Very nice - appeals to my old school heart. Cavern complexes are one of my favorite parts of any dungeon complex. It can be hard to get caverns to play nicely with a grid though, no matter what tool you are using (not that I have a vast knowledge of other tools). In my Undermountain WIP I've been struggling to get CC3 to do what I want when it comes to caverns and grids, but I think I've come up with a good solution.
What software did you use to make this?