SUBSTELLAR
Y=319 · build limit
Minecraft Java Edition · Earth Overworld overhaul

The surface stays recognizable. The new work is underground.

Extra vertical space is underground. Scroll down the working column, from the surface to bedrock.

Column
Y=-352 through Y=319
Sea level
63
Depth
288 blocks under the vanilla floor
Height
The final height is not locked.
Y=63 · sea level
Vanilla underground

The Shallows

The vanilla underground, between the surface and the new depths. They are not a new biome set.

Layer
Stone Deepslate
Ores · vanilla ranges
Coal Copper Iron Gold Redstone Lapis Diamond near the old floor Emerald in mountains

The new colors begin at Deepwilds.

New depth 1 of 3

Deepwilds

These are the most open caves.

Biomes
Fracture HallsRiver LowlandsDeepwilds Grove
Rivers are water.
Layer
Tuff then Calcite Andesite Mud Clay Moss Rooted dirt
Ores · whole depth
Tin Zinc Silver Sulfur Apatite
Loot rooms
Fracture campGrove shrine
Deepwilds Grove
The only planted place.
Moss Azalea Rooted dirt Spore blossoms Glow lichen
All vanilla.
Light band
Calcite, diorite, and andesite. 4 to 8 blocks thick.
working center ≈ Y=-116
New depth 2 of 3

Underreach

Tighter caves.

Biomes
Drip GalleriesStill LakesTunnel Maze
Lakes are water. Crude oil sits in pockets, not in a sea.
Layer
Dripstone block then Calcite Clay Sand Cobblestone
Minerals · whole depth
Lead Nickel Bauxite Fluorite Salt Certus quartz Niter
Loot rooms
Drip hollowLake cache

Certus quartz is a mineral here, not a meteor on the surface.

Dark band
Obsidian and crying obsidian. 4 to 8 blocks thick.
working center ≈ Y=-170
New depth 3 of 3

The Abyss

These are the tightest caves.

Biomes
Close WarrenMagma VentsQuiet Vaults
Magma vents are pockets, not a lava sea.
Layer
Polished deepslate then Cobbled deepslate Bricks Tiles or the vent mix Blackstone Basalt Magma Netherrack
Ores · whole depth
Osmium Uranium Cinnabar
Loot rooms
Warren nookVault alcove
A thin lava band stays under Y=-208.
Below the magma band

The Core

Smooth quartz. One mineral, and only here.

Ores · whole depth
Draconium
Y=-352 Bedrock

Ores by depth

The chart is the Overworld column only. The Nether and the End are unchanged. An ore belongs to a whole depth, not to one biome. The light band and the dark band are stone bands and have no ores of their own. The magma band has none either. Final world height is not locked. This chart is generated.

Shallows
Vanilla ranges, unchanged
Coal Copper Iron Gold Redstone Lapis Diamond near the old floor Emerald in mountains
Deepwilds
Tin Zinc Silver Sulfur Apatite
Underreach
Lead Nickel Bauxite Fluorite Salt Certus quartz Niter
Certus quartz generates as a mineral in this depth, not as a surface meteor.Salt is a mineral beside the lakes.
Abyss
Osmium Uranium Cinnabar
Core
Draconium
Only in the smooth quartz.None in the Mantle.
Liquids in the column
Sea water at Y=63 River water in the Deepwilds Lake water in the Underreach Crude oil pockets in the Underreach Lava in the magma-vent pockets The thin lava band under Y=-208
Crude oil is pockets beside the Underreach lakes.A bucket can pick it up.Machine fluids, including creosote, biodiesel, and the Mekanism acids and gases, are not world layers.

Not on this chart. The Moon, Mars, the Jupiter system, Pluto, and the unrevealed star system. Tools, armor, and machines.

Plainly

There are no new mobs, spawners, tools, armor, or machines.