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@qntm in "Unforgettable", El tells Marion that humanity has been looping "maybe for centuries". In "Immemorial", we learn that a large proof of this is right outside the window. Why would neither of them, both experienced researchers, know about it at this point in the timeline?
Marness doesn't know about SCP-9429. Wheeler knows that it's from hundreds of thousands of years ago, and SCP-9429-A is dead. Neither of them are aware of any kind of loop
