Is Subnautica: Below Zero co-op?

Not natively. Subnautica: Below Zero ships single-player; the community mod Subnautica: Below Zero Multiplayer adds co-op — A one-developer co-op mod for Below Zero (Nitrox does not cover it). Full release in 2025, still rougher than Nitrox.

Does Subnautica: Below Zero have PvP?

Only with the Subnautica: Below Zero Multiplayer mod, which is co-op only.

Do we both need to own Subnautica: Below Zero to play together?

Yes. Subnautica: Below Zero is played online, so each player needs their own copy on their own Steam account (or PC Game Pass where it is offered). Steam Families can share a library, but two people cannot play the same shared game at the same time.

How many people play Subnautica: Below Zero?

About 698 players were in-game when this page's data was last refreshed (2026-09-09).

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

Multiplayer games › Survival › Sci-fi survival

Is Subnautica: Below Zero multiplayer? Yes — with Subnautica: Below Zero Multiplayer

Not out of the box — but the Subnautica: Below Zero Multiplayer 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: Subnautica: Below Zero MultiplayerSurvival · Sci-fi survival

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

A one-developer co-op mod for Below Zero (Nitrox does not cover it). Full release in 2025, still rougher than Nitrox. 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.

Players: 2+
Modes: co-op
Status: Beta — playable, rough edges, expect bugs
You need: Windows only; one player hosts
Price: Free

Get Subnautica: Below Zero Multiplayer All 77 games with multiplayer mods →

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…

How Subnautica: Below Zero plays with friends, according to Steam

Online co-op: Not listed on Steam
Local / split-screen co-op: Not listed on Steam
Online PvP: Not listed on Steam
LAN play: Not listed on Steam
Single-player mode: Yes
Controller: Full controller support

Steam's own category list for the game, as of 2026-09-09. "Not listed" means the store page does not claim that mode; community mods or Remote Play can still add it.

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.

Or open the Steam store page.

Games like Subnautica: Below Zero you can play together

No Man's Sky

Sci-fi survival · 83% positive on Steam (352,858 reviews) · 12,291 playing right now

Space Engineers

Sci-fi survival · 89% positive on Steam (132,347 reviews) · 4,201 playing right now

Subnautica

Sci-fi survival · 97% positive on Steam (313,707 reviews) · 2,719 playing right now

Starbound

Sci-fi survival · 92% positive on Steam (164,906 reviews) · 894 playing right now

ASTRONEER

Sci-fi survival · 92% positive on Steam (128,956 reviews) · 988 playing right now

Cubic Odyssey

Sci-fi survival · 72% positive on Steam (1,509 reviews) · 429 playing right now

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 Subnautica: Below Zero Multiplayer adds co-op — A one-developer co-op mod for Below Zero (Nitrox does not cover it). Full release in 2025, still rougher than Nitrox.
Does Subnautica: Below Zero have PvP?: Only with the Subnautica: Below Zero Multiplayer mod, which is co-op only.
Do we both need to own Subnautica: Below Zero to play together?: Yes. Subnautica: Below Zero is played online, so each player needs their own copy on their own Steam account (or PC Game Pass where it is offered). Steam Families can share a library, but two people cannot play the same shared game at the same time.
How many people play Subnautica: Below Zero?: About 698 players were in-game when this page's data was last refreshed (2026-09-09).

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; page updated 2026-09-23. Powered by Steam — not affiliated with or endorsed by Valve Corporation or Microsoft. Ready Up is a Somebody Decide program. How the data works · Legal & privacy · All types · Game Pass