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FYI: The author wrote Wool as a stand-alone short story and published it with a small press. Afterward, he decided to self-publish it via Amazon’s Kindle Direct Publishing. From there the story gain popularity and the attention of publishers and ultimately Hollywood studios.
Here is the goodreads blurb of Wool:
Thousands of them have lived underground. They've lived there so long, there are only legends about people living anywhere else. Such a life requires rules. Strict rules. There are things that must not be discussed. Like going outside. Never mention you might like going outside.
Or you'll get what you wish for.
Source: TheHollywoodReporter.com