Immersive Machinery ˣ Alex's Caves
by Urkaz
Immersive Machinery ˣ Alex's Caves is a Forge integration that lets the Copper Fin submarine from Immersive Machinery operate in the Hullbreakers depths biome of Alex's Caves.
What it does
The mod is a small bridge between Immersive Machinery and Alex's Caves. Without it, the Copper Fin submarine does not spawn or travel in the Hullbreakers depths biome. With it installed, the submarine can be used there, which lets players explore the biome by vehicle rather than on foot.
Damage that would hit a player seated inside the Copper Fin is redirected to the vehicle instead. The integration needs Alex's Caves, Immersive Aircraft and Immersive Machinery to be installed alongside it. Only the 1.20.1 build exists, on Forge, under the CC0 1.0 Universal license, and the source code is public.
Environment: both the server and every player need the mod, because the submarine behavior is shared between them. The project's notes say the confirmed dependency versions are Alex's Caves 2.0.2 and Immersive Machinery 0.2.0, and that newer or older versions may break compatibility.
Key features
Copper Fin in Hullbreakers
The Copper Fin submarine from Immersive Machinery can be used in the Hullbreakers depths biome of Alex's Caves.
Damage redirected to the vehicle
Damage applied to a player inside the Copper Fin is transferred to the submarine instead of the player.
Tested dependency versions
The mod lists Alex's Caves 2.0.2 and Immersive Machinery 0.2.0 as the confirmed working versions.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 3
How it compares
Dimensions of Alex's Caves JEI integration is a Forge mod for 1.20.1 – 1.20.6, client and server, and open source under the MIT License, so it covers a wider version range but adds recipe entries rather than submarine support. EC Alex's Caves Compat is a Forge mod for 1.20.1 only, client and server, and not open source under an All rights reserved license, covering a different set of compatibility fixes. Create: Oppenheimered is a Forge mod for 1.20.1, client and server, open source under the MIT License, and tied to Create rather than vehicles.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Immersive Machinery ˣ Alex's Caves | Forge | 1.20.1 | Client and server | 2026-04-07 |
| Dimensions of Alex's Caves JEI integration | Forge | 1.20.1 – 1.20.6 | Client and server | 2026-07-31 |
| EC Alex's Caves Compat | Forge | 1.20.1 | Client and server | 2025-04-29 |
| Create: Oppenheimered | Forge | 1.20.1 | Client and server | 2024-12-28 |
Questions
Which mods does Immersive Machinery ˣ Alex's Caves require?
Does the server need the mod?
Is this mod compatible with newer versions of the dependencies?
In the catalog
Immersive Machinery ˣ Alex's Caves is one of 19,031 Adventure mods on ModsFinder, and one of 10,478 Adventure mods for Forge. 34,764 mods support Minecraft 1.20.1.
More from Urkaz
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What the author says
A small integration mod between the mods "Immersive Machinery" and "Alex's Caves". The versions specified are the ones confirmed to work, newer or older versions may break the compatibility. If so, please notify me.
Official listing
- Modrinth page
- modrinth.com/mod/immersive-machinery-x-alexs-caves
- Owner
- Urkaz
- Published
- 2026-04-07
- Updated on Modrinth
- 2026-04-07
- Facts verified
- 2026-10-15