Wren started to climb. She hammered the ice screws in with her bare hands, her fingernails bleeding, her face a mask of terror.
Mabel didn’t have a weapon anymore. She had her keys, a half-eaten granola bar, and a flare. She pulled the tab on the flare. Red fire hissed into the blue dark. The creature hated the heat. It backed away, its long, spindly arms twitching.
But the flare was short. It was a tiny candle in a very big, very cold room.
“I’m up!” Wren’s voice came from high above. “Mom, the rope is coming down!”
The blue monster recovered. It realized the red fire was small. It started to circle Mabel, its blue eyes pulsing faster. Every time Mabel moved the flare, the thing flinched, but it was getting closer. It was learning.
The rope hit the ground five feet away from Mabel.
She lunged for it. The creature lunged at the same time.
Mabel felt a sharp, cold sting in her calf. She looked down. A blue root had shot out from the creature’s hand and pierced her leg. It felt like liquid nitrogen was being pumped into her veins. Her leg went numb instantly.
“Mom!”
Mabel grabbed the rope. She tied herself in with shaking fingers. She couldn’t feel her foot. She looked at her leg and saw the blue fuzz already sprouting through her thermal pants. It was beautiful. It was horrifying.
“Pull!” Mabel screamed.
Wren pulled. The winch on the surface groaned. Mabel was yanked off the ground just as the creature’s teeth snapped inches from her boot.
As she rose into the dark, Mabel looked down. The creature wasn’t chasing her. It was standing there, watching. And it wasn’t alone. Dozens of blue lights were flickering in the shadows of the cave. The floor was moving. The whole cave was alive.
The ascent felt like a lifetime. The cold bit into her, but the spot on her leg was hot. It was a burning, itchy heat that was spreading toward her knee.
They reached the surface. The Antarctic wind hit them like a physical blow. The sun was a pale, weak coin in the sky. Wren pulled her mother over the edge of the hole and collapsed onto the snow, gasping for air.
“We have to go,” Mabel said. She tried to stand, but her leg buckled. She looked down. Her pants were torn.
Under the fabric, her skin was gone. In its place was a patch of bright, pulsing blue moss. It was growing. She could feel the tiny roots tickling her bone.
Wren stared at the leg. Her eyes went wide. She looked at the hole, then back at her mother. The silence between them was heavier than the ice.
“We have to tell them,” Wren whispered. “We have to tell them what’s down there.”
Mabel looked at the horizon. There was no one for five hundred miles. Just snow and wind. She looked at her leg again. The blue light was reflecting in her daughter’s eyes.
“No,” Mabel said. Her voice was thin. She felt a strange urge to smile. The pain was fading, replaced by a warm, fuzzy hum in her mind. “We don’t need to tell them, honey. It’s already here.”
She looked at her hand. A tiny blue hair was pushing its way out from under her thumbnail.
Mabel reached out and touched Wren’s cheek. Her fingers were very, very cold.
“Don’t worry,” Mabel said, and her voice sounded like two pieces of ice rubbing together. “It doesn’t hurt after a while.”