ModsFinder

Upgrade Underground

by reflectant

Upgrade Underground is a Forge world generation mod for 1.20.1 that adds new cave biomes, tools, items and small quality-of-life tweaks.

ForgeClient and serverAll rights reserved1.20.1

What it does

Caves gain new biomes and items, along with tools that make exploring underground quicker, and small tweaks to everyday play. The server and every player need the mod installed. Forge is the only loader, and files target 1.20.1 alone; the newest is 1.7.8, released on 2026-10-11, and the mod is licensed as All rights reserved, a license that is not open source.

Key features

  1. New cave biomes

    Underground areas gain new biomes, adding variety to the caves players dig through.

  2. Underground structures

    Players can stumble upon small structures while exploring, such as a lichen hut.

  3. Starter loot shelters

    A small abandoned shelter holds starter loot, and the lichen hut has a high chance of coal torches, lichen mushrooms and enchanted axes and pickaxes.

Compatibility

Latest build for each game version and loader.

1.20.11.7.8
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

How it compares

Full comparison

Connected Caves is another Forge cave mod for 1.20.1 under the MIT License, but it is not open source. Newfound Underground is open source under the MIT License and also covers 1.20.1 on Forge.

ModLoadersGame versionsEnvironmentUpdated
Upgrade UndergroundForge1.20.1Client and server2026-10-11
Connected CavesForge1.20.1Client and server2026-08-27
Newfound UndergroundForge1.20.1Client and server2026-05-21

Questions

Does Upgrade Underground need to be installed on the server?

Yes. The server and every player need the mod installed.

Which game version does Upgrade Underground support?

Files are published for 1.20.1 only, on Forge only.

In the catalog

Upgrade Underground is one of 8,515 World generation mods on ModsFinder, and one of 5,058 World generation mods for Forge. 34,764 mods support Minecraft 1.20.1.

World generation mods8,515Forge modsMods for 1.20.134,764

More from reflectant

All projects
Upgrade Arid1.20.1

Similar mods

Biomes O' Plenty1.7.10 – 26.3Cobblemon1.19.2 – 1.21.1Terralith1.18.2 – 26.3YUNG's Better Nether Fortresses1.18.2 – 26.1.2Dungeons and Taverns1.19 – 26.3Yeetus Experimentus1.18.2 – 26.3

What the author says

Underground Structures Keep your eyes open while exploring. You can now stumble upon two small structures. Lichen Hut: A small abandoned shelter containing starter loot. High chance to find Coal, Torches, Lichen Mushrooms, and even enchanted Axes or Pickaxes.
reflectant, on the Modrinth page

Official listing

Owner
reflectant
Published
2026-08-02
Updated on Modrinth
2026-10-11
Facts verified
2026-10-15

Tags

AdventureEquipmentWorld generationDecoration
Open on ModrinthCompare