CaveMC is a semi anarchy survival server where the overworld is completely underground. There is no surface at all. The whole world is just caves with custom generation made by real Minecraft developers.
Season 2 is a fresh start for everyone and the server is enhanced vanilla. The caves have different biomes resources and structures so it feels like a full world but under the ground. Survival is really hard and only players who plan and grind will last long.
There is also a new Wasteland dimension. It is a big expansion with its own custom generated map. In the Wasteland you can fight for brand new powerful gear search huge mega structures and uncover secrets and resources. The Wasteland has its own currency and a new player economy so trading and buying stuff feels different there.
The server has a new spawn built for this season and for the Wasteland challenges. From what I see the whole idea is to create a brutal underground experience with lots of exploration pvp and grinding for the best gear.

