Like @Buugi said Sorissi has a lot of nice cave systems. My main base uses some and my vault I’m building is in a cave system. Eventually going to plot from one to the other
Id be interested in Joining in on this, I originally wanted to build an Atlantis style build in an ocean somewhere but because of the game mechanics that would be a wasted effort, so an underground build would a great alternative, thinking Moria but with some Skyrim blackreach influences.
1 Like
I guess we first need to find out what timezones we’re all in and whether we’re PC or PS4 players. US-East and PC here, but right now i mainly play on AUS servers so I’m good to go wherever.
I have always wanted a huge underground city in the game. Had dreams of starting one myself, but decided it was too big a project to tackle myself and at the time no one seemed super interested in it. My wife and I are currently building our own “floating” city, so I can’t donate a lot in terms of plots, but if you want some help digging I will be more than happy to lend a hand. 
Been lookin for a underground city
I initially wanted to make an underground medieval city but opted not to. Making a cave system big enough to be good looking requires an insane amount of plots, especially if you are going to make a big city. With the plot system that we have, I already see myself spending so many plots just to keep trees from respawning, I could never see myself build large scale underground sadly.
But if you ever wanna talk medieval ideas with me, I am definitely all for it! I have a medium sized medieval town in the works and love to share ideas and such with other avid medieval builders!
Here is one screenshot from the screenshot post.
1 Like
Sounds like it’ll be great!
I’d recommend doing some tests first though and planning around the results, I think there some awkward mechanics that can make massive underground builds work poorly.
For example, unless something has changed (and it could have done, it’s been a good while since I looked into it), a sufficiently large cave can be built that the chunks at the other side aren’t loaded. When that happens, you’ll just see daylight in the distance, which really ruins the cave aesthetic.
1 Like
I have a build in a cave system and I love how the lighting works from the holes that lead above ground. I have hidden lighting in my build but in the day time you can see everything more clearly since the light comes down.
1 Like
@xmayhemx this sounds like a heck of an amazing idea!!!
As @Clexarews said; what are your ideas for this? Or art concepts? If I’m not mistaken, the amazing Habbabba(?) Has built a pretty neat underground Yoda hut looking city and posted pics on the forum here. He would be a good person to talk to about building under there. Asking questions such as, “what was the hardest part” “how do you plot plan the build” and “where to start once its all excavated”. Or heck, the always amazing @FireAngelDth is already here! I’d talk to him too about that.
@QuimbyBoundless that place is gorgeous!!! I was looking to build something like that on my raxxa plots, cause those old medieval builds have always priqued my interests, but couldn’t find the right inspiration in game to pull ideas from. Would it be alright if I borrowed a couple ideas from you from that pic? Mainly the dock idea?
@FireAngelDth I’d love to see some screen shots of your beautiful cave build! Maybe the OP can pull some ideas off that too?
When I get on I’ll post it. I Find it beautiful but it’s a vault and still a wip. So I dunno how much inspiration they’ll get
Thanks! Glad someone appreciates it!
You are free to copypaste everything if you like. Feel free to PM me at anytime if you have any questions or need ideas in general 
still can’t find you 
Edit…
Found you !!
I checked out Sorissi and the caves are nice but also there’s water by the mantle, not lava. I also looked at Till b/c the surface seems to fit the aesthetic people like but the caves are tiny and the rock is a weird color. Anyone find any better locations? I remember one of the old test worlds had giant caves with like gleam trees inside and it remains one of the coolest things I’ve seen in this game. Somewhere like that would be awesome.
You want to build at the mantel? Also didn’t think water would be a deal breaker. Easier to work with over lava.
I want to build at an altitude low enough that creating a cavern would not break the roof and expose the sky in order to fit with an underground city. Mantle seems to be the best bet for that. And easier to work with yes, but water doesn’t really fit the aesthetic of the pictures of D’ni that @DKPuncherello and @Kirinvar posted.
Hmm I thought that was water n lava in those pictures
Right but we’re confined to the looks of Boundless and water doesn’t glow orange like that 
Hi all
I recently started a underground city on malurialakrib it was going to be 20x20x3.
when I started digging it out I noticed creatures just started randomly spawning I’m assuming it was because off the massive open space that I had created.
It became very annoying to the point off where I was dying more time then I wanted to.
I stopped in the end thinking it wouldn’t be good to invite people to live there and they had nowhere to run and hide.
Just thought I would share my experience.
That actually sounds like a lovely way to farm eyes and trophies hahaha
My base on McRib is partially built 1 block under lava for that very reason 