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Underground WorldsMinecraft mod for 26.1.2

Adds underground biomes and underground dungeons, as well as some above ground structures, in a modular and configurable way.

newest supported release 26.1.2World StructuresWorld GenWorld MobsWorld Biomes
Latest version
UndergroundWorlds - NeoForge - 3.2.1 - 26.2
Minecraft
1.19.4 to 26.1.2
Java
Java 25+
Loaders
Forge, NeoForge, Fabric
Licence
not stated
Downloads
1.2M
Updated
2 mo ago
Available on
CurseForge

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Underground Worlds declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
26.1.2Forge, NeoForge, Fabric25+declared9 Apr 2026
26.1.1Fabric, NeoForge, Forge25+declared1 Apr 2026
26.1NeoForge, Forge, Fabric25+declared24 Mar 2026
1.21.10NeoForge, Fabric, Forge21+declared7 Oct 2025
1.21.8NeoForge, Fabric, Forge21+declared17 Jul 2025
1.21.4NeoForge, Fabric, Forge21+declared3 Dec 2024
1.21.1NeoForge, Fabric, Forge21+declared8 Aug 2024
1.20.4Forge, NeoForge, Fabric17+declared7 Dec 2023
1.20.3NeoForge, Fabric, Forge17+declared4 Dec 2023
1.20.2Fabric, NeoForge, Forge17+declared20 Sept 2023
1.20.1NeoForge, Forge, Fabric17+declared12 Jun 2023
1.19.4NeoForge, Fabric, Forge17+declared14 Mar 2023

Download

From Underground Worlds’s own host. Nothing is re-hosted here.

Browse 52 indexed releases

For Minecraft 26.1.2

Choose the loader you use before downloading.

  • NeoForge

    UndergroundWorlds - NeoForge - 3.2.1 - 26.1 · 2 Sept 2026 · undergroundworlds-neoforge-3.2.1-26.1.jar

    Get NeoForge

  • Fabric

    UndergroundWorlds - Fabric - 3.2.1 - 26.1 · 2 Sept 2026 · undergroundworlds-fabric-3.2.1-26.1.jar

    Get Fabric

  • Forge

    UndergroundWorlds - Forge - 3.2.1 - 26.1 · 2 Sept 2026 · undergroundworlds-forge-3.2.1-26.1.jar

    Get Forge

Most recently published release

UndergroundWorlds - NeoForge - 3.2.1 - 26.2release2 Sept 2026

undergroundworlds-neoforge-3.2.1-26.2.jar · 3.9 MB · for 26.2 · NeoForge

Download this release
110fd2e4ab68…
Older versions24
  • UndergroundWorlds - Fabric - 3.2.1 - 26.22 Sept 202626.24.0 MBe204232be56d…Get
  • UndergroundWorlds - Forge - 3.2.1 - 26.22 Sept 202626.23.9 MB90b3124a4d42…Get
  • UndergroundWorlds - NeoForge - 3.2.1 - 26.12 Sept 202626.1.2, 26.1.1, 26.13.9 MBd45149278125…Get
  • UndergroundWorlds - Fabric - 3.2.1 - 26.12 Sept 202626.1.2, 26.1.1, 26.14.0 MB10538fa710fb…Get
  • UndergroundWorlds - Forge - 3.2.1 - 26.12 Sept 202626.1.2, 26.1.1, 26.13.9 MBb28b713907ab…Get
  • UndergroundWorlds - NeoForge - 3.2 - 26.228 Aug 202626.23.9 MBdc9ff54eaec1…Get
  • UndergroundWorlds - Fabric - 3.2 - 26.228 Aug 202626.24.0 MBfec3d29dba25…Get
  • UndergroundWorlds - Forge - 3.2 - 26.228 Aug 202626.23.9 MB777ecc61416e…Get
  • UndergroundWorlds - NeoForge - 3.2 - 26.127 Aug 202626.1.2, 26.1.1, 26.13.9 MB3afc3b1842c1…Get
  • UndergroundWorlds - Fabric - 3.2 - 26.127 Aug 202626.1.2, 26.1.1, 26.14.0 MB9c4c02b05d8d…Get
  • UndergroundWorlds - Forge - 3.2 - 26.127 Aug 202626.1.2, 26.1.1, 26.13.9 MB7c71970df603…Get
  • Underground Worlds - NeoForge - 3.1.3 - 26.19 Jul 202626.1.2, 26.1.1, 26.13.8 MB38 downloadsd2b68858fc66…Get
  • Underground Worlds - Fabric - 3.1.3 - 26.19 Jul 202626.1.2, 26.1.1, 26.13.9 MB170 downloads5b274496be05…Get
  • Underground Worlds - Forge - 3.1.3 - 26.19 Jul 202626.1.2, 26.1.1, 26.13.8 MB20 downloadsc8ee8cde864c…Get
  • Underground Worlds - NeoForge - 3.1.2 - 26.131 May 202626.1.2, 26.1.1, 26.13.8 MB35 downloadsbc73d07a7a2f…Get
  • Underground Worlds - Fabric - 3.1.2 - 26.131 May 202626.1.2, 26.1.1, 26.13.9 MBc2b514f9717a…Get
  • Underground Worlds - Forge - 3.1.2 - 26.131 May 202626.1.2, 26.1.1, 26.13.8 MB25ed1f408d6b…Get
  • Underground Worlds - NeoForge - 3.0.2 - 1.21.1031 May 20261.21.103.7 MB1e73b4bcb8c0…Get
  • Underground Worlds - Fabric - 3.0.2 - 1.21.1031 May 20261.21.103.7 MB5dc744713e0a…Get
  • Underground Worlds - Forge - 3.0.2 - 1.21.1031 May 20261.21.103.7 MB3ec2147c3a50…Get
  • Underground Worlds - NeoForge - 3.0.2 - 1.21.831 May 20261.21.83.7 MB079ef3a95390…Get
  • Underground Worlds - Fabric - 3.0.2 - 1.21.831 May 20261.21.83.7 MBd423df6657ed…Get
  • Underground Worlds - Forge - 3.0.2 - 1.21.831 May 20261.21.83.7 MB104ba78b7a74…Get
  • Underground Worlds - NeoForge - 3.0.2 - 1.21.431 May 20261.21.43.7 MB11d6c662fe8c…Get

Frequently asked

Does Underground Worlds work on Minecraft 26.1.2?

Yes. 26.1.2 is the newest Minecraft version Underground Worlds declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Underground Worlds support?

Everything the author has declared, from 1.19.4 up to 26.1.2. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does Underground Worlds support?

Forge, NeoForge, Fabric. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Underground Worlds?

Among the supported Minecraft releases above, the highest recorded requirement is Java 25 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

How do I install Underground Worlds?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Underground Worlds safely?

Start with the author's page on CurseForge, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

BookshelfAn open source library for other mods!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.Jade 🔍Shows information about what you are looking at. (Hwyla/WAILA fork for Minecraft 1.16+)

Details from CurseForge, where the author last updated it on 2 Sept 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .