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Subterranean Expansion | Cave Update

Overhaul of underground caves in the overworld.
by Desblivion
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41,015 downloads
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Updated Jul 6, 2026
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Biomes Ores and Resources World Gen

Subterranean Expansion

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 of every stone type.

Stalagmites and Stalactites of all vanilla stone variants, and even some custom stone variants.

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 1.0.0: Desert Caves A desert cave made of sandstone with sandstone stalagmites and stalactites spread across the cave. Lowe level of desert caves lined with a dark sandstone called deep sandstone. Deep sandstone stalagmites and stalactites are spread across the cave.

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?

Not currently, planned for the future.

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.

sub_expansion-1.0.1-neoforge-1.21.1.jar
MC Client, NeoForge, 1.21.1, Server
Release 2025-09-24 Get
sub_expansion-1.0.1-forge-1.20.1.jar
MC Client, 1.20.1, Forge, Server
Release 2025-09-24 Get

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