I must admit that the synopsis really grabbed me.
1975. Unable to return to Earth, the first Russian cosmonaut sent on a mission to the Moon is declared missing. However, through ghostly radio transmissions, he claims to having returned… and not finding a living soul on Earth. His unreal presence and voice will slowly destroy the world of his beloved ones.
It is also described as a Transmedia project with 30 webisodes, an alternate ending, a secret shortfilm, various books and more.