Subnautica 2 How Long to Beat: EA Story Length (2026)

Updated 2026-11-02: Rechecked HowLongToBeat: the completionist figure is now 30½ hours (10 runs), story and sides unchanged. Added the spread between rushed and relaxed players, the fastest speedruns, why other guides say 15 to 20 hours, and what the Early Access 2 update means for length.

Subnautica 2 playtime at a glance

These are player-submitted times from HowLongToBeat, read November 2, 2026, not a developer target. The label is HowLongToBeat's headline figure; its own "Average" column runs a little higher. Almost every submission is from PC: 97 of 100, with the fastest PC run at 8 hours and the slowest at 40. The three Xbox Series X/S submissions average 16 hours for the story.

The column worth reading is "Rushed": HowLongToBeat's rushed players finish the story in under 11 hours, and its leisure players take nearly 25. Our own pick for a first, unspoiled run is the median, 13 hours 20 minutes. It moves less than the average when one slow player logs 40.

Why other guides say 15 to 20 hours

Search for this and you'll see bigger numbers than ours. GameWith's guide (last updated July 21, 2026) says a standard playthrough takes "around 15 to 20 hours" and credits that to "details shared by the developers at Unknown Worlds". Insider Gaming wrote on launch day that there's "a solid 15 hours worth of content".

We couldn't find that developer number. Unknown Worlds' support page on playtime says "it's difficult to provide a specific number of hours", and none of the studio's 25 Steam posts from May 5 to October 22 gives one. Players in the launch-week Steam thread "how long is the gameplay" came in lower: "Around 10-14 hours i'd say. If you look anything up prior to going in it's going to cut it down by a tremendous amount," Aniaran wrote on May 15, and another reply put the story at "7 to 10 hours".

Our read: 15 to 20 hours is a fair number for story plus side content, and HowLongToBeat's 17½ hours for that playstyle sits inside it. As a story-only figure it's high.

What "beating" Subnautica 2 means right now

The story isn't finished; Unknown Worlds is still adding to it through Early Access. The current story pulls you east from the Lifepod, across the Collector Leviathan's trench in the Intermediary Basin, to the Overgrown Ruins. There you scan the Rosetta Stone, which lets you translate Axum writing, and its message points you at the Axum Observatory. The Observatory stays shut until you get the nearby Karakorum Power Plant running again, so most of the main-story hours go into gearing up for that trip: a seabase with a Fabricator, a Tadpole, and enough power to keep both going. Speedrunners agree on where the story stops: speedrun.com's main Subnautica 2 category is literally called "Observatory Ending".

The map stays open after that, and that's where the rest of your hours go: finishing scans, building a deeper base in Root Canyon, and chasing Biomods.

How fast can you beat Subnautica 2?

In well under an hour, if you're a speedrunner. These are the record Survival runs to the Observatory Ending for each rule set on speedrun.com, across all three Early Access versions, read November 2, 2026:

On the current version, 1.2 Buddy System, the only record so far is a 46:47 No Major Exploits run by GrongGrong on September 8.

Ignore the 4:50 as a measure of the game. The Glitched rules are "generally free for all to use any exploits and glitches", and the separate No Bypass set exists to ban "any early entry of the Observatory such as via clipping out of bounds". The 35-minute glitchless run is the useful number: it shows how much of a first run goes into finding the route rather than following it, and it backs up the Steam reply above about looking things up cutting the time "by a tremendous amount".

Screenshot: Subnautica 2 (Unknown Worlds)

How it compares to Subnautica and Below Zero

The story is the shortest of the three, but a completionist run already matches Below Zero. That gap says more about where Subnautica 2 is in development than about its final size: Unknown Worlds' Steam FAQ says it expects Early Access to take about 2 to 3 years, and its roadmap promises more world, creatures and story along the way. There's no date for the full release.

What adds hours past the story

Scanning. Every creature and Axum structure you scan fills the databank, and some unlock blueprints. A full scan sweep across the 13 current biomes is where most of the completionist time goes.

Biomods. Subnautica 2's DNA system turns scanned creatures into abilities like Sonic Echo or Chum Cloud. Our Biomod guide covers which ones are worth chasing; getting them all means visiting predators you'd otherwise avoid.

Base building. A first base in the Shallows is quick. A deep one is not: Solar Panels stop working below 200m, so a Root Canyon base needs another generator and Power Transmitters. Our deep-sea base guide walks through it.

Leviathans. Scanning the Shiver means crossing the Early Access barrier into the Void, where a female and three males appear the moment you arrive and a male breaks off to hunt you. Expect a few attempts and a few reprints at the Biobed.

Screenshot: Subnautica 2 (Unknown Worlds)

Does co-op make it longer?

Usually. Subnautica 2 supports up to four players (you and three friends), with cross-platform play. Nobody has published co-op times, and HowLongToBeat doesn't split them out. Groups lose time to regrouping and to deciding who builds and who explores, but they gain it back by doing both at once. A duo that splits the work can match a solo pace. Four first-timers on voice chat probably won't.

Two things help: one locker next to the seabase Fabricator as the shared materials bin, and one Tadpole with the Haul Chassis so the whole group travels together. Our co-op guide has the rest.

Will Early Access 2 make it longer?

Yes, by design, but there's no date or hour count. Unknown Worlds' May 15 roadmap says the next big drop "expands on the world, biomes, creatures, resources, tools, vehicles, and brings you the next chapter of the story". The two updates since launch didn't do that: 1.1 Adaptive Measures (July 8) was described as "a ton of quality-of-life fixes", and 1.2 Buddy System (August 19) added proximity chat, revives, emotes and trading. HowLongToBeat's main-story label is still the 13½ hours we recorded on October 14.

The studio started a "Voyage to Early Access 2" vlog series on October 15, and the October 22 episode covers "what's next for the Colonists' story" and how the update "connects back to the Collector Leviathan". Neither gives a release date. Our Early Access update tracker follows each post, and the Hotfix 3 and what's next breakdown covers the earlier patches.

Plan your Subnautica 2 playtime

1. Story only: two long evenings or one weekend. Follow the objectives, build a seabase Fabricator early, and head for the Overgrown Ruins once you have a Tadpole.
2. Story plus side stops: add an evening for the optional wrecks, Colonist Bunkers and the Great Jaw in the Dolerite Spires.
3. Everything: roughly double the story time. Most of that goes to scans, Biomods and a deep base.
4. Co-op: add slack for regrouping, and read our beginner guide together before the first session.

Here's the official look at what the latest update added, if you're deciding whether to start now or wait:

*Video: Early Access 1.2 Buddy System update vlog, Subnautica on YouTube*

Our take

Thirteen-odd hours of story for $29.99 (the Steam price on November 2, no discount running) works out to about $2.20 an hour, or under a dollar an hour if you go for the 30½-hour completionist run. That's fair for an Early Access survival game, and the hours after the story are where Subnautica 2 is at its best anyway. If you need a finished ending, wait; Unknown Worlds' own estimate puts that years away. If you like the building and scanning half of Subnautica, there's already a full day of game here, and our complete guide hub has everything else.

Frequently asked questions

How long is Subnautica 2 Early Access? About 13 and a half hours for the main story on HowLongToBeat (median 13 hours 20 minutes). Side content takes it to around 17 and a half, and a completionist run to about 30 and a half.

Is Subnautica 2 shorter than Below Zero? Yes, for now. Below Zero's main story averages 20 hours and the original Subnautica's is close to 30. Subnautica 2 is still in Early Access, so expect that to change.

Does co-op take longer than solo? Usually, though there's no official co-op playtime. A tight duo can match a solo pace; a first-time group of four rarely does.

When will Subnautica 2 leave Early Access? There's no date. The Steam FAQ says Unknown Worlds expects Early Access to take about 2 to 3 years.

Is Subnautica 2 on Game Pass? Yes. It launched in Xbox Game Preview on May 14, 2026, for PC, Xbox Series X|S and Game Pass.

Why do some guides say 15 to 20 hours? GameWith gives 15 to 20 and Insider Gaming said a solid 15. Unknown Worlds' support page gives no number, and HowLongToBeat's median story run is 13 hours 20 minutes, so 15 to 20 matches story plus side content better.

How we checked this

On November 2, 2026 we read HowLongToBeat's pages for Subnautica 2, Subnautica and Below Zero, the speedrun.com leaderboards and run pages, Unknown Worlds' support article on playtime, the Steam store data for price, all 25 Subnautica 2 posts in the Steam news feed (May 5 to October 22), the GameWith and Insider Gaming guides, and the launch-week Steam discussion thread. We haven't timed a run ourselves; every hour figure here is someone else's measurement, named next to it.

Related Reading

• Subnautica 2 Leviathan Guide: Avoid, Scan, Survive: patrol patterns and safe scanning.
• Subnautica 2 Vehicles Guide: the Tadpole, its chassis and depth modules.
• Subnautica 2 Lore Connections to Subnautica 1: the Architects, the Axum and what the Rosetta Stone says.
• Subnautica 2 Base Building Guide: your first seabase.

References

• HowLongToBeat: Subnautica 2: player-submitted playtimes
• HowLongToBeat: Subnautica and Subnautica: Below Zero
• Subnautica 2 on Steam: price, co-op, Early Access FAQ
• Xbox Wire: Subnautica 2 Coming to Xbox Game Preview on May 14
• Subnautica 2 Wiki: Rosetta Stone and Axum Observatory
• Unknown Worlds support: How long is the playtime?
• speedrun.com: Subnautica 2 leaderboards
• Subnautica 2 Early Access Roadmap (Unknown Worlds, Steam)
• Beyond the Surface: Voyage to Early Access 2 (Steam)
• Steam discussion: how long is the gameplay