Hello folks- this is the Mushrooms Cave (30x35), a small cave with a bit of standing water and as you can see there's a bit of a fungus problem unfolding. Your quest is to get in there with a wet-dry vac and clear it up a bit and, when you're finished, run an extension cord in there and set up a dehumidifier.
Your alternate versions of this map are Enchanted and Subuded! I made these a few months back, so the palettes are a little different than my more recent Underdark maps, but I still think these are both vibes you can easily work with. Enjoy!