Top 10 Subnautica Mods on OpenMods, May 2026

Subnautica modding has had a strange 2026. The community had its toolchain stabilised for years on BepInEx + Nautilus, then Unknown Worlds shipped Subnautica 2.0 in late 2024 and broke a meaningful chunk of it. Most of what's on OpenMods today is post-2.0 work — either updated framework mods or new content built on top of the refreshed stack. This is a tour through the catalog as it stands in May 2026, organised the way you'd actually install them: foundations first, then the experiences on top.

If you haven't installed anything before, start with the Subnautica landing page for the install primer — this article assumes you already have a Subnautica install you don't mind tinkering with.

The toolchain (install these first)

1. BepInEx

The plugin loader every other C# mod runs through. Unity/XNA game patcher and plugin framework — generic, not Subnautica-specific. If you only know it from one game's modding scene, it's the same BepInEx running on Valheim, Lethal Company, and a dozen others.

2. Tobey's BepInEx Pack for Subnautica

A Subnautica-specific BepInEx distribution by tobey — preconfigured, ready to use on Windows, macOS, and Linux including SteamOS. If you've been trying to set up BepInEx by hand and getting frustrated, swap to this. It's the single highest-leverage download for a new modder.

3. Nautilus (formerly SMLHelper)

The Subnautica modding API itself. Wraps the game's internals into something mods can actually call without reinventing every helper. Required by most content mods — read the dependency list on any mod you install and assume Nautilus is in it.

4. Harmony

Andreas Pardeike's runtime patching library. Lets BepInEx plugins replace, prefix, and postfix methods at runtime. You won't install Harmony directly very often — it ships bundled with BepInEx — but every C# mod's source assumes it exists.

Frameworks and editors

5. Subnautica-TerrainPatcher

A library by Esper89 that lets any mod modify the game's terrain — works for both Subnautica and Below Zero. The technical foundation for the wave of "alternative terrain" mods coming through the community.

6. AbyssEditor

A terrain editor (specifically: an optoctreepatch editor) for Subnautica and Below Zero, by BeneathTheWaves. Mostly used by mod authors rather than players, but worth knowing about — if a content mod adds a new biome, it was probably built with this.

7. Subnautica-Mod-Template

A modern, opinionated starter kit for Subnautica mod development by matthewdowns. Modular structure, sensible defaults, practical examples. If you're writing your first mod, fork this rather than starting from a blank .csproj.

Content and experience mods

8. SubmersedVR

By Okabintaro. Aiming for full motion-controller support and the usual VR mechanics in vanilla Subnautica. The most ambitious experiential mod in the catalog — Subnautica is already excellent in VR through the official build, and SubmersedVR is the community's iteration on top of that.

9. Nitrox

Open-source multiplayer modification for Subnautica by the SubnauticaNitrox team. Years of work, large active community. Subnautica is a single-player game by design, and Nitrox is the answer to "but what if it wasn't." Note: install at your own risk on a save you care about — multiplayer in a game designed for solo play does interesting things to NPC behaviour.

10. Deathrun-Remade

A roguelike difficulty mod by tinyhoot. The original Deathrun was a Subnautica modding classic; the "Remade" version updates it for the 2.0 era. Drops you into Subnautica with permadeath, harsher resource economies, and meaner creature behaviour. If "Survival" mode has lost its edge for you, this is the answer.

Honourable mentions

A few catalog entries that don't fit the top 10 but are worth bookmarking:

• Pickup Full Carryalls (Updated for 2.0) — small QoL mod that lets you grab a full carryall as one item. Updated specifically for the 2.0 patch.
• HighTide's Supercompacted Items — pack more into every inventory slot. Counterbalances Deathrun's harsher economies.
• AD3D StorageSolution & EnergySolution — buildable-menu additions for storage and energy, by the same author (full disclosure: this is the OpenMods team).
• I-Am-Peeper — play Subnautica as a Peeper. Exactly as silly as it sounds. The kind of mod that exists because Subnautica's community is the kind of community where this exists.
• SlightlyNerfedCreatures — every creature now has 1 HP. The author's "slightly" disclaimer is doing a lot of work.

A note on stars and download counts

You might notice most mods in the catalog show 0 stars. OpenMods went live in early 2025 and the star/download counters are still warming up — most authors haven't asked their communities to migrate over from Nexus or the Steam Workshop yet. None of that affects mod quality. Treat the catalog as "what's freshly published from GitHub" rather than "what has the most votes" — and check back monthly, because new releases are showing up every couple of days.

If you've published a Subnautica mod somewhere else and want a GitHub-backed second home for it, the publishing guide walks through the connection flow.