GameTimeline

Release & story order

Subnautica timeline

Subnautica from the 2018 1.0 launch through Below Zero (2021)—US full-release dates, Planet 4546B story chronology (Subnautica then Below Zero), early access history, and FAQ for standalone vs sequel play order and Subnautica 2.

Updated June 2026

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Release order Story order

Release order

When Unknown Worlds shipped each chapter—Subnautica 1.0 (January 2018) after years of Steam Early Access, then Subnautica: Below Zero 1.0 (May 2021). Early access start dates and console ports are FAQ-only—not extra Release rows.

  • Newcomers → Subnautica (2018) then Below Zero (2021)—same order for release and story
  • Below Zero alone is possible but spoils/weakens Subnautica mysteries
  • Historian → note Early Access 2014/2019 in FAQ—not separate story chapters
  • Console → both on Switch, PS4/5, Xbox—check current store bundles
Story order tips

One Alterra universe on Planet 4546B: Subnautica (Ryley Robinson in the main crash zone) → Below Zero (Robin in arctic Sector Zero). Release and story order match—play Subnautica first for Kharaa bacterium and Degasi lore payoff in Below Zero.

  • Core arc: Subnautica → Below Zero—4546B quarantine and Alterra threads continue
  • Subnautica is survival-horror ocean exploration; Below Zero adds cold biomes and land segments
  • Subnautica 2 is upcoming—FAQ only as of June 2026
  • On Story order, Below Zero may be hidden—reveal when ready or use Show all spoilers

Timeline

When each game was released. Click a game for platforms, dates, and where it fits in your playthrough.

Release order

  1. Subnautica

    Subnautica

    PCMacXbox OnePS4SurvivalMainline

    Ryley Robinson survives the Degasi crash zone—Kharaa and the void.

    Overview
    Unknown Worlds' underwater survival—base building, depth pressure, and environmental storytelling without combat focus.
    In-game setting
    Story on Planet 4546B: escape the Aurora crash and uncover what Alterra hid.
    Should you play it?
    Essential first chapter—still the franchise anchor on Steam and consoles.
    Release date
    US 1.0 launch January 23, 2018 (PC). Xbox One and PS4 August 2018. Switch May 2021. Early Access from December 2014—FAQ.
  2. Subnautica: Below Zero

    Subnautica: Below Zero

    PCMacSwitchPS4PS5Xbox OneXbox Series X|SSurvivalMainlineSequel

    Robin searches Sector Zero for sister Sam—ice caves and leviathans.

    Overview
    Sequel on the same planet—cold biomes, hoverbike, and more voiced narrative than the original.
    In-game setting
    Story follows Subnautica's broader 4546B timeline—Alterra and Kharaa threads continue.
    Should you play it?
    Play after Subnautica for full lore—marketed as standalone but best as chapter two.
    Release date
    US 1.0 launch May 14, 2021. Early Access January 2019. PS5/XSX updates later—FAQ for ports.

FAQ

Release vs story order, Below Zero placement, early access dates, and what's next.

Release order

For Subnautica they align: Subnautica (2018) → Subnautica: Below Zero (2021). Release order tracks US 1.0 launch dates; story order follows Planet 4546B fiction—Ryley's crash-zone survival first, then Robin's Sector Zero expedition. No prequel shuffle like Red Dead or BioShock.

Play Subnautica to completion, then Below Zero. Both are on Steam and modern consoles—often discounted together. Allow 25–40 hours for Subnautica, 15–25 for Below Zero. Use wikis sparingly; discovery is the point. Finish Subnautica before reading deep Below Zero lore guides.

Story & lore

Strongly yes for story order. Below Zero references Kharaa, Alterra, Precursors, and events from the first game. Unknown Worlds marketed Below Zero as playable standalone, but you lose mystery and emotional payoff. Release order and story order both say Subnautica first.

Below Zero started as an expansion then became a separate game with Robin as protagonist in Sector Zero—different map, new story. It does not reuse Ryley's save. You can play it alone, but Subnautica spoilers and missing context hurt the experience. Treat it as a sequel, not a substitute.

Unknown Worlds announced Subnautica 2—FAQ only, no firm release date as of June 2026. It continues the franchise after Below Zero. This page covers shipped 1.0 releases through Below Zero; Subnautica 2 gets a Release row when dated.

Versions & platforms

Optional & upcoming

More timelines

Other release-order and story-order guides on this site.