Subnautica 2 launched into Steam Early Access in May 2026 with a two-to-three-year runway before a full release. Unknown Worlds has been clear about the timeline: more biomes, more creatures, more narrative content, and a co-op mode that scales to four players. For anyone who is not in the mood to wait, the seven Subnautica 2 alternatives below cover the ground: other underwater survival games, co-op survival titles with a similar loop of build-and-explore, and single-player options that already ship the finished narrative Subnautica 2 is still writing.
Quick comparison
| Game | Best for | Free plan | Price | Standout feature |
|---|---|---|---|---|
| Subnautica: Below Zero | Original studio’s finished sequel | Demo | Standard indie price | Above-water and undersea mix |
| Raft | Co-op ocean survival with a lower barrier | Demo | Modest indie price | 4-player co-op from launch |
| Valheim | Norse-mythology open-world survival | No | Modest early access price | Boss-driven progression |
| The Forest | Peninsula survival with cannibal tension | No | Modest indie price | Cave systems and building |
| Sons of the Forest | The finished sequel with better AI | No | Standard indie price | Kelvin and Virginia companions |
| Barotrauma | Submarine simulation with crew roles | Demo | Modest indie price | Co-op crew management |
| Grounded | Backyard survival at Honey I Shrunk scale | Game Pass | Modest indie price | 4-player co-op with bug combat |
Why Subnautica 2’s early access frustrates fans
The 2-3 year runway means an incomplete narrative. Unknown Worlds has been transparent: the Early Access build ships biomes and creatures gradually, with major story beats landing over the next several updates.
Co-op is playable but not finished. Four-player co-op works, but ResetEra and Steam Community threads flag desync issues and missing progression sync between players.
Price rises at launch. The Early Access price sits below the eventual full-release tag. Some fans want to wait for the discount, others want to buy in early and support development.
The alternatives
Subnautica: Below Zero, best original studio’s finished sequel
Subnautica: Below Zero is the fully finished sequel to the original Subnautica, and it uses the same studio, engine, and design language Subnautica 2 is expanding. The story is complete, the biomes are all shipped, and above-water Arctic sections mix with undersea exploration.
Where it falls short: Single-player only. Shorter than the original Subnautica. Some players find the above-water sections weaker than the underwater ones.
Pricing:
- Free: Demo on Steam
- Paid: Standard indie price on Steam, GOG, and Epic
- vs Subnautica 2: Similar price, complete story
Migrating from Subnautica 2: No importer, but everything you learned in Subnautica 2 controls translates directly.
Bottom line: Pick Below Zero if you want the finished story now and can wait on Subnautica 2’s full release.
Raft, best co-op ocean survival with a lower barrier
Raft starts with a single wooden platform in an endless ocean and grows to a floating base with sails, engines, and expansion in every direction. Four-player co-op has worked since launch, the progression loop is faster than Subnautica’s, and the shark mechanic gives every early hour a tension the deep undersea game lacks.
Where it falls short: Simpler visual identity than Subnautica 2. No terrifying-creature reveal moments. Some players find the raft-building loop repetitive after 30 hours.
Pricing:
- Free: Demo on Steam
- Paid: Modest indie price on Steam
- vs Subnautica 2: Lower price, co-op is finished
Migrating from Subnautica 2: No importer. Different progression tree, but the ocean-and-build loop translates.
Download: Steam
Bottom line: Pick Raft if you want four-player ocean survival right now.
Valheim, best Norse-mythology open-world survival
Valheim is not underwater, but the survival-craft-boss loop is the closest cousin to Subnautica’s progression outside the ocean genre. Ten-player co-op, boss-driven biome unlocks, and a base-building system with weight and structural integrity make each server a shared project.
Where it falls short: No underwater exploration. Combat is stiff. Solo play is possible but the game shines with friends.
Pricing:
- Free: None
- Paid: Modest Early Access price on Steam
- vs Subnautica 2: Lower price, more mature Early Access
Migrating from Subnautica 2: No importer. Different genre, similar creative loop.
Download: Steam
Bottom line: Pick Valheim if you want an ongoing group survival project rather than a solo narrative.
The Forest, best cannibal-tension peninsula survival
The Forest dropped survivors on a wooded peninsula with cannibal mutants underground and above ground. Base building runs deep, cave systems reward exploration, and the story is complete. The tone is far more horror-forward than Subnautica.
Where it falls short: Older game, older engine. Combat is intentional but limited. Story is minimal.
Pricing:
- Free: None
- Paid: Modest indie price on Steam
- vs Subnautica 2: Lower price, complete story
Migrating from Subnautica 2: No importer. Different genre, transferable base-building instincts.
Download: Steam
Bottom line: Pick The Forest if you want horror-forward tension and a complete peninsula survival story.
Sons of the Forest, best finished sequel with better AI
Sons of the Forest is the direct sequel to The Forest, with drastically improved cannibal AI, richer base building, and companions who help gather materials and defend the base. It shipped out of Early Access into a fully polished 1.0 release.
Where it falls short: Still horror-heavy. Late-game combat can feel unfair. Steep hardware ask on max settings.
Pricing:
- Free: None
- Paid: Standard indie price on Steam
- vs Subnautica 2: Similar price, finished game
Migrating from Subnautica 2: No importer. Playing The Forest first is not required.
Download: Steam
Bottom line: Pick Sons of the Forest for a finished survival horror game with real companions.
Barotrauma, best submarine simulation with crew roles
Barotrauma is Subnautica’s darkest cousin. You crew a submarine under the ice of Europa, each player takes a role, captain, mechanic, medic, security officer, and each mission is a coordinated dive into hostile depths. The tension is different from Subnautica 2’s solo dread, but the underwater setting and creature encounters overlap heavily.
Where it falls short: Steep learning curve. Best with friends who commit to their roles. Visuals are 2D-side-view, not 3D.
Pricing:
- Free: Demo on Steam
- Paid: Modest indie price on Steam
- vs Subnautica 2: Lower price, co-op focus from launch
Migrating from Subnautica 2: No importer. Different perspective, same undersea genre.
Download: Steam
Bottom line: Pick Barotrauma if you have a group of friends and want submarine crew roleplay.
Grounded, best shrunk-down backyard co-op
Grounded shrinks four players to bug-size in a suburban backyard and builds a full survival crafting loop around bugs, weather, and honey-can bases. The tone is warm, the humor is intentional, and the four-player co-op has been mature since 1.0. Obsidian shipped multiple free content updates through 2025 and 2026.
Where it falls short: No underwater exploration. Combat scales weirdly at higher difficulties. Bug phobia is not helped by the setting.
Pricing:
- Free: Included in Game Pass on PC and Xbox
- Paid: Modest indie price on Steam
- vs Subnautica 2: Lower price outside Game Pass, longer complete campaign
Migrating from Subnautica 2: No importer. Different theme, familiar craft-and-explore loop.
Bottom line: Pick Grounded if you want polished 4-player co-op with a lighter tone than Subnautica’s dread.
How to choose
- Pick Subnautica: Below Zero if you want the same studio’s finished ocean game.
- Pick Raft if you want ocean co-op that works today.
- Pick Valheim if you want an ongoing group project with boss progression.
- Pick The Forest or Sons of the Forest if horror survival is the appeal.
- Pick Barotrauma if you have a crew of friends and want submarine roleplay.
- Pick Grounded for polished co-op with a warm tone.
- Stay on Subnautica 2 if you enjoy watching a game grow through Early Access and want to be there for each biome drop.
FAQ
When will Subnautica 2 leave Early Access? Unknown Worlds has said 2-to-3 years, so somewhere between 2028 and 2029.
Is Subnautica 2 worth buying in Early Access? If you like watching a game grow and are patient with unfinished stories, yes. If you want a finished narrative today, Below Zero is a better fit.
What is the best free Subnautica 2 alternative? Grounded on Game Pass is the strongest free option if you subscribe. Otherwise Raft and Below Zero both have Steam demos.
Which alternative has the best co-op? Grounded and Sons of the Forest are the smoothest four-player experiences. Raft was designed for it from launch.
Are there any single-player alternatives on this list? Below Zero and The Forest work well solo. The rest are strongest with friends.
