CaveBiomes 1.7.10 is a mod that aims to make the underground exploration in Minecraft something more interesting. So now, when you are exploring through the Minecraft deep caves you will sometimes find new and small biomes.
These new caves will appear depending on the bioma in which you are. Other things like its hight situation will also be related with the belonging biome so you will have to move and explore in different areas if you want to find them.
There are different types of caves, for instance, vocanic, ice, vegetation or mushroom caves, though there are lots of more to discover.
