La hora fría

In a desolate future, eight survivors of an apocalyptic war live in a crumbling underground facility, constantly threatened by contaminated mutants and ghostly apparitions known as The Invisibles, who emerge during the "Dark Hour" to wreak havoc. Their only defense is to cut off power and heat, but this comes at the cost of their fragile mental states. As supplies dwindle, the group must venture out into the unknown, braving not only the external dangers but also their own dark pasts, and ultimately discover the shocking truth about their confinement.