How do I install CaveBlock - Underground Survival?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on Modrinth — not every file is mirrored on our own servers.

What Minecraft version does CaveBlock - Underground Survival work with?

The listing gives Minecraft 1.21.3, 1.21.4, 1.21.5, among others. This is the version stated by the author or source site, not something we verified ourselves.

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CaveBlock - Underground Survival

by tastybento · on Modrinth

Extreme underground survival. Start deep in a cave with nothing - dig, mine, and build your way to the surface.

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Mod loader Paper1 build
Mod loader Purpur1 build
Mod loader Spigot1 build

Minecraft version

Minecraft 1.21.3–1.21.8Newest

Minecraft 1.21.3–1.21.8Newest

Minecraft 1.21.3–1.21.4Newest

⬇ Download for 1.21.3–1.21.8 · Paper ⬇ Download for 1.21.3–1.21.8 · Purpur ⬇ Download for 1.21.3–1.21.4 · Spigot

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MC Java Mods Get it on Google Play →

⛏️ CaveBlock — Can You Dig Your Way Out?

You wake up deep underground. No sky, no trees, no surface. Just stone in every direction.

CaveBlock flips the SkyBlock formula upside down — literally. Instead of starting above the void and building down, you start buried underground and must mine, dig, and tunnel your way toward the surface. Every block you break is progress. Every cave you discover is an opportunity.

🎮 How It Works

🪨 Start underground — surrounded by stone, deepslate, and darkness
⛏️ Mine everything — resources are earned through digging, not generators
🔦 Discover caves — natural cave systems, ores, and lava await
☀️ Reach the surface — break through to the sky and build above ground
👥 Teams — work together to excavate faster

⚙️ Features

Inverted SkyBlock — a fresh take for players tired of void islands
Configurable world — set the depth, block types, cave frequency, and ore distribution
Full protection system — island boundaries, team permissions, and protection flags
All BentoBox addons — challenges, levels, warps, and more work with CaveBlock
Free and open source

📦 Installation

Requires BentoBox on a Paper server.

Install BentoBox
Place CaveBlock.jar into plugins/BentoBox/addons/
Restart
/cave to start playing

📖 Docs: docs.bentobox.world | 💬 Discord: discord.gg/BentoBoxWorld | 🐛 Issues: GitHub

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 1.21.3, 1.21.4, 1.21.5
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

Verified by MCModsHub

Ships as CaveBlock-1.20.1.jar — drop this file into the mods folder
Download size: 176 KB
Download link checked 6 Sept 2026 — working

These come from our own check of the pack file, not from the source page.

Explore more

All Mods for Java All Minecraft Java mods Java mods for 1.21