Subnautica 2 Early Access Story Walkthrough: The CICADA, the World Tree, and Where It Ends

Subnautica 2 launched into Early Access on May 14, 2026, and the first question almost everyone asks is the same. How much story is actually here, and can you beat it? Short version: there is a real, written story, you can play all of it, and it stops on purpose before any ending.

This walkthrough covers what the Early Access story is, the order of the major beats, and the exact spot where the current build hands you a cliffhanger instead of credits. Heavy story details are tagged so you can read the structure without spoiling yourself.

The setup, no spoilers

You wake up on the moon Proteus. The world is one enormous salty ocean wrapped around a core, orbiting a gas giant. The atmosphere is thick with xenon, which has a sedative effect on humans, so the surface is not a place you can just live on. The water itself is laced with heavy metals like lead, mercury, and arsenic, which is the in-universe reason your character keeps getting sicker the longer they stay.

You did not mean to be here. The colony ship that carried you, the AISV CICADA, was an Alterra vessel built to move 40,000 colonists on a fourteen-year trip to settle the desert planet Zezura. Partway there, the ship’s AI picked up an unknown signal, made an unscheduled phase jump on its own, and dropped the CICADA into a strange system where Proteus’s gravity caught it. The ship broke apart in the atmosphere. Why the AI did that, and why it still wants to keep going, is the hook the whole game hangs on.

If you are brand new, run through the beginners guide and the early game guide first, then come back here once you can build a Scanner and a first base.

How the Early Access story is structured

The full game is planned across a long chapter arc that Unknown Worlds will fill in over Early Access. What you can play today is the front section of that arc, broken into a handful of connected story stretches that move you out of the wreck and across the ocean.

The critical path runs through the broken pieces of the CICADA. You explore named wreck sections one after another, each one telling you more about what happened to the crew. The sections in the current build include Sleep Bay 3, EVA Suit Prep, Atmospheric Therapy, an Emergency Stairwell, Lifepod Holds 73 and 74, the Lander Garage, the Cargo Hold, and the Canteen. Recovering the data scattered across these spaces is your version of the old Blackbox hunt, and the Blackbox locations guide maps the recorders you need.

Side note for veterans: the older Chapter 1 walkthrough on this site was written early and refers to the crash site as Zezura. The wiki is now clear that Zezura was the intended destination and Proteus is where you crash and play. Use Proteus when you are talking about the actual world under your fins.

The story beats, spoiler-tagged

SPOILER WARNING. The rest of this section walks through the major story events in order. Skip to the next heading if you want to discover them yourself.

Your character is a Qualified Investigator, and you wake in Sleep Bay 3 roughly 25 years after the crash. You are not the first survivor. A community of pioneers tried to make a life here before you, and most of the story is you uncovering what happened to them.

The early beats cover the crash itself and the slow failure of their habitats. Then things get worse. A group called the Jubilee cult forms. A sickness named Masefield Syndrome breaks out, tied to something called the Proteavirus, and one survivor theory points the finger at the World Tree as the source. The salvager crew you hear about, led by a character named Zip, leaves a recorder in the graveyard caves that holds an access key for the Tadpole Pens, and recovering it is a major progression gate. That thread ends grimly, with the group falling to Masefield Syndrome.

The conflict escalates into open violence that culminates in the Old Habitat exploding. The back half follows a chase between two characters, Sophie and Nahema, heading toward the World Tree. Your own arc threads through this as you adapt to the moon using an organism called the Angel Comb, which is the in-fiction reason you can survive the water long enough to keep going. The adaptations guide covers how survival adaptation works in gameplay terms.

The playable arc closes on a single image. Your investigator steps out, and the World Tree dominates the horizon. That is the note the current build leaves you on.

Where it hard stops

Here is the part you want to plan around if you are starting a co-op run with a friend.

The World Tree is the obvious endpoint goal, a Titan-class organism roughly 2,400 meters north-northwest of your starting point. But in the current build it sits beyond the edge of the world border. You cannot reach it. Getting there means crossing the Great Trench to a region called Xanadu, and that crossing is locked behind a future update.

So the Early Access story is fully fleshed out right up to the moment it points you at the World Tree, then it just ends. There is no resolution, no final boss, no credits. Players who have finished the current content describe it as a clean wall: the writing is complete for what is here, and then it stops cold. That is normal for Early Access, but it is worth knowing before you treat this as a complete narrative.

Should you play the story now or wait?

If you want a finished, beginning-to-end story, wait. The arc here is genuinely good, but it is an opening act, and Unknown Worlds has said the rest arrives over roughly two to three years of Early Access updates. Coming back to a half-told story years later means re-treading old ground.

If you want to explore Proteus, scan creatures, build bases, and play the systems with up to three friends, jump in now. The survival loop is the strongest part of the package, and the co-op guide covers getting a crew set up. Just go in expecting a strong start and a deliberate stop, not a full ending.

For the dangers waiting between you and the World Tree, the all Leviathans guide covers every apex predator, and the Shiver Leviathan guide explains the one guarding the Void at the very edge of the map.