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Currently you are able to watch "B4" streaming on Freevee, Filmzie for free with ads or buy it as download on Apple TV, Amazon Video. It is also possible to rent "B4" on Amazon Video, Apple TV online
Three friends find themselves trapped in an underground parking garage. They soon discover it is no ordinary parking garage... with doorways leading into the past and future and floors that repeat themselves for eternity, their perceptions of time and space crumble around them and they must struggle to keep their sanity, if not their lives.