Flooded Nether
by kuylar
Flooded Nether replaces the air pockets of the Nether with water, so the caverns that players breathe in while crossing fortresses and bastions fill up instead.
What it does
Minecraft places small air-filled spaces inside Nether Fortresses and Bastions, and Flooded Nether swaps those spaces for water. Chunks generated after the mod is installed fill with water, and chunks created earlier are flooded when they load. Removing the mod causes newly generated chunks to stop being flooded.
The change is purely about terrain. Lava oceans are left as they are, and water placed next to a lava ocean can cause lag, which the author asks players to avoid by keeping blocks away from that boundary. Fish, dolphins and turtles can spawn in the new water inside the Nether, so the underground areas gain marine life that vanilla does not give them.
The mod is published for Fabric only, for Minecraft 1.20.1 alone, and it is open source under the GNU Lesser General Public License v3.0 only. It runs on the server side only, so players join without installing it, and Flooded Nether requires no other mod.
Key features
Water in Nether pockets
Air pockets inside Nether Fortresses and Bastions are replaced with water rather than remaining as breathable air.
Flooding of existing chunks
Older Nether chunks that were generated before installation are flooded with water once they load.
Marine mobs in the Nether
Fish, dolphins and turtles spawn inside the flooded Nether areas.
Lava ocean caution
The author notes that placing blocks right next to a lava ocean can cause lag, so the boundary should be left alone.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners who want Nether structures to be flooded and players who enjoy an unusual underground environment.
How it compares
Pocket Air is a Fabric mod for 1.21.10 – 26.2 that runs on the client and server, is not open source and is licensed as All rights reserved. Inundated is a server-side only Fabric mod for 1.21.4 – 1.21.8, open source under the GNU General Public License v3.0 or later. Nether Water is a server-side only Fabric mod for 1.21.3 – 26.2, open source under the Apache License 2.0, so it covers newer versions than Flooded Nether.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Flooded Nether | Fabric | 1.20.1 | Server-side only | 2023-07-30 |
| Pocket Air | Fabric | 1.21.10 – 26.2 | Client and server | 2026-07-23 |
| Inundated | Fabric | 1.21.4 – 1.21.8 | Server-side only | 2025-04-24 |
| Nether Water | Fabric | 1.21.3 – 26.2 | Server-side only | 2026-08-24 |
Questions
Does Flooded Nether need to be installed on every player's client?
Do chunks already generated before installing Flooded Nether change?
Which Minecraft version does Flooded Nether support?
Can the mod be removed later?
In the catalog
Flooded Nether is one of 7,555 Cursed mods on ModsFinder, and one of 4,235 Cursed mods for Fabric. 34,764 mods support Minecraft 1.20.1.
More from kuylar
Similar mods
What the author says
A mod that replaces (almost) every single air pocket in the nether with boiling hot water. Don't worry, you won't burn in it. Already generated nether chunks will not fill with water. If you remove this mod, then newly generated chunks will not fill with water.
Official listing
- Modrinth page
- modrinth.com/mod/flooded-nether
- Owner
- kuylar
- Published
- 2023-07-30
- Updated on Modrinth
- 2023-07-30
- Facts verified
- 2026-10-15