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.
I'm impressed! Well-written and thought-provoking. It's not long-- just a short novella / long short story-- so if you enjoy reading about dystopian futures, definitely give this a try. (The Kindle version is currently available for free on Amazon.) This is the first in a series (not sure if the other installments are so short...), and I'll definitely be reading at least the next one (Wool 2 - Proper Gauge).
It might not be for everyone (can't go into details without spoiling it). Heck, it might not even be for me on some occasions, but for today, it was good.