CaveMC is a semi anarchy survival server with enhanced vanilla gameplay. The whole overworld is underground so there is no surface at all. It feels like you are living in one giant cave world with biomes resources and structures hidden everywhere.
Season 2 is a fresh start with a bunch of additions. Survival is brutal and you have to be smart to make it.
There is also a big expansion called the Wasteland Dimension opening on November 8th. It has new gear to fight for huge mega structures with secrets and its own currency for a player driven economy. There is also a new spawn and a custom generated map with special features you will not find in normal worlds.

