The World Of Silo Explained

Summary The Silo in the Apple TV+ series is likely located underground in the continental United States, although its exact location is not specified.

The outside world in Silo is a deadly wasteland, with toxic air that can suffocate and kill humans, even with protective suits.

The Silo is an enormous structure, as tall as four Empire State Buildings stacked on top of each other, with 144 levels that stretch over a mile deep into the Earth.

WARNING: The following contains MAJOR SPOILERS for Wool and other Silo trilogy booksThe Apple TV+ sci-fi drama Silo series explained a complicated world author Hugh Howey created through his acclaimed series of novels. Wool, the first part of the Silo book series, was written and self-published as an e-book by Howey in 2011, twelve years before the Apple TV adaptation debuted in 2023. Howey later released Shift and Dust in 2013 as extensions of the Silo universe. Apple's Silo is based on the entire book trilogy, with at least one future season already confirmed to delve deeper into the later books. Accordingly, Silo involves complex and detailed world-building that demands further explanation.

Silo tells the story of a community that lives underground in a vertical safe haven due to the poisonous conditions of the outside world. The inhabitants of the silo believe an apocalyptic event centuries ago makes life on the surface impossible. The series stars Rebecca Ferguson as Juliette, who takes over as Sheriff after Sheriff Holston decides to leave the silo to learn the truth about the outside world. While the series hasn't revealed much information about the function and creation of the silo, the truth can be found within the Silo book trilogy for those who can't wait.

Related Silo Season 2: Renewal, Cast, Story & Everything We Know Apple TV Plus has renewed Silo for season 2. Here’s everything we know about what's next, from story details to which actors could return.

Where Is The Silo?

The Specific Location Of The Silo Is A Mystery

Based on the information provided in the Silo books, the silo is likely located underground somewhere in the continental United States. This can also be deduced by the English-speaking actors with American accents in the Apple TV+ series. The exact location of the silo is not specified in the books, but the Westernized themes of the underground society point to the implication that the silo takes place on what was formerly the territory of the United States before the apocalypse.

Although it's not stated that Silo takes place in the US, this seems like the most accurate prediction. There are 50 silos in total according to the second arc of stories in the Silo books, titled Shift. It's established that Silo 1 is Georgia, which further suggests that Juliette's silo is in the United States.

What's Outside The Silo?

The Surface World In Silo Is A Deadly Wasteland

The inhabitants are made to believe that the world outside the silo is deadly and poisonous, which is true. When workers are sent out to clean the camera at the silo's surface, they are only able to survive for a few moments before ultimately suffocating and dying from the poisonous air. This is because the suits that are meant to protect them from hazardous toxins do not protect them at all, meaning even those who keep their suits on aren't safe from the toxic fumes.

Both Holston's and Allison's visors on their suits were manipulated to show them a pleasant, verdant outside world, but this was a deception.

The world of Silo is also truly hostile and post-apocalyptic as it is shown through the main surface-level camera. Both Holston's and Allison's visors on their suits were manipulated to show them a pleasant, verdant outside world, but this was a deception. Holston believed that Allison was right in thinking that the world wasn't really poisoned and that a beautiful landscape awaited them above. Once he took the helmet off, Holston realizes that they had not been lied to and that leaving the silo was a grave mistake.

How Big Is The Silo?

The Silo Is As Large As Four Empire State Buildings

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The entire height of the silo is roughly 5,760 feet, which is equivalent to four Empire State Buildings stacked on top of each other. The social class systems within the silo are so distinctly divided due to the great distance that the bottom-level inhabitants would have to climb to reach the upper levels.

The walk would be especially tiring due to the incline and the number of stairs one would have to traverse. The lack of an elevator in the massive structure implies that the separation was deliberately designed to maintain a distinct caste system within the silo between the mechanical workers at the bottom and the authorities at the top.

Related Silo: The Syndrome Illness & Potential Cause Explained Although Silo has not yet explicitly explained what The Syndrome is, it has dropped several clues to hint at its primary symptoms and potential cause.

How Many Floors Are There In The Silo?

The Last Surviving Humans Have Over 100 Levels Of Living Space

The silo extends approximately more than a mile deep into the Earth with 144 levels that are each 40 feet tall. The Apple TV+ series kept the same dimensions as the original silo in the book to capture the immense size of the underground civilization. While some, including Mayor Ruth in Silo episode 3, may choose to make the trek up or down the silo by foot, it is typically only done on the rarest or most urgent of occasions. While it's possible to walk the full length, it would likelybe exhausting.

Who Created The Silo?

The Silo Exists Because Of A 2049 US Government Project

The reveal of who created the silo isn't discussed until the second book Dust, which explains that a multitude of silos were ordered to be constructed by the United States federal government in the event of a catastrophic attack that risks the future of humanity. Dust states that in the year 2049, Congressman Donald Keene is appointed to create the first-ever silo due to his expertise in architectural design.

Donald completes the project in 2052 by crafting an underground shelter system that consists of 50 individual silos.

Donald completes the project in 2052 by crafting an underground shelter system that consists of 50 individual silos. That same year, nuclear explosions took place on Earth which made the world uninhabitable.

What Happens When Citizens Leave The Silo

All That Awaits Outside The Silo Is Death

All that was known about leaving the silo was that people would ultimately die due to the poisonous air. Juliette becomes the first person who successfully manipulates her suit and goes to the surface with the necessary protection to explore the post-apocalyptic wasteland. Juliette soon discovers through her travels that there is more than just one silo. There are at least 18 different silos all at various levels of civilization. The Apple series will likely unfold the events that bring Juliette to Silo 17, where she breaks in and finds out about an uprising that ended terribly for the inhabitants.

So far the show has stayed true to the plot of source material.

Hugh Howey's books Wool, as well as Dust and Shift, so far seem to possess the exact blueprint of how the Apple TV+ series Silo will play out. Although there is a possibility that the creator of the television series Graham Yost could change some key elements of the book trilogy, so far the show has stayed true to the plot of source material. Howey has reportedly been very pleased with the television adaptation of his celebrated Silo books and will likely play a major part in the development of the next season and perhaps even a season 3 sometime in the near future.

Aspects Of The World Of Silo Still To Debut

Silo Season 2 Still Has Plenty Of The World To Explore

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While Silo season 1 introduced the vast and complex post-apocalyptic dystopia created by Hugh Howey, there are still plenty of aspects of the world that the show must introduce. The second book in the series, Shift, is a prequel to Wool (upon which season 1 is based). This means that future seasons of the show will include many more details about the history of the world and how humanity found itself living in underground silos, and how the silos themselves were created.

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A key element of the world of Silo to be introduced is nanobots. In the source material, the nuclear war was a response to the emergence of weaponized self-replicating nanotechnology. Without giving away too many spoilers, nuclear annihilation was seen as the lesser of two evils in comparison to the alternate nanotech-based armageddon humanity nearly faced. The key reveals, however, are less to do with the world and more to do with its history, since everything from humanity's future to the creation of the silos is steeped in intrigue and conspiracy by the time the original Silo books conclude.