Marcus was a cartographer who preferred the company of silent maps to noisy people, which is why he volunteered to survey the unmapped slot canyons of northern Arizona. The silence there wasn’t empty; it was thick, ancient, and heavy.
On his third afternoon, he found a fissure in the limestone that wasn’t on any satellite grid. He squeezed through the narrow opening, his headlamp cutting through the pitch-black darkness, until the passage opened into a massive, cathedral-like subterranean cavern.
Fascinated by the scale, Marcus took a deep breath to test the acoustic properties of the cave. He shouted a single, loud word into the abyss: “Hello!”
He waited. Three seconds later, the echo bounced back off the distant stone walls, clear and crisp: “Hello!”
Smiling, Marcus turned back to his notebook to sketch the layout. But five seconds later, before he could speak again, a second sound rippled through the darkness. It was the distinct, wet sound of a heavy footstep, followed by a voice that mimicked his exactly, though the tone was mocking: “Hello?”
Marcus froze. The hairs on his arms stood on end. He didn’t move a muscle, breathing as silently as possible. He clicked his headlamp to high beam and swept the light across the jagged rocks. Nothing. Just shadows.
Then, the cave spoke again. This time, it wasn’t an echo of something he had said. It was a perfectly replicated voice—his own voice—but it spoke a sentence he hadn’t even thought of yet.
“I know you’re hiding in here,” his own voice echoed from the dark.
Panicking, Marcus dropped his notebook and scrambled back toward the narrow fissure. As he squeezed his body through the tight gap, he heard his own frantic footsteps echoing behind him, followed by a final, terrifying whisper right at the entrance: “Don’t look back.”