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Deep Underground (Mining Dimension)

Adds a 256-block tall deepslate cave dimension

Fabric
Loaders
Fabric
Downloads on Modrinth
14.7K
Followers on Modrinth
6
versions
5
Updated
March 25, 2026Mar 25
Published
in 2025
The Deep Underground Portal — Constructed with framed polished blackstone blocks and lit with a lava bucket. · swipe

At a glance

Runs on Fabric
For Minecraft 1.21.1
Needed in the game and on the server
Latest version — 1.1.0 from March 25, 2026
License MIT — free
Where it's needed
In gamerequiredOn serverrequired

Needed both in the game and on the server

Game versions1.21.1

Overview

Deep Underground adds a simple 256-block tall mining dimension. It has three biomes: Deep Cave, Deep Dripstone Cave and Frozen Cave. The dimension has boosted ore generation rates, boosted mob spawn rates and has three unique stone types: Black Granite, Grimslate, and Schist.

To create the portal, craft at least 10 framed polished blackstone blocks, place them in a Nether portal shape and light it with a lava bucket.

A screenshot of the Deep Underground portal, in the Frozen Cave biome that only exists in the new dimension.

The dimension is very dark, and coal doesn't generate. However, additional ores and structures can easily be added with external datapacks.

When mining deeper down into the dimension, Viridium and Cerulium can be found, which can be crafted into armor and tools. Cerulium can also be used to make Depthbound Steel which is obtained by leaving an Inert Depthbound Block below Y=24 in the dimension. After 1.1.0, Cyclite (a furnace fuel) can rarely generate as an ore, or be found in rare geodes.

Compatibility

The mod has biome icons for compatibility with EMI Ores and Continuity support for the framed polished blackstone block. A future update will add proper biome tags.

Can I Use This in a Modpack?

Yes! I actually created this mod for use in a modpack after discovering there wasn't already a similar mod on this version.

FAQ

How to install Deep Underground (Mining Dimension)?

Install Fabric for your Minecraft version, download Deep Underground (Mining Dimension) for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does Deep Underground (Mining Dimension) support?

Deep Underground (Mining Dimension) has builds for Minecraft 1.21.1.

Is Deep Underground (Mining Dimension) needed on the server?

Needed in the game and on the server

License and source
MIT Licensefree to use and share with credit to the author
Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders

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