CurseForge · Minecraft mod
Upgrade Underground - Caves Overhaul
A Cave-Overhaul mod that adds new biomes, tools, structures, items, and enhances QoL by adding small tweaks
Quick answer
Which Upgrade Underground - Caves Overhaul release should I use?
Upgrade Underground - Caves Overhaul upgrade_underground-1.7.1-forge-1.20.1.jar targets 1.20.1 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is Upgrade Underground - Caves Overhaul required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Upgrade Underground - Caves Overhaul upgrade_underground-1.7.1-forge-1.20.1.jar need?
upgrade_underground-1.7.1-forge-1.20.1.jar. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
1 extra mod was pulled in by another dependency. Indented rows show who needs each one. We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Upgrade Underground - Caves Overhaul without breaking your instance.
Built for Upgrade Underground - Caves Overhaul upgrade_underground-1.7.1-forge-1.20.1.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use upgrade_underground-1.7.1-forge-1.20.1.jar. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside upgrade_underground-1.7.1-forge-1.20.1.jar. It opens that exact file at the source.
About this project
What does Upgrade Underground - Caves Overhaul add?
Upgrade Underground is a lightweight Vanilla+ cave-overhaul mod designed to add more subterranian content. It introduces an new biome, essential underground survival items, deeper progression mechanics, and unique structures to discover while mining.
Lichen Garden
A frequent underground biome overflowing with life.

Lichen Vegetation: Lichen Sprouts, Tall Lichen Sprouts, and Lichen Mushrooms.
Lichen Wood: Chop down Lichen Trees to gather exclusive Lichen Wood and Lichen Leaves for building.


Glow Lichen Cap: A handy early-game helmet made from a Leather Helmet, a Lichen Mushroom, and 2 Lichen Sprouts. It provides 1 Armor and acts as a portable light source (Level 6 light in a 3x3x3 area).

Lichen Mushrooms: A new cave food source. Cook them to save yourself from eating rotten flesh! They smelt faster, though they provide low saturation.

Underground Structures
Keep your eyes open while exploring. You can now stumble upon new structures.
Lichen Hut: A small abandoned shelter containing starter loot. High chance to find Coal, Torches, Lichen Mushrooms, and even enchanted Enchanted Axes or Pickaxes.
Jellyshroom Caves
A Rarer Cave Biome.

Jelly Blocks

Jelly Block
Main filler block. Used for building, and crafting Polished Jelly Block.

Polished Jelly Block
Crafted with 4 Jelly Blocks. Really Slippery.

Jelly Spike
Spawn in Jelly Caves. Slow you down when stepping on it.

Jelly Spire
Functions the same as Jelly Spikes.

Nocturnflower
These Glowing Flowers Now appear inside any Caves.

Project description from CurseForge.
Pick your setup
Upgrade Underground - Caves Overhaul by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.20.1
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Upgrade Underground - Caves Overhaul versions and loaders
upgrade_underground-1.7.1-forge-1.20.1.jar
17 Aug 2026
upgrade_underground-1.7.0-forge-1.20.1.jar
16 Aug 2026
upgrade_underground-1.6.0-forge-1.20.1.jar
11 Aug 2026
upgrade_underground-1.4.3-forge-1.20.1.jar
8 Aug 2026
upgrade_underground-1.1.4-forge-1.20.1.jar
6 Aug 2026
upgrade_underground-1.1.2-forge-1.20.1.jar
4 Aug 2026
upgrade_underground-1.1.0-forge-1.20.1.jar
2 Aug 2026
Looking for an older file? The official CurseForge project page is in Resources.