Under The Seas mod
Its a very lightweight mod were you can explore the sea, but, isn't minecraft sea is normal nothing fun there right? So i added A BUNCH of fishes, sea mammals, hostiles, pasives, and fantasys (it maybe don't make any sense, sorry). _ Better when using shaders_
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.4
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as reunder_the_seas-2.0.0-neoforge-1.21.4.jar — drop this file into the mods folder
- Download size: 44 KB
- Download link checked 21 Aug 2026 — working
These come from our own check of the pack file, not from the source page.