This server is called CaveMC and it is on Season 2 right now. The whole overworld is underground so there is no surface at all. It is like enhanced vanilla survival with a semi anarchy style so the world feels harsh and brutal and only smart players really last long.
The caves are not normal. The world is made with custom generation by real Minecraft developers so there are tons of different underground biomes resources and structures to find. Everywhere you go you are still in caves but the caves feel huge and alive.
The server also has a brand new Wasteland Dimension opening for players. This place has special gear that you can only get there so fighting for it makes combat and survival feel way more intense. There are giant mega structures with secrets and good loot so exploring actually feels like an adventure.
The Wasteland has its own currency and its own player economy and that makes trading and planning your trips there more important. There is also a new spawn that fits the Wasteland theme and helps set the mood for the challenges.
Overall CaveMC feels like a tough underground survival server where the world is super unique and players who like danger and exploration will probably have a lot of fun.
