Medyan
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I don't see any problems. Underground, you can create several separate areas, design one as a regular dungeon, another as halls of dwarves, on the third, you can have grass and trees, and on the fourth, water (and so on). When transitioning from one area to another, you can change the lighting to enhance the feeling that you are entering a different place (although I haven't done this myself yet, the script function exists, so...).
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