Barbarian: Who Built The Tunnels (& How Long Were They There?)

Warning! SPOILERS for BarbarianMuch of Barbarian's storyline unfolds in a labyrinth of terrifying underground tunnels, though the movie keeps the origins of this setting shrouded in mystery. The first half of the movie presents a series of red herrings in which it is hard not to wonder whether Bill Skarsgård's Barbarian character, Keith, is a kind stranger for letting Tess stay for the night or a man with sinister, ulterior motives. However, when Tess discovers a secret room in the rental's basement and a long stretch of tunnels connected to it, it becomes evident that Keith is nowhere close to being Barbarian's antagonist, and that more chilling dangers await Tess in the rental from hell.