In real life the more you go down the more the type of ground changes i have divided it in 4 possible new biomes based on the deeper they are:
1upperlevel:classic minecraft underground but without water or lava.
2water level: i imagine it formed by mossy stone and a lot of water, in this level is very common to find lapis, this is inspired by the underground water in our planet.
3transaction level:formed principally by cobblestone and obsidian in this level is very common to find iron,redstone,gold.
4deep level:pretty much covered in magma block and lava.
The names of the biomes could be changed tho.
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