Silo: What happened in season three, episode seven - 'Radio'?
Read a full recap of Silo's episode 'Radio'
Episode seven of Silo season three was released on Friday 14th August 2026. The episode was split between the Silo and the Before Times, as Lukas and Patrick go to the surface under the cover of darkness, while Helen and Daniel get to see work beginning on the Silo.
Throughout the season so far, viewers have had the opportunity to learn a lot more about why the silos were built. For a full recap of Silo season three check out our episode-by-episode guide.
Episode seven - 'Radio'
Juliette tells Patrick and Lukas that they’ve been chosen to go to Silo 17, and while they aren’t very happy about it, they accept, as Lukas wants to find out where the poison comes in. While Patrick says he’ll only agree if he can do whatever he wants after they get to Silo 17.
Robert realises that the Vitamin D+ is already in the water, and warns Juliette that it will take effect immediately telling her to drink anything except what comes out of the taps.
Covered by darkness, Lukas and Patrick enter the airlock and make their way to the surface, as the screens in the cafeteria are switched off. On the surface in the darkness, Lukas and Patrick are astounded when they see “nothing”, making their way towards the hill. As they approach the top of the hill their torch light travels across the remains of hundreds of bodies. Before long they hear buzzing, and using code ask ‘dispatch’ (Martha) about the noise, but their broadcast is cut short when gunfire is heard.
Camille is then called to The Vault, where The Algorithm tells her that Lukas and Patrick have been “neutralised”.
Meanwhile, in the Before Times, Helen and Daniel find themselves at a hangar, where Daniel’s sister Charlotte is, looking absolutely fine, along with Senator Rosalind Thurman, her daughter Anna Thurman, and several officials, including Per Stensen (Colin Hanks) – the richest man in the world.
Daniel and Helen are encouraged to sign an NDA to find out the world’s biggest secret, but the pair are reluctant. Charlotte reveals she has already signed the NDA because she wants to know "what the f—k happened to me", talking about her selective memory loss.
Daniel and Charlotte chat on the private jet, where she reveals she only remembers the facts about her mission and that it went bad, although Daniel doesn’t buy what his sister is telling him, revealing to Helen: “Well she gave me some s—t, so…”
Billings and Hank decide to meet up with Ed (in the Mines), who is Glenda’s dad, so they question him about Orla’s disappearance, but don’t get anywhere. Meanwhile, Knox catches up with Mark, where he finds out that his dad didn’t actually die in the Mines.
Bernard takes Juliette to meet someone he describes as having gone through something similar to Juliette, after being put on memory loss drugs. Mrs Hildebrandt knew George’s mother, and both were part of a secret group of citizens called The Flamekeepers.
Mrs Hildebrandt, holding the Mission Diary (named after a person called Mission), reads an excerpt from it, where Mission describes gradually forgetting his memories. Meanwhile, Juliette gets her hands on Judicial passes, thanks to Robert Sims’ help, but Camille suspects something and confronts her husband in the cell where she’s holding Amy (the nurse who helped Juliette).
Donny (from the Down Deep) and his team get into Judicial, and suit up, ready to set up the explosives, when suddenly Patrick’s voice cuts through on the radio from Silo 17.
In the Before Times, Helen looks out of the plane window asking where they are, with Daniel confirming they’re flying over Atlanta. As they land and transfer to a helicopter, Per reveals he’s bought 42 farms in Georgia, in exchange for generational wealth. From the helicopter Daniel and Helen get to see a giant digger, starting to make a hole for the silos.
What's happened in Silo season three so far?
Here's your chance to get up to speed on everything that's happened in Silo season three with our full recap.
Season three, episode one recap
Season three, episode two recap
Season three, episode three recap
Season three, episode four recap
Season three, episode five recap
Season three, episode six recap
Take a look through words and phrases that you might not know in Silo:
Going out to clean
Going out to clean in Silo its basically a death penalty. Residents of the Silo who go out to clean don't come back alive. They are sent out for two reasons, either because they break the law or they ask to go out voluntarily.
When they are outside, they clean the lens on a camera that displays on the screens in the cafeterias. Over time the lens gets covered in dust and debris from the toxic wasteland the residents of the Silo can see.
SPOILER! (Juliette is the only person so far to come back alive)
Up Top
The Silo consists of 144 levels, and they are connected by a single spiral staircase, there are no lifts. It is split into three main sections. Up Top is where the primary government offices, the Sheriff's station, and the surface airlock are situated.
The Mids
Below Up Top is The Mids, where many of the residents live along with the schools, and The Farm that grows food for the population. It also houses the Mids Medical, where Juliette's dad, a doctor, oversaw the nursery.
Down Deep
At the bottom of the Silo is the Down Deep. The people who live down there and keep the generator going rarely go up to The Mids or Up Top. There are many Deputy stations throughout the Silo, but the Down Deep Deputy Station is where Deputy Hank Murphy is charge. He is good friends with Juliette and Knox who work on the generator.
The Mines
Being sent to the mines is seen as a punishment for those who break the law. Iron ore was mined from The Mines, which are dirty and full of rats. Lukas Kyle is banished to The Mines for not reporting Juliette's relic.
The Digger Void
The area around the digger that was used to build the Silo is called The Digger Void. In the Digger Void is a camp made by George, where he hides a few relics, later Bernard is found hiding there, after many believed he had died.
Shadow
Someone's shadow is like their deputy, they are expected to learn from their mentor. In one of the early episodes Juliette gets a shadow called Terry Cooper. Juliette was previously Knox's Shadow, when she first transferred from The Mids.
The Algorithm
A select few from the Silo ever encounter The Algorithm, a voice that speaks to certain people about the Silo in a bright room with stepped walls. Although the subtitles call this voice The Algorithm it isn't referred to by the characters as such, and many don't know of its existence.
The Farm and 'going to the farm'
The Farm refers to the many farms in the Silo, where they grow crops and have animals such as pigs and chickens for the 10,000-strong population.
However, there's a slightly grim feature of The Farm, when members of the population die they can be buried in The Farm, so that their body's nutrients helps to feed the crops.
Before Times
Before the Silo was built was the Before Times - set in the near future (2040s). Not much is known about the Before Times in the first two seasons, with the third season beginning to explore why the Silo was created.
Judicial
Similar to the Sheriff, Judicial help to keep law and order in the Silo, they are responsible for enforcing The Pact and confiscating any relics.
Relic
Something from before the Rebellion. It's illegal to be in possession of a relic and knowing that someone has one and not reporting them can also be a punishable offence.
The Pact
The Pact is a book that the rules of the Silo are set out in. Several characters refer to The Pact throughout the series and how they must follow the rules.
The Rebellion
140 years before Silo is set there was a Rebellion when the residents of the Silo stormed the upper levels wanting to open the door to the surface and poison the entire Silo with air from outside. The Rebels burnt all the books, computer drives and anything from the Before Times.
Safeguard
A hidden pipe system which can flood the Silo with toxic gas. Use of it is designed to end the entire Silo's existence, but it isn't controlled by Silo 18, instead it is controlled by the overseers of Silo 1.