In the mid-2000s, a file titled began appearing on obscure P2P file-sharing networks and deep-web forums. Unlike the era’s typical "cursed" videos, it wasn't a jump-scare or a grainy snuff hoax. It was a 14-second clip of a dial-type combination safe sitting in a sun-drenched, wood-paneled room.

The video, uploaded in 2005, showed a room that hadn't been entered since the building was sealed in 1990. The mystery of isn't what is in the safe, but who was filming in a sealed room fifteen years after it was locked from the outside.

The video is unnervingly still. The only movement is a slight dust mote drifting through the light. However, the audio is a high-bitrate recording of someone whispering a string of coordinates and a date: October 12, 1994 . The Investigation

In 2012, a group of urban explorers tracked the coordinates to a derelict basement in a Chicago suburb. They found the exact room from the video—the wood paneling, the lighting, even the dust. But there was no safe. Instead, where the safe should have been, the floor had been neatly cut away to reveal a concrete pillar with the number etched into it in fresh ink.