Deep Underground (Mining Dimension)

Deep Underground (Mining Dimension)

Adds a 256-block tall deepslate cave dimension

by
8.7K Downloads
fabricequipmentworldgen
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Screenshots

The Deep Underground Portal
Connected Texture Support
The Deep Underground
Deep Cave
Deep Dripstone Cave
The Frozen Cave Biome

About this Mod

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.

Available Versions

Deep Underground 1.1.0release
MC 1.21.1fabric
March 25, 2026
Deep Underground 1.0.2release
MC 1.21.1fabric
November 5, 2025
Deep Underground 1.0.1release
MC 1.21.1fabric
November 2, 2025
Deep Underground 1.0.0release
MC 1.21.1fabric
May 31, 2025
Deep Underground 0.1.0arelease
MC 1.21.1fabric
May 27, 2025

How to Install Deep Underground (Mining Dimension) on Your Server

1

Order Server

Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).

3

Install Mod

Open the mod browser in the dashboard and search for "Deep Underground (Mining Dimension)". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.1

Server-side

Required

Recommended RAM

6 GB(min. 4 GB)

Frequently Asked Questions

Deep Underground (Mining Dimension) server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 4 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.

Is Deep Underground (Mining Dimension) compatible with fabric?

Deep Underground (Mining Dimension) officially supports fabric for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Deep Underground (Mining Dimension) – how to optimize performance?

Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Deep Underground (Mining Dimension) consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install Deep Underground (Mining Dimension) with just one click on your server.

Recommended RAM
6 GBab €12/mo
Min. 4 GB | +1 GB pro 5 Spieler
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NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

1.21.1