Wow, I am glad this was looking at by devs. Hoping its a feature in the full game.

Yes a bunker system would just be man made caves. But in a real life scenario like Afghanistan insurgents did stay in the caves in the mountains but Stratis is based in Greece and since it is in the future its a fairly rich country today so people wouldnt be living in caves.

Caves would we kind of stupid because caves are usually uninhabited so why would you need one to walk through? My post on a bunker system would be suited for the game since the bunker doors are already set up.

Well what I mean is a system of connected bunkers in general. They should be a way of opening them without being cheesy like opening a regular door but they should make it where they could open or be blown into.