New Biomes by Arkatron
If you like underground biomes, this thing is for you.
Underground_utility
A collection by Arkatron
This package aims to provide some necessary utilities for underground survival
Packages
Insane crafting recipies by Arkatron
Adds special crafting recipies
New pickaxes by Arkatron
Adds new pickaxes
Underground Survival Lighting by Arkatron
If you like underground light in survival, use this mod, it can help that.