Cave-Instability

Dig carefully—every block you remove could bring the cave down around you.

Cave-Instability makes underground mining more dangerous, dynamic, and believable by allowing unsupported cave materials to collapse.

Blocks configured as unstable can fall when support is removed, triggering localized cave-ins that spread through nearby material. Falling debris produces impact sounds and dust particles, turning excavation into something that requires a little more thought than simply swinging a pickaxe.

Cave-Ins

Removing support from unstable material can trigger a localized collapse. Cave-ins can propagate horizontally and vertically through nearby blocks, allowing anything from a few loose blocks to a substantial section of cave to come crashing down.

Collapse behavior is highly configurable, including the chance of individual blocks or entire block tags becoming unstable.

Debris Sliding & Avalanches

Falling material doesn't always stop where it lands.

Debris can slide downhill and continue falling until it reaches stable ground, producing natural-looking piles and avalanches instead of perfectly vertical stacks.

Debris sliding can be enabled or disabled, and the maximum number of slides is configurable.

Floating Group Collapse

No more magically floating chunks of rock.

Cave-Instability can detect connected groups of unstable blocks that have become completely detached from the surrounding terrain and collapse the entire formation.

A configurable search limit prevents excessively large floating formations from causing expensive searches.

Build Supports to Protect Your Mine

You don't have to leave survival to chance.

Players can reinforce caves with functional support pillars constructed from configurable materials.

A valid support connects the cave floor to the ceiling. Properly constructed supports stabilize nearby material and can prevent cave-ins from starting within their effective radius.

Support materials and detection distances are configurable, allowing support systems to work with both vanilla and modded blocks.

Fully Configurable

Cave-Instability includes full Mod Menu and Cloth Config integration.

You can configure:

• Cave-in probability
• Horizontal and vertical collapse range
• Cave-in delay
• Debris sliding
• Maximum debris slides
• Floating-group collapse
• Floating-group search limit
• Support pillars
• Support radius and detection tolerances
• Valid support materials
• Collapsible blocks and block tags
• Individual collapse probabilities for configured materials

Block IDs and tags can be used throughout the configuration, making it easy to add materials from other mods.

Make It as Dangerous as You Want

Cave-Instability is designed to make caves feel less static while remaining highly configurable.

Keep the settings subtle for occasional cave-ins, increase the instability for dangerous underground exploration, or build reinforced mines where careful excavation and properly constructed supports become part of survival.

Compatibility

Minecraft: 1.21.1
Mod Loader: Fabric

Cave-Instability supports vanilla and modded blocks through Minecraft block IDs and tags.

Requirements

• Fabric API
• Mod Menu
• Cloth Config API

License

All Rights Reserved.

Cave-Instability and its source code are publicly available for viewing and reference purposes only.

You may use the mod for personal use and include it in modpacks. Redistribution, rehosting, modification, or publication of modified or ported versions of the mod is not permitted without explicit permission from the author.

© 2026 Itinerant Mods

Support

If you enjoy my mods and would like to support future development, you can find Itinerant Mods on Ko-fi.

Author

Created by Itinerant Mods.

Ko-fi • YouTube