Been a while since I read them, and I don’t think it was magnetic reversal, but Silo series involves prolonged life in underground silos. https://en.m.wikiped

Been a while since I read them, and I don’t think it was magnetic reversal, but Silo series involves prolonged life in underground silos. https://en.m.wikipedia.org/wiki/Silo_(series) https://en.m.wikipedia.org/wiki/Silo_(series)