Well, we as audience members knew that, but the rebellious citizens of Silo 18 didn't have an inkling until the very end of the "Silo" Season 2 finale, "Into the Fire." And not so coincidentally, that's exactly where we leave Juliette and Bernard at the episode's conclusion.

Season 3 of the Apple TV+ hit will be based on Hugh Howey's second novel in the Wool trilogy, Shift, which goes back in time around 300 years to show what exactly happened when the silos were first built.