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UndermodMinecraft mod for 1.20.1

Sewers that link villages together, giant craters, underground forests, rivers and seas.

client and servernewest supported 1.20.1MobsEquipmentDecorationWorldgen
Latest version
0.2.1
Minecraft
1.16 to 1.20.1
Java
Java 17+
Loader
Forge
Licence
LicenseRef-All-Rights-Reserved
Downloads
38.1k
Updated
17 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Undermod servers

One click and Undermod is installed with the right loader, on hardware built for it.

  • 1.20.1
  • Forge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

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

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.20.1Forge17+declared12 Jun 2023
1.16.5Forge8+declared14 Jan 2021
1.16.4Forge8+declared29 Oct 2020
1.16.3Forge8+declared10 Sept 2020
1.16.2Forge8+declared11 Aug 2020
1.16.1Forge8+declared24 Jun 2020
1.16Forge8+declared23 Jun 2020

Download

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

0.2.1beta23 Apr 2025

Undermod-1.20.1-0.2.1r.jar · 2.9 MB · for 1.20.1

Download latest
a272aba9e966…
Older versions5
  • 0.2.031 Mar 20251.20.12.9 MB577 downloads13d42b401410…Get
  • 0.1.325 Mar 20251.16.52.9 MB592 downloads6d1f3b5ae886…Get
  • 0.1.213 Mar 20251.16.52.9 MB77 downloadse1145b27653d…Get
  • 0.1.110 Mar 20251.16.52.9 MB58 downloads4d096b537367…Get
  • 0.1.022 Feb 20251.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1 +1 more2.9 MB160 downloadsb77e603b723f…Get

Frequently asked

Does Undermod work on Minecraft 1.20.1?

Yes. 1.20.1 is the newest Minecraft version Undermod 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 Undermod support?

Everything the author has declared, from 1.16 up to 1.20.1. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Undermod on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does Undermod support?

Forge. 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 Undermod?

On the newest Minecraft version it supports, Java 17 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

What licence is Undermod under?

LicenseRef-All-Rights-Reserved, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Undermod?

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 Undermod safely?

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

Works on the same versions

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

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Last checked 2 mo ago against Modrinth. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

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