Simple Submarines
Adds submarines for underwater exploration.
Screenshots
About this Mod
Simple Submarines adds two types of vehicles:
- Submarine - a small submarine, can carry up to 4 players.
- U-Boat - a large submarine, can carry up to 8 players.
The submarines allow you to breathe underwater and don't need any fuel, you can use them as much as you want! Bring your own night vision.
Available Versions
How to Install Simple Submarines on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set neoforge Loader
In the panel under "Egg", select the neoforge loader and matching Minecraft version (1.21.4).
Install Mod
Open the mod browser in the dashboard and search for "Simple Submarines". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.4
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Simple Submarines server crashes on startup – what to do?
Most common cause: wrong neoforge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.4). You can switch loaders with one click in the panel.
Is Simple Submarines compatible with neoforge?
Simple Submarines officially supports neoforge for Minecraft 1.21.4. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Simple Submarines – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Simple Submarines consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Simple Submarines with just one click on your server.