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Warning: This article contains spoilers for Silo Season 1.
Silo Season 1 begins with a question that hangs over almost every episode: what is really outside?
Thousands of people live in a vast underground structure known as the silo. As far as its residents have been told, the world beyond its walls is toxic and anyone who steps outside will die. The rules are strict, records of the past are limited, and objects from before the silo, known as relics, are forbidden.
Nobody is supposed to ask too many questions.
That begins to change with Sheriff Holston Becker and his wife, Allison.
Allison and Holston's deaths begin the mystery
Allison becomes suspicious of life inside the silo after meeting George Wilkins, a computer expert who has been looking into its hidden history. Her doubts deepen when she learns that the birth control system may not work the way residents have been told.
Allison eventually says she wants to go outside. Once a resident makes that declaration, it cannot be taken back.
She is sent out to clean the camera that gives the silo a view of the surface. Through her helmet, Allison appears to see a green landscape rather than the dead world shown on the cafeteria screen. She cleans the camera and then collapses.
Two years later, Holston also asks to go outside.
He sees the same beautiful landscape. But before dying, Holston removes his helmet and crawls towards Allison's body.
His death leaves the silo without a sheriff.
Juliette Nichols becomes sheriff
Before leaving, Holston recommends Juliette Nichols as his replacement.
Juliette works as an engineer in Mechanical, at the bottom of the silo. She is more comfortable repairing machines than dealing with the politics of the upper levels, but she has her own reason for investigating what is happening.
George Wilkins, the man Allison met, was also close to Juliette.
George is dead, and his death has been ruled a suicide. Juliette does not believe that explanation. She thinks he was murdered and uses her new position as sheriff to investigate.
Her search quickly leads her into parts of the silo's system that few residents understand.
George Wilkins and the hard drive
Before his death, George had been investigating an old hard drive. The device contains information from the silo's past and is considered an illegal relic.
The hard drive becomes central to Juliette's investigation.
As she follows George's trail, Juliette learns that the silo's authorities are hiding far more than she expected. Surveillance equipment is secretly monitoring residents, despite cameras being treated as technology from the old world.
Judicial also appears willing to arrest or kill people who get too close to certain information.
Juliette initially believes Robert Sims, a senior Judicial figure, is at the centre of the operation. Sims commands the raiders and plays a major role in tracking her movements.
But he is not the person with the most power.
Bernard Holland is revealed as the man in control
Bernard Holland, the head of IT and the silo's interim mayor, gradually emerges as the person overseeing the system behind the silo's secrets.
Juliette's investigation makes her a threat.
When she refuses to stop looking into George's death and the hard drive, Bernard and Sims move against her. Juliette is accused of crimes and becomes a fugitive inside the silo.
She escapes several attempts to capture her and continues searching the hard drive for answers.
One of the files changes everything.
What Juliette sees on the hard drive
Juliette finds footage recorded by a woman named Jane Carmody.
The video appears to show the outside world covered in green grass, trees and birds. It is completely different from the grey wasteland shown on the silo's cafeteria screens.
For Juliette, the footage seems to confirm that residents have been lied to.
She tries to broadcast the video across the silo so everyone can see it. The attempt briefly causes confusion, but Bernard's system stops the transmission.
Juliette is eventually captured.
Bernard then has her sent outside.
Before she leaves, he shows her footage connected to George's death. Juliette learns that George jumped to his death rather than allowing himself to be taken and tortured for information.
She is then prepared for cleaning.
Why Juliette survives outside
People sent outside usually die shortly after cleaning the camera.
Juliette is expected to suffer the same fate.
However, Martha Walker and Juliette's friends in Mechanical have already discovered an important detail involving the heat tape used on cleaning suits. The tape supplied by IT is poor quality.
Walker arranges for Juliette's suit to be sealed with better tape from Mechanical.
That difference appears to save her life.
When Juliette steps outside, she sees the same green landscape Allison and Holston saw. Birds fly across a blue sky, and the land around the silo looks alive.
But Juliette notices something familiar.
The birds are moving in exactly the same pattern as the birds in Jane Carmody's video.
She realises the beautiful landscape is not real.
The green world is a lie
The image shown inside Juliette's helmet is a display.
People sent outside are made to see an artificial version of the world. This explains why cleaners often wipe the camera. They believe they have discovered that the outside is safe and may think cleaning the lens will allow everyone inside to see what they can see.
But the cafeteria screen was not hiding a green world.
The wasteland is real, Juliette refuses to clean.
As she walks towards the hill, she reaches the bodies of Holston and Allison. The artificial image in her helmet hides them, but Juliette works out where they are.
She leaves Holston's sheriff badge behind and continues walking.
Bernard watches her progress and quickly realises that she knows the helmet display is false.
What does Juliette see at the end of Silo Season 1?
Juliette makes it farther than any cleaner the silo residents have watched before.
When she reaches the top of the hill, the artificial green image disappears.
The real world is revealed.
It is a dead wasteland.
But that is not the season's final surprise.
Juliette looks across the landscape and sees several other structures surrounding her. Her silo is not the only one. There are many silos spread across the area, each apparently built beneath the ground.
The people inside Juliette's silo have been living as though their underground home is the whole surviving world.
It isn't.
What the Silo Season 1 ending means
The ending answers one major question while creating several others.
The outside world really is dangerous, but the authorities are still lying to the people inside. The green landscape seen by cleaners is an artificial image, while information about other silos has been kept secret.
Bernard clearly knows more than most residents, although Season 1 does not fully explain how much he knows or who may be above him.
Juliette's survival also changes the situation. Instead of dying in front of the silo's camera, she walks beyond the hill and disappears from view.
Season 1 ends with Juliette outside, surrounded by a ruined world and faced with the discovery that her silo is only one of many.
The question is no longer simply whether the outside is safe.
It is who built the silos, why the truth has been hidden and what exists inside the others.