Hugh Howey, on whose books the show is based, was one of the first self-published authors (an author who is not signed by a traditional publishing house) who found success using the then-new Amazon Kindle format and manage to live solely from writing and self-publishing books.
Season 1 covers the first 30 chapters of the book "Wool" - the book has 82 chapters.
The three books in the Silo trilogy by Hugh Howey are called "Wool" (2011), "Shift" (2012), and "Dust" (2013). The title "Wool" refers to the material of the cloth that those being sent outside are given to clean.
AppleTV+ ordered season two on 14 June 2023.
The helmet for the suits in which those who are sent outside "to clean" are almost identical to the helmets used on the spacesuits in "2001: A Space Odyssey."