I’m with you. I definitely think there are more than 1 silos connected by tunnels that a group or organization or government has access to. I am not convinced that everything outside the silo is fine but I’m also skeptical that it’s poisonous/dangerous. The scenes we see of everything looking green look very suspicious for sure. A theory popped in my head last night that I’m 99.9% sure is wrong but it sounded cool. The silo(s) are not on Earth. Maybe the Moon. Maybe Mars. I don’t know.