I'm creating a world in outer space. The people live in a box-like structure because outside the planet is uninhabitable. In this box, the houses are built in rows of two or three with 5 columns, in a grid-like structure. On the paths between the houses there are plants and some trees (mainly flowers, I'm not sure which ones yet). The government rules over most of their world, but there is a resistance based in a lone house outside the grid of the other houses and which is trying to gain control. The government wants to block all connection to the resistance, but I need the resistance to have ways to cross in undetected, as hard as it may be. There isn't much space to hide because it's all houses and very low plants. What sort of border would accomplish that? I'm open to border placement ideas, border material, ways for the resistance to camouflage themselves into the government's area or anything really as long as it doesn't require an extreme amount of a hard to transport resource.
Their box is only the top box.
People have been living in this protected box for a very long time. The government has adjusted the history of its people to meet its needs and so the citizenry is not generally aware of what is beneath them.
It is not easy to get down there, but below the boxes are the boxes and living spaces of previous civilizations, all the way down to the first people who built the original enclosure to protect them all. Other things they find down there might be useful to advance your plot.
Once you are down there you can move about unseen. Coming back to the surface might pose its own challenges.
An interesting question: what if what is below them is not just ruins? Could the lower levels still be inhabited? And is it possible that their own box is not actually the top box and there are others above them? How big is their world, exactly?