When a man named Tolbiac (Clovis Cornillac) awakens to find himself naked, disoriented and trapped somewhere deep underground, he begins an epic journey through a labyrinth of tunnels and dark caverns on his way toward the surface. Pursued by strange digital ghosts and other technological monsters, he uncovers clues to his predicament, which involves a scientific biosphere experiment gone awry. Franck Vestial directs this dark sci-fi thriller.