Will there be underground caves, tunnels, or cities?

I can't say yes or no right now. So I'm going to give sort of a roundabout answer on that. The most important thing for us for the next little while is to get all our more standard biomes set up. We've got deserts, we've got toxic ones, we've got timber that we have to set up. We've got a bunch of different ones, and we've got enough area to cover without even delving into caves and things like this. We've already got enough content that we need to add to these biomes before we move on to that. I'm pretty sure this is going to be something that we're going to look into, but as of right this moment, I can't say yes or no whether we're going to have those. But of course, if time allows and we get to the place where our biomes and the surface itself are acceptable to us, then yeah, that would be something to look at. As with any of my answers, it always goes a little bit longer. But there's other ways to accomplish this rather than fully voxelizing terrain and making it fully dynamic, because we can place points of interest very similar to how the outposts get placed. If we wanted to go the route of, yeah, we've actually modeled this into the side of a hill or whatever, then that's not beyond the realm of possibility. So if design ever comes up with a need for that, or a given landing zone needs that, then that might make sense. But as of right now, I can't say either way, but it's definitely something we want to look into, I'm sure.