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It's not necessary for them to be only underground. And it's not necessary to change the background.
This won't give much, except for problems with reworking.
Imagine your Belarus underground... Every day, looking out the window or leaving your house, you would only see a dungeon and never see sunlight or the surface you are so used to... You would say you want to go back to the surface, and I would say - but what's the difference, it's all the same here and there. It won't give much, and moving you to the surface would be a big hassle...
That's how I feel after reading your post...
Происходящее-просто игра отражений, рябь мыслей, которую гонят привычные сквозняки ума.