This project has moved to Planet Minecraft.

This data pack transforms the underground into a more diverse and interesting experience.

The following features are added by this data pack:

17 new underground biomes, with varying stone types, deposits, and decorations.
7 new fossils (in addition to the existing fossils)
New rich ore deposits for every ore type
5 new dungeons found in caves

It also adds recipes to allow you to mix and match stone types when crafting stone tools, and functional blocks that use stone (furnaces, levers, blast furnaces, repeaters, etc.), as well as being able to uncraft prismarine into shards, combine walls into full blocks, and glass panes into glass blocks (so that decorations and stone types have more uses).

Please note this data pack may not be compatible with other data packs that do their own world generation (i.e. anything more complicated than replacing vanilla structures), and most definitely isn't compatible with data packs that also add underground biomes.

Installing this data pack onto worlds with underground builds below sea level may result in those builds having blocks changed/added due to the world generation this data pack performs.

More information about data packs and how to use them can be found on the official Minecraft Wiki.

Underground Overhaul