I can't truly spoil it, they treated the whole series like a fever dream. We spent the whole think collecting hints and details while they barely stayed consistent within their own canon.

There was this one scene fairly early on I think in the second season They had to leave this control center room and as the blast shields were coming down to permanently seal the room there was a giant black light drawing of the island and all kinds of glorious details of relays and switches and control centers. We froze the frame and extracted it and poured over it for weeks. They really didn't use any of it going forward.

I'm fairly certain they just made the story up as it went along trying to throw curve balls to anyone that would guess what was going to happen.

By the time it was done there was time travel, immortal beings and the afterlife all kind of just crammed together to make sure that no one could have seen exactly what was coming.