After the slow pace that led to major cliffhangers in Silo season 2, season 3 finally pushed the plot forward in meaningful ways. Season 3 follows two plot timelines. In the main or current timeline, we follow Juliette (Rebecca Ferguson) in the aftermath of returning to her main silo after visiting silo 17. She learns about the rebellion that occurred in silo 17 and about the silo's ability to dispense poison to kill its inhabitants. When she returns to her home silo 18, however, she has her memory wiped at the direction of Camille in IT and the "AI Supercomputer" running the silo. As the season progresses, Juliette slowly regains her memory, and more importantly Bernard (Tim Robbins) realizes that the "AI Supercomputer" is actually just a human, likely located in Silo 1.
The second timeline follows a US Senator who has a sister that is a pilot for the military. She's involved in an incident in Iran where her plane crashes and her memory is wiped (sounds a bit like what happened to Juliette's memory). Her senator brother becomes interested in what happens and starts a personal investigation. He crosses paths with a reporter who is also interested in what happened (Jessica Henwick). As the season progresses, their poking around attracts the attention of those building the Silos. They are asked to join the Silo project, but decline. However, they accept an invitation to tour the Silos. As they enter the silos to begin the tour, the bomb is dropped annihilating the surrounding area. The creators of the Silo either knew the bomb was going to be dropped, or were themselves responsible for the bomb being dropped.
As the current and past timelines merge, it is confirmed that the voice behind the "AI Supercomputer" is a human, as Bernard suspects. The voice turns out to be the Doctor who treated the senator's wife after the Iran incident by wiping her memory, and occasionally the Senator himself voices the computer. What we don't know is the reason for the bomb. We now know why people are in the silos, but what we don't know is the motivation behind them or why they are hellbent on keeping people in the silos. I'm sure we will learn more about this in the fourth and final season. After the reveal that the people who built the Silos are (likely) responsible for the bomb, it is hard not to compare this to Fallout. I think the big difference is that people roam outside of the Vaults in Fallout, whereas they are being forced to stay in the silos in Silo. But the general concept feels very similar.













