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Message: <blockquote data-quote="LordEntrails" data-source="post: 6950113" data-attributes="member: 6804070">I would look to mining references. Things like granite are hard, but brittle. So, I think, that means they make relatively good tunnels, but have to be reinforced regularly. Stone like slate is relatively soft, but has good single direction strength so support is less often. Sandstone would be very difficult to dig because of collapse. So maybe magical means with arched bricking or 100% planked.Dirt would need to be planked up, especially if there was any ground water. Brick would be used when the dirt removed was of a high enough clay content to allow the removed material to be turned into bricks. Works well for walls, but not ceilings as they would have to be arched, and then backfilled with dirt.Floors are normally going to be whatever the material is. They would only be given flagstones, brick or tile flooring as part of a significant upgrade/improvement as part of a living space for a (rich) civilized race. If the environment is wet, planking would be the easiest/cheapest solution and would be easy to raise a few inches to allow for drainage/pooling.Note, planking would only be likely when the entrance is near a wood source (forest).This link provides some interesting examples of stone types that are mined and could be used as as wall examples (though here they are for sculpting); <a href="https://zimsculpt.com/about/stone/" target="_blank">https://zimsculpt.com/about/stone/</a>This <a href="https://www.google.com/search?num=30&site=&source=hp&q=ancient+underground+tunnels&oq=ancient+underground+&gs_l=hp.3.1.0l10.3627.10295.0.12592.21.13.0.8.8.0.147.1304.9j4.13.0....0...1c.1.64.hp..0.20.1273.0..46j35i39k1j0i131k1j0i46k1j0i131i67k1j0i67k1j0i20k1.cZBQYPWflHw" target="_blank">Google Search</a> provides an interesting concept or inspiration for the Underdark.You may find Wikipedia helpful; <a href="https://en.wikipedia.org/wiki/Mining" target="_blank">https://en.wikipedia.org/wiki/Mining</a></blockquote>

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