India, Aug. 14 -- The following article contains major spoilers from Silo Season 3 Episode 7, titled "Radio."

Silo Season 3 Episode 7 finally starts connecting the present-day story inside Silo 18 with the events that happened before the silos were built. While Juliette races to stop the Safeguard system, Camille moves ahead with her plan to use Vitamin D+ on the residents. Meanwhile, Helen and Daniel are taken closer to the heart of the mystery surrounding the silos.

The episode also delivers one of the season's biggest reveals yet: the 51 silos were being constructed as part of a massive, organised project before the world-ending event. That immediately raises a much bigger question - who planned them, and why?

What Happened In Silo ...