A Subnautica Nightmare 2.2 2025 Upside-Down Update
🟡 Updated this year⚠️ Install Order · 2 steps
Install in this order, then this mod last — most mods fail to load without their framework and dependencies in place.
Preview

🔍 Analysis
- 👍 1.0% endorsement rate
- ✅ Updated 68 days after the latest game patch — actively maintained
- 🏆 #257 of 456 Gameplay mods in this game by downloads
📋 About This Mod
For the record, I began my Subnautica Nightmare series and zombie textures long before The Red Plague was even a thing, but since the release of TRP I realize these textures go really well with TRP so I'm releasing what I have so far and will be updating this mod more as time goes by to include every biome in the game. This mod changes up the textures of most flora/fauna (Includes the Zombie Reaper) in the safe shallows, and adds some creepy structure and terrain edits as well as adding a few additional Leviathan's nearby to make the safe shallows, NOT SO SAFE! This mod now comes with a dark shader, custom creations, and a bunch of updated biomes! It should be compatible still with The Red Plague for a truly terrifying experience. Using Lee23's biomefog command code, I was able to make bloody water! Only issue is that Bloody Water is not compatible with Spooky Subnautica, you will get really weird red effects so choose one or the other. It will be cloudy and lightning bolts the entire time, no normal sunshiny days.
Added: Zombie Reapers, Meteors, Lightning, Red sky, Spores, the Mind Flayer
Removed Tornados, Crustacen Infestation and Peeper Leviathans. These will be separate mods in the near future.
Future Ideas: I plan to build a maze of teleporters that will lead to either rewards or disaster. We will even have spatial rifts that will lead to a void dimension full of horrors. I also have ideas on how to make a whirlpool that will suck the player down into the void. Hallucinations, creepy sounds, and storyline will all be added at some point so stay tuned for updates!
To Install you will need Bepinex, Nautilus, Terrain Patcher(latest version)
Be sure to download The LATEST TERRAIN PATCHER, TERRAIN EXTENDER IS NO LONGER REQUIRED! Nightmare folder goes into the plugins folder like any other mod, and terrain edits for the hellmouths go into the TerrainPatcher/patches folder.
To get the full details regarding the storyline of this mod, and if you have not seen my Subnautica Nightmare story series, parts 1 and 2, please give them a view and Subscribe to my Youtube Channel: @leviathankraken
Part 1: https://youtu.be/TrVyoYL9_H0
Part 2: https://youtu.be/iWPwfeuFZkc
Please report any issues or glitched textures to me.
Known bugs:
I think Texture Replacer mod is getting cancelled out by this. Please let me know if this is confirmed.
Join my discord: https://discord.gg/aqyQ2v5ChVYou can also find me on Tik Tok: Leviathankraken10
FB: Leviathan Kraken
Instagram and Twitter: Leviathankraken
Donations accepted to help the channel!
https://www.paypal.com/donate/?hosted_button_id=SDM4MPF4UDYWU
Venmo + Ca$hApp: Leviathankraken
A texture pack and structure mod for Subnautica that adds infested zombie-themed visuals, terrain edits, and custom creations. Created by Leviathan Kraken for their Nightmare story series, it includes the 2025 Upside-Down Update with more updates planned. Small but active mod with 15 endorsements.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Unique horror theme that transforms Subnautica into a nightmare experience
- Actively maintained with a recent 2025 update
- Part of a video series, so you can see the mod in action before downloading
⚠️ Cons
- Low endorsement count (15) suggests a niche audience
- Potential compatibility issues with other mods due to terrain edits
For Subnautica players who want a horror twist and enjoy zombie-infested aesthetics. Perfect for fans of the author's Nightmare series. Skip if you prefer vanilla or non-horror experiences.
💡 Beginner Tips
- Check the author's video series to see how the mod looks and get context for the changes.
- Back up your save files before installing, as terrain edits can affect your world.
- Use a mod manager like Vortex to handle file placement and avoid conflicts.
📊 Mod Details
- Game
- Subnautica Mods
- Author
- Leviathan Kraken
- Version
- 2.2
- Downloads
- 1,516
- Endorsements
- 15
- Category
- Gameplay
- Created
- 11/24/2024
- Updated
- 12/10/2025
🔧 How to Install Subnautica Mods
Download from Nexus.
📖 Full step-by-step install guide for Subnautica →
Visit the official mod page for specific installation instructions for this mod.
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