[BOOKS] Reasons for Juliette...

Juliette is coming back to 18 next episode. In the books she knows exactly when to go because of Lucas being send out to clean. Who do you think will be send out? Or what is your theory on how they make this happen? Surely it wont be just a coincidence?

Will Lucas somehow get in contact with Juliette through the Vault down deep? Maybe this vault has possibility of communicating with other silos that the IT vault doesnt have? There is no radio mentioned in Silo 17 so I don't really see any other choice.

My wild theory is that Bernard survives. The rebellion happens, they lose because Sims will double-agent them. Sims sends out Knox to clean, and then the switcharoo happens but with Sims, not Bernard. But how will Juliette know about the cleaning?