Get around faster in Subnautica 2 — a deliberately conservative UE4SS Lua mod that boosts your swim speed and the Tadpole's speed, configured in-game via SN2ModSettings. Built with clipping safety in mind: speeds are capped where the game (and physics) stay happy.
| Toggle | Effect |
|---|---|
| Faster Swimming | Swim at the game's natural max-swim speed (~2×) without needing fins equipped. Fins and the Wakemaker still stack on top. Off = vanilla. |
| Faster Tadpole | Increases the Tadpole's acceleration → higher cruising speed (2×). Off = vanilla. |
Simple ON/OFF — flip a toggle off and the vanilla value is restored.
The effect is binary. Subnautica 2 soft-caps swim speed at roughly 2× base (the ceiling you'd hit with Improved Fins + Wakemaker) — push past it and the game just clamps you, and higher speeds start clipping through terrain and outrunning world streaming. So there's nothing meaningful between "vanilla" and "the ceiling" — a toggle says exactly that. The Tadpole is held to 2× for the same safety reason: fast vehicles punch through geometry far more easily than a swimming player.
Movement is server-authoritative, so this works in single-player and for the host of a co-op session. Joining players won't see the effect on their own movement.
- Make sure UE4SS is installed (
dwmapi.dllnext toSubnautica2-Win64-Shipping.exe,ue4ss/folder beside it). - Extract this archive so the
SN2PropulsionTweaks/folder lands in:<game>\Subnautica2\Binaries\Win64\ue4ss\Mods\ - Add this line to
ue4ss\Mods\mods.txt:(loads it before SN2ModSettings so it appears in the settings UI; otherwise just restart once).SN2PropulsionTweaks : 1 - Launch → Settings → Mods → Propulsion Tweaks.
| Aspect | Target | Method |
|---|---|---|
| Swim speed | UWEMovementSetComponent:SetBaseSwimSpeed() |
Proper setter UFunction, applied only to the local player pawn's component (matched by owner, so creatures aren't sped up). ×2 when on, ×1 (vanilla) when off. |
| Tadpole speed | UWESubmersibleMovementComponent.MaxSwimAcceleration |
Direct write. Higher acceleration → higher thrust-vs-drag top speed. ×2 when on, ×1 when off. |
Vanilla base values are snapshotted once so toggling off cleanly restores the original. Deliberately not touched: creatures, swimming friction, turn rate, water currents.
- UE4SS — ported for Subnautica 2 by the Subnautica2Modding group.
- SN2ModSettings by Just-Chaldea — the in-game slider UI.
- ConfigManager pattern adapted from Capacity & QuickBar Tweaks by iTestor.
MIT — see LICENSE.
- Added Nexus + GitHub metadata so SN2ModSettings shows "View on Nexus" / "View on GitHub" buttons. No gameplay changes.
- Simplified to ON/OFF toggles. The effect is binary (the game soft-caps swim speed at ~2×), so the 1–2× sliders were redundant with the enable toggles.
- Toggling off now cleanly restores the vanilla value.
- Initial release: player swim speed and Tadpole speed via SN2ModSettings sliders. Conservative caps for clipping safety.