Subnautica 2 Walkthrough: Complete Chapter 1 Progression Guide

Chapter 1 Overview

Subnautica 2 tells its story across 10 planned chapters. Chapters 1 through 3 shipped with Early Access, with the remaining chapters arriving through updates over a two-to-three-year development window. Chapter 1 alone runs roughly 8-10 hours if you follow the main story. Completionists hunting every fragment, scanning every species, and building elaborate bases should expect 15-20 hours per chapter.

The core story in Chapter 1 revolves around the Blackbox Recovery mission. Your crew’s ship broke apart during planetfall on Zezura, scattering Blackbox recorders across the ocean. Each Blackbox belongs to a different crew member, and recovering them in sequence reveals what happened during the crash and sets up the larger narrative.

This walkthrough covers the critical path. Side exploration is encouraged, but I’ll keep the focus on what you need to do to reach the Chapter 1 ending.

Phase 1: Survival Basics (0-30 Minutes)

Lifepod to Scanner

You start in your Lifepod on the ocean surface. The Fabricator is your only crafting station. First move: gather materials for a Scanner.

Dive below the Lifepod. Break limestone outcrops for Titanium and Copper. Collect Quartz crystals from the seafloor. You need 2 Titanium, 2 Quartz, and 1 Basic Battery.

Build the Scanner at the Fabricator. This unlocks the ability to scan fragments and materials, which is how every blueprint in the game gets discovered.

Note Your Coordinates

Open the pause menu. Your XYZ coordinates are displayed. Write down the Lifepod position. There is no map. Coordinates are your lifeline.

Immediate Crafting Priorities

After the Scanner:

Survival Knife — harvesting and basic defense
Compass — stops you from swimming in circles
Flashlight — you’ll need it within the hour

Phase 2: The Welcome Center (30-60 Minutes)

Finding the Welcome Center

Head southeast from your Lifepod, roughly 85-90 meters. The Welcome Center is a partially intact structure on the seafloor. It serves as a guided tutorial space with supply caches, data logs, and your first scannable technology fragments.

Scan everything inside. The data logs here introduce the crew members whose Blackboxes you’ll be chasing. Pay attention to the names — Anita, Chap, Tuba, Quaker, Wander, Zip, and Iso. You’ll be visiting their crash sites in order.

Pick up any supplies. Emergency food rations are here, and you need them because of your Digestive Incompatibility (more on that shortly).

Digestive Incompatibility

You cannot eat alien food at the start. Your body rejects everything from Zezura. To fix this, you need to find an Angel Comb — a massive pylon-like structure located approximately 150-200 meters north-northeast of the Lifepod. Swim to it and interact with the central pink bulb to permanently unlock the Digestion adaptation.

This is a priority objective that runs parallel to the Blackbox mission. The Angel Comb is hard to miss once you’re in the right area — look for tall glowing pink stems rising from the seafloor.

Phase 3: First Blackboxes (1-3 Hours)

The Blackboxes must be recovered in a specific order. Each one sends a signal you can follow once the previous one is retrieved. Here’s the sequence with locations:

Blackbox 1: Anita

Direction: Northeast of Lifepod Biome: Kelp Forest (shallow)

Anita’s Blackbox is the closest and easiest to reach. Follow the signal northeast from the Lifepod. It’s in the upper Kelp Forest, no deeper than 30-40 meters. Grab the Blackbox, listen to the audio log, and the signal for the next one activates.

Blackbox 2: Chap

Direction: South-southeast of Lifepod Biome: Kelp Forest edge

Chap’s site is south-southeast. Still manageable depth, still within safe territory. The wreckage is more scattered here — scan any fragments you find. There are often Habitat Builder fragments in crash debris, and you need 2 of those to unlock base building.

Blackbox 3: Tuba

Location: Camp One, approximately 240m NE of Lifepod (compass heading 60) Biome: Kelp Forest / Coral Gardens transition

Camp One is a significant location. It’s a semi-established camp with storage containers, data logs, and crafting supplies. Tuba’s Blackbox is here along with additional story context about what the crew was doing before the crash.

Take your time at Camp One. Scan everything. Stock up on supplies. This is roughly the point where you should have cured your Digestive Incompatibility and started eating local food.

Phase 4: Base Building (3-5 Hours)

Unlocking the Habitat Builder

By now you should have scanned 2 Habitat Builder fragments. If not, check the Old Habitat — roughly 350 meters north of the Lifepod. This abandoned base consistently has the fragments you need.

Once unlocked, build your first base. Place it somewhere between the Lifepod and Camp One for convenience. You need:

Foundation or basic room module — structural starting point
Hatch — entry/exit
Solar Panel — generates 1-8 energy per second depending on sunlight
Fabricator — so you don’t have to swim back to the Lifepod

The sculptural extrusion building system in Subnautica 2 is freeform — not locked to a grid like the original. Rooms curve and flow into each other. It looks great but takes some getting used to. Don’t stress about aesthetics yet. Function first.

Power Setup

For a starter base, Solar Panels are enough. Place them on top of your base or on the surface above it. They produce 1-8 energy per second depending on depth and time of day. Two or three panels will handle a Fabricator and basic lighting.

Later you’ll want Hydroelectric generators (12 energy/sec in currents) or Thermal generators (16 energy/sec near volcanic vents) for deep bases, but that’s Phase 5 territory.

Phase 5: Deeper Exploration (5-7 Hours)

Blackbox 4: Quaker

Location: Old Habitat, approximately 350m N of Lifepod Biome: Kelp Forest / deeper transition

If you already visited the Old Habitat for fragments, you might have noticed Quaker’s Blackbox signal nearby. Return here with better equipment. The surrounding area starts transitioning to deeper, more dangerous biomes.

Blackbox 5: Wander

Location: Colonist Bunker, approximately 280 meters southwest of Lifepod Biome: Mid-depth transition zone

Wander’s Blackbox is at the Colonist Bunker, about 280 meters southwest. This is where the story’s tone shifts. The bunker sits at a moderate depth and the surrounding area starts getting more dangerous. Bring a Survival Knife and extra food/water. The depth requires better oxygen management — an upgraded tank helps significantly.

The Colonist Bunker is worth exploring thoroughly. There are blueprints and data entries scattered throughout the interior. Don’t just grab the Blackbox and leave.

Building the Tadpole

Between Blackboxes 5 and 6, you should be building toward the Tadpole — Subnautica 2’s first vehicle. You need to find and scan 3 Tadpole fragments. These appear in wrecks and debris fields, most commonly in the Coral Gardens and around established camps.

The Tadpole has 3 chassis variants, though only two are craftable in the current Early Access build:

Haul — cargo-focused, extra storage, slower
ScoutRay — fast, light, for covering distance
Seafrog — an exosuit-style walker (coming in a later Early Access update, no recipe yet)

Pick based on your playstyle. ScoutRay is fastest for story progression. Haul is best if you’re building extensively. You’re not locked in permanently.

Phase 6: The Final Blackboxes (7-10 Hours)

Blackbox 6: Zip

Location: Hot Caves, roughly 200-300 meters southwest of the Tadpole Pens Biome: Hot Caves (volcanic, ~310m depth) Requires: Heat Tolerance Adaptation, Tadpole vehicle, Rebreather

This is where the game gates you hard. Zip’s Blackbox is in the Hot Caves — an underground volcanic cave system at around 310 meters depth. You need the Heat Tolerance Adaptation before attempting this trip, plus a Tadpole vehicle for the journey and a Rebreather for the cave depths.

The Hot Caves introduce new environmental hazards and fauna. Bring supplies. Drop Beacons along your route so you can find your way back.

Blackbox 7: Iso

Location: Alien Ruins Biome: Alien Ruins (mid-depth, lore-heavy)

The final Blackbox of Chapter 1. Iso’s recorder is in the Alien Ruins — a biome filled with ancient structures from a non-human civilization. This area is story-critical and visually distinct from everything else you’ve seen.

The Alien Ruins have unique scannable objects that expand the lore significantly. Take the time to scan everything. The data logs here set up the larger mystery that later chapters will explore.

Recovering Iso’s Blackbox triggers the Chapter 1 ending sequence.

Chapter 1 Ending

After collecting all 7 Blackboxes, you’ll get a final story sequence that reveals the full picture of the crash. I won’t spoil the specifics, but expect plot threads left deliberately open — this is Chapter 1 of 10.

The game doesn’t lock you out of the world after the chapter ends. You’re free to keep building, exploring, and moving into Chapter 2 content.

Quick Reference: Blackbox Order

#	Crew Member	Direction	Distance	Biome
1	Anita	NE	Short	Kelp Forest
2	Chap	SSE	Short	Kelp Forest edge
3	Tuba	NE (heading 60)	~240m	Camp One
4	Quaker	N	~350m	Old Habitat
5	Wander	SW	~280m	Colonist Bunker
6	Zip	SW of Tadpole Pens	~310m depth	Hot Caves
7	Iso	—	Deep	Alien Ruins

Tips for a Smooth Playthrough

Build the Scanner before anything else. You cannot progress without scanning fragments.
Cure Digestive Incompatibility by Phase 3. Running out of emergency rations mid-mission is brutal.
Drop Beacons at every Blackbox location and every significant wreck. You’ll revisit some of these areas.
Build the Tadpole and get Heat Tolerance before attempting Blackbox 6. The Hot Caves at 310 meters depth require both a vehicle and the adaptation.
Scan the Alien Ruins thoroughly. The lore here feeds directly into later chapters.