Every day thousands of people descend into the subway. One late evening, the last train speeds by the station and disappears into the dark tunnel along with the confused passengers. The authorities are informed and the mysterious incident is immediately classified top-secret. Several days later, a group of the lost passengers’ friends begin their own investigation. The underground tunnels have long been the stuff of blood-chilling urban legends, but the reality proves to be utterly unimaginable. The diggers will take the viewers to places they’ve never seen before and reveal what lies beneath our feet we go about our daily lives.