Is Subnautica: Below Zero co-op?

Not natively. Subnautica: Below Zero ships single-player; the community mod Nitrox adds co-op — Below Zero support is newer and less polished than base Subnautica.

Does Subnautica: Below Zero have PvP?

Only with the Nitrox mod, which is co-op only.

How many people play Subnautica: Below Zero?

About 698 players were in-game when this page was built (2026-09-08).

Ready Up — what game do we play?Compare two Steam libraries →

Multiplayer games › Survival › Sci-fi survival

Is Subnautica: Below Zero multiplayer? Yes — with Nitrox

Not out of the box — but the Nitrox mod makes it co-op. Subnautica: Below Zero is a sci-fi survival game released in 2021, 91% positive on Steam (96,660 reviews), with 698 playing right now. $7.49 on Steam.

Co-opSingle-player tooMultiplayer via mod: NitroxSurvival · Sci-fi survival

How to play Subnautica: Below Zero with a friend: Nitrox

Below Zero support is newer and less polished than base Subnautica. Steam lists Subnautica: Below Zero as single-player, so it won't show up in Steam's own "games we both own" view as something you can play together — Ready Up counts it anyway, marked "Via mod", and you can hide mod-only games with one filter if that's not your thing.

Get Nitrox

Dive into a freezing underwater adventure on an alien planet. Below Zero is set two years after the original Subnautica. Return to Planet 4546B to uncover the…

Steam tags: Open World Survival Craft, Survival, Underwater, Singleplayer, Open World, Horror, Exploration, Base-Building

Do you and a friend both own Subnautica: Below Zero?

Ready Up compares two Steam libraries and shows every multiplayer game you both have — including whether Subnautica: Below Zero is one of them — then helps you pick tonight's game with a weighted roll or a bracket.

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Tired of Subnautica: Below Zero? The Swap tab finds the closest unowned games of the same type that are newer or rated higher.

Quick answers

Is Subnautica: Below Zero co-op?: Not natively. Subnautica: Below Zero ships single-player; the community mod Nitrox adds co-op — Below Zero support is newer and less polished than base Subnautica.
Does Subnautica: Below Zero have PvP?: Only with the Nitrox mod, which is co-op only.
How many people play Subnautica: Below Zero?: About 698 players were in-game when this page was built (2026-09-08).

Ready Up is a free tool: enter two Steam usernames and it lists the multiplayer games you both own, runs a bracket to pick one, and suggests new co-op games that fit how you both play. Ratings, tags and player counts from Steam and SteamSpy; updated 2026-09-08. Powered by Steam — not affiliated with or endorsed by Valve Corporation.