Subterranean Expansion | Cave Update
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Overhaul of underground caves in the overworld.
Includes a large focus on traversing worlds with enhanced world generation, structures, dungeons, and more for players to find unique loot.
General improvements to world generation, such as bug fixes, aesthetic overhauls, or misc additions.
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CurseForge
Modrinth
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Must be installed on both the client and the server.
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About
Description
About Subterranean Expansion:
Subterranean Expansion enhances the underground experience of vanilla caves by introducing new natural features and unique cave environments to bring you the cave update we all actually wanted.
Stalagmites & Stalactites:
Stalagmites and Stalactites of all vanilla stone variants, and even some custom stone variants.
<details> <summary>Stalagmites & Stalactites</summary>
In Release 1.0.0:
- Stone Stalagmite/Stalactite
- Mossy Stone Stalagmite/Stalactite
- Granite Stalagmite/Stalactite
- Diorite Stalagmite/Stalactite
- Andesite Stalagmite/Stalactite
- Deepslate Stalagmite/Stalactite
- Tuff Stalagmite/Stalactite
- Sandstone Stalagmite/Stalactite
- Deep Sandstone Stalagmite/Stalactite
- Calcite Stalagmite/Stalactite
</details>
Update 1.1.0: Frosted Caves
IMPORTANT INFO:
This mod is a passion project that doesn't have a whole team behind it. We expect there to be bugs and we will try to fix them. The mod is still in active development and is planned to add more features. Other than that, enjoy our mod! ##
Recommended mods:
You should stock up on worldgen optimization mods, as this mod tends to slow it down a bit due to the added complexity. Here are a few:
FAQ:
Is there a config file?
As of update 1.1.0 there is.
Will you port to X mod loader?
No. We are going to currently use Forge for 1.20.1, although we are not opposed to do so in the future.
Where can I report bugs?
You can report in the issue tab.
Can I use this in my modpack?
Yes.
I have a suggestion, how do I suggest it?
You can suggest it in the issue tab with the suggestion tag.
About Subterranean Expansion:
Subterranean Expansion enhances the underground experience of vanilla caves by introducing new natural features and unique cave environments to bring you the cave update we all actually wanted.
Stalagmites & Stalactites:
Stalagmites and Stalactites of all vanilla stone variants, and even some custom stone variants.
Stalagmites & Stalactites
In Release 1.0.0:
- Stone Stalagmite/Stalactite
- Mossy Stone Stalagmite/Stalactite
- Granite Stalagmite/Stalactite
- Diorite Stalagmite/Stalactite
- Andesite Stalagmite/Stalactite
- Deepslate Stalagmite/Stalactite
- Tuff Stalagmite/Stalactite
- Sandstone Stalagmite/Stalactite
- Deep Sandstone Stalagmite/Stalactite
- Calcite Stalagmite/Stalactite
Update 1.1.0: Frosted Caves
IMPORTANT INFO:
This mod is a passion project that doesn't have a whole team behind it. We expect there to be bugs and we will try to fix them. The mod is still in active development and is planned to add more features. Other than that, enjoy our mod!
Recommended mods:
You should stock up on worldgen optimization mods, as this mod tends to slow it down a bit due to the added complexity. Here are a few:
FAQ:
Is there a config file?
As of update 1.1.0 there is.
Will you port to X mod loader?
No. We are going to currently use Forge for 1.20.1, although we are not opposed to do so in the future.
Where can I report bugs?
You can report in the issue tab.
Can I use this in my modpack?
Yes.
I have a suggestion, how do I suggest it?
You can suggest it in the issue tab with the suggestion tag.
Screenshots
Gallery
-
Stalagmites & Stalactites All stalagmites & stalactites in the mod. (V1.0.0) -
Resource Pack Compatible All vanilla stone based stalagmites and stalactites are compatible with resource packs. (Patrix 32x used in the image) -
Average Cave Cobblestone is spread throughout the stone with stalagmites & stalactites scattered. -
Desert Cave (Upper) Caves made of sandstone with patches of sand throughout. -
Desert Cave (Lower) The deepslate version of sandstone in the desert caves. -
2026-08-12_23.11.27.png New Stone Strip Generation -
2026-08-12_23.04.49.png Average Frosted Cave -
2026-08-12_23.09.25.png Glacier Spanning Many Chunks -
2026-08-12_23.06.42.png A Mineshaft Being Swallowed By A Glacier
-
Glacier Spanning Many Chunks -
A Mineshaft Being Swallowed By A Glacier -
Average Frosted Cave -
New Stone Strip Generation -
Stalagmites & Stalactites All stalagmites & stalactites in the mod. (V1.0.0) -
Resource Pack Compatible All vanilla stone based stalagmites and stalactites are compatible with resource packs. (Patrix 32x used in the image) -
Average Cave Cobblestone is spread throughout the stone with stalagmites & stalactites scattered. -
Desert Cave (Upper) Caves made of sandstone with patches of sand throughout. -
Desert Cave (Lower) The deepslate version of sandstone in the desert caves.
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