Cave Control

Cave Control is a mod by Reika that can be used to control the generation of underground structures, such as Strongholds, Mineshafts, and Dungeons. It also allows for other underground tweaks, such as enabling/disabling caves below Y=10 being filled with lava or water, and global/biome cave modes. Global cave mode sets all ravine and cave density multiplier settings to affect all biomes, whereas biome cave mode allows for adjusting the settings in specific biomes.