Under The Seas
by FabCodes
Under The Seas is a NeoForge mod that adds a sea to explore, with the darkness of deep water as its main setting, along with new creatures.
What it does
The mod is built around exploring the sea, which is a different kind of space from the ordinary ocean in vanilla Minecraft. Players travel into dark water to find its contents. The server and every player need the mod installed. Files are published for NeoForge only, for 1.21.4, with 2.0.0 as the latest file released on 2025-09-14.
Key features
Darkness under the water
Deep sea areas are dark, so exploration there changes how players see and move through the water.
Many sea creatures
A large set of fish, sea mammals, and hostile and passive creatures lives in the new sea.
Shader support
The author notes that the mod works well with shaders, which can enhance the look of the underwater scenes.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
The Darkness Realm is a NeoForge mod for 1.21.1 – 1.21.4 that is also client and server, and it is all rights reserved. Azure Seas Worldgen mod is a NeoForge mod for 1.21.1 that is server-side only and released under the Apache License 2.0.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Under The Seas | NeoForge | 1.21.4 | Client and server | 2025-09-14 |
| The Darkness Realm | NeoForge | 1.21.1 – 1.21.4 | Client and server | 2024-12-10 |
| Azure Seas Worldgen mod | NeoForge | 1.21.1 | Server-side only | 2026-09-06 |
Questions
Does Under The Seas need to be installed on the server?
In the catalog
Under The Seas is one of 7,555 Cursed mods on ModsFinder, and one of 2,801 Cursed mods for NeoForge. 17,979 mods support Minecraft 1.21.4.
More from FabCodes
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What the author says
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
Official listing
- Modrinth page
- modrinth.com/mod/under-the-seas
- Owner
- FabCodes
- Published
- 2025-09-12
- Updated on Modrinth
- 2025-09-14
- Facts verified
- 2026-10-15