looking to get some recommendations here for existing mods that may make the underground of minecraft more interesting. i know about the cave biomes mod but i dont feel it suits minecraft. a couple points that would be nice to find:
more interesting cave types, more than just mines and crevasses.
deeper underground (more to mine, deeper caves)
more cave / underground only mobs (other than bats)
The Meaning of Life, the Universe, and Everything.
Maumee Ohio USA
The portals are entierly below the world, once you go to each place once you cannot tell the difference between layers, the teleports are instant. If your looking for a tall world height mod, its not possible.