Video walkthrough
Watch the route, then match the frames
Video chapters
5 stepsVideo references
Watch or inspect the route before you dive
Click YouTube cards to load the player. Open frame cards to compare local screenshot notes. Use the evidence to confirm landmarks, movement, and encounter pacing, then follow the written checklist below.
Creature safety close-pass reference
Watch for: Close-pass behavior, hostile cue recognition, and how to avoid turning a resource route into a chase.
Close pass frame review
Watch for: Start with Creature safety reference / Marrowbreach threat at 01:36. Compare the screenshot cue, route note, and player action before following the guide in-game.
Hostile cue frame review
Watch for: Start with Creature safety reference / Marrowbreach threat at 00:24. Compare the screenshot cue, route note, and player action before following the guide in-game.
Official update checks
Patch notes that can change this guide
Video watch notes
What to pause, compare, and write down
Do not watch the video like entertainment only. Use these notes as a second-screen checklist: pause on landmarks, confirm the player action, then return to the written route.
Watchlist
Pause on Close pass and identify the landmark, depth band, or objective state before following the next step.
Use Hostile cue to confirm what changed; if the video only shows a close-up, rebuild the route from the previous landmark.
Treat Route risk as the exit rule: finish the objective, return, and update storage or crafting before adding side goals.
Close pass
A close pass means the guide should discuss spacing, tool readiness, and oxygen margin.
Action: Observe from outside attack range before trying to scan.
Hostile cue
Marrowbreach notes should teach the first behavior cue that turns a route unsafe.
Action: Use terrain to break line pressure when testing approach timing.
Route risk
Rate the threat by how it affects route repeatability, not only raw damage.
Action: Record the gap between warning behavior and attack commitment.
Video route timeline
Turn the video into playable checkpoints
Use this section like a second-screen route sheet. Open each checkpoint, compare the frame, do the action, then stop if your route no longer matches the video evidence. It keeps the guide useful even when Early Access shifts small placements or creature behavior.
01:36Checkpoint 1: Observe from outside attack range before trying to scan.A close pass means the guide should discuss spacing, tool readiness, and oxygen margin.Expand
Close pass
A close pass means the guide should discuss spacing, tool readiness, and oxygen margin.
Player action
Observe from outside attack range before trying to scan.
Proof before moving on
A close pass means the guide should discuss spacing, tool readiness, and oxygen margin.
Watch this timestampIf this fails
Reset to the last confirmed landmark or objective state, then repeat only the route-critical step.
00:24Checkpoint 2: Use terrain to break line pressure when testing approach timing.Marrowbreach notes should teach the first behavior cue that turns a route unsafe.Expand
Hostile cue
Marrowbreach notes should teach the first behavior cue that turns a route unsafe.
Player action
Use terrain to break line pressure when testing approach timing.
Proof before moving on
Marrowbreach notes should teach the first behavior cue that turns a route unsafe.
Watch this timestampIf this fails
Use the video frame as evidence, but record entry, proof, and exit as separate notes.
03:00Checkpoint 3: Record the gap between warning behavior and attack commitment.Rate the threat by how it affects route repeatability, not only raw damage.Expand
Route risk
Rate the threat by how it affects route repeatability, not only raw damage.
Player action
Record the gap between warning behavior and attack commitment.
Proof before moving on
Rate the threat by how it affects route repeatability, not only raw damage.
Watch this timestampIf this fails
Return, craft, sort storage, or retest the route before turning this page into a longer objective chain.
01:36Checkpoint 4: Leave immediately if damage feels tuned above your current gear.A close pass means the guide should discuss spacing, tool readiness, and oxygen margin.Expand
Close pass
A close pass means the guide should discuss spacing, tool readiness, and oxygen margin.
Player action
Leave immediately if damage feels tuned above your current gear.
Proof before moving on
A close pass means the guide should discuss spacing, tool readiness, and oxygen margin.
Watch this timestampIf this fails
Reset to the last confirmed landmark or objective state, then repeat only the route-critical step.
00:24Checkpoint 5: Compare notes after each hotfix rather than merging old and new behavior.Marrowbreach notes should teach the first behavior cue that turns a route unsafe.Expand
Hostile cue
Marrowbreach notes should teach the first behavior cue that turns a route unsafe.
Player action
Compare notes after each hotfix rather than merging old and new behavior.
Proof before moving on
Marrowbreach notes should teach the first behavior cue that turns a route unsafe.
Watch this timestampIf this fails
Use the video frame as evidence, but record entry, proof, and exit as separate notes.
Gameplay evidence
Screenshots to match before you keep swimming
Use these frames as visual checkpoints. If the terrain, lighting, or landmark does not match, slow down and re-check the route instead of forcing the next step.
Close pass
A close pass means the guide should discuss spacing, tool readiness, and oxygen margin.
Hostile cue
Marrowbreach notes should teach the first behavior cue that turns a route unsafe.
Route risk
Rate the threat by how it affects route repeatability, not only raw damage.
Route decision lab
Decide if this route is worth running now
This section turns the video into a practical in-game decision. Use it before leaving base, after the first landmark, and again before entering a deeper or darker area.
Route purpose
Do not memorize old Marrowbreach timing. Its damage and attack cadence have been patch targets, so plan around distance, cover, tool response, and build-specific field notes.
Visual checkpoint
A close pass means the guide should discuss spacing, tool readiness, and oxygen margin.
Map anchor
Marrowbreach Spacing Line in Deep predator spacing edge. Use it for use this to learn distance, turn radius, and cover before attempting scans or route crossings.
Abort rule
Trusting outdated attack cadence from a previous build.
Field manual translation
Do not memorize old Marrowbreach timing. Its damage and attack cadence have been patch targets, so plan around distance, cover, tool response, and build-specific field notes. Use this threat route manual as a second-screen checklist: identify the entry condition, confirm the objective with a visual proof point, then stop when the return rule is met. This keeps the article practical for Early Access patches without pretending every coordinate or state is final.
Primary job
Marrowbreach - Observe from outside attack range before trying to scan.
Best entry habit
Scanner - Use terrain to break line pressure when testing approach timing.
Stop condition
Trusting outdated attack cadence from a previous build. - Record the gap between warning behavior and attack commitment.
Patch-safe reading
Exact item positions can shift during Early Access. The useful part of this page is the route logic: what to prepare, what visual cue to confirm, what objective to finish, and when to turn back.
Updated
2026-06-12 / tracking / Early Access
What this guide covers
Requirements
- Scanner
- Mitigation tool
- Enough distance to observe
Use this if
You want a route you can follow from video evidence without needing exact official coordinates. The screenshots and steps are written to help you recognize areas, landmarks, and decisions while playing.
Early Access can move details. Treat this as a video-based walkthrough and verify landmarks in your own build.
Step-by-step walkthrough
Follow the video route without guessing
Observe from outside attack range before trying to scan.
Use this step as a route checkpoint, not as a promise that every object spawns in one exact coordinate. Match the landmark, compare the screenshot, then continue only if the return path is still clear.
If your game build looks different, stay with the same decision: keep oxygen safe, scan or collect the current blocker, and return before pushing into the next unknown area.
A close pass means the guide should discuss spacing, tool readiness, and oxygen margin.
Use terrain to break line pressure when testing approach timing.
Use this step as a route checkpoint, not as a promise that every object spawns in one exact coordinate. Match the landmark, compare the screenshot, then continue only if the return path is still clear.
If your game build looks different, stay with the same decision: keep oxygen safe, scan or collect the current blocker, and return before pushing into the next unknown area.
Marrowbreach notes should teach the first behavior cue that turns a route unsafe.
Record the gap between warning behavior and attack commitment.
Use this step as a route checkpoint, not as a promise that every object spawns in one exact coordinate. Match the landmark, compare the screenshot, then continue only if the return path is still clear.
If your game build looks different, stay with the same decision: keep oxygen safe, scan or collect the current blocker, and return before pushing into the next unknown area.
Rate the threat by how it affects route repeatability, not only raw damage.
Leave immediately if damage feels tuned above your current gear.
Use this step as a route checkpoint, not as a promise that every object spawns in one exact coordinate. Match the landmark, compare the screenshot, then continue only if the return path is still clear.
If your game build looks different, stay with the same decision: keep oxygen safe, scan or collect the current blocker, and return before pushing into the next unknown area.
A close pass means the guide should discuss spacing, tool readiness, and oxygen margin.
Compare notes after each hotfix rather than merging old and new behavior.
Use this step as a route checkpoint, not as a promise that every object spawns in one exact coordinate. Match the landmark, compare the screenshot, then continue only if the return path is still clear.
If your game build looks different, stay with the same decision: keep oxygen safe, scan or collect the current blocker, and return before pushing into the next unknown area.
Marrowbreach notes should teach the first behavior cue that turns a route unsafe.
After-action plan
What to do after the guide works
Bank the result
Compare notes after each hotfix rather than merging old and new behavior.
Clean the inventory
Move route-critical materials into labeled storage so the next dive starts with empty space and a clear job.
Pick the next guide
A conservative encounter hub for major threats, boss-like moments, escape planning, and Early Access verification.
Next route queue
Use these as the next blockers to solve after this route. Each queue card keeps the same evidence style: source video, gameplay frames, and a written checklist.
Best immediate follow-upBosses and Threats Overview
A conservative encounter hub for major threats, boss-like moments, escape planning, and Early Access verification.
Use if the route branchesHammerhead Threat Guide
A patch-tracking guide for Hammerhead behavior, Tadpole interactions, flare response, and safe escape routes.
Save for the next diveCreature Safety Index
A compact creature safety database for deciding whether to observe, avoid, scan from cover, or abort a route.
Detailed notes
Read spacing before reading stats
During Early Access, fixed numeric values are fragile. The useful player habit is learning how much room the encounter requires and what equipment changes the risk.
How to use this in-game
Turn this note into one action before leaving base: decide the objective, keep only the materials or tools that support it, then stop the route once the scan, pickup, or landmark is confirmed. This keeps the guide useful even when Early Access patches move small details.
What to capture in field notes
Useful Marrowbreach notes include build date, depth band, route type, warning behavior, mitigation used, and whether escape required vehicle support.
How to use this in-game
Turn this note into one action before leaving base: decide the objective, keep only the materials or tools that support it, then stop the route once the scan, pickup, or landmark is confirmed. This keeps the guide useful even when Early Access patches move small details.
Practical field read
Marrowbreach Threat Guide works best when you treat it as a threat read with a narrow job. Start with the loadout check: Scanner. Then follow the first action without adding side goals: Observe from outside attack range before trying to scan.. The page should help you recognize the behavior cue that tells you to approach, wait, or leave before you risk a longer dive. If the route starts producing unrelated discoveries, bank the note and return to the original objective instead of turning one guide into a full map sweep.
Loadout check: Scanner
Route check: Mitigation tool
First action: Observe from outside attack range before trying to scan.
Proof point: Marrowbreach
How to use this in-game
Turn this note into one action before leaving base: decide the objective, keep only the materials or tools that support it, then stop the route once the scan, pickup, or landmark is confirmed. This keeps the guide useful even when Early Access patches move small details.
How to turn this into the next dive
After the first proof point, decide whether the route is solved, blocked, or worth repeating. Use terrain to break line pressure when testing approach timing.. If it is solved, return and convert the result into crafting, storage, a map note, or the next related guide. If it is blocked, change only one variable: bring the missing tool, clear inventory, enter from a cleaner landmark, or wait for better oxygen and vehicle support. Record the gap between warning behavior and attack commitment.. Avoid the two habits that make this route feel unreliable: Trusting outdated attack cadence from a previous build.; Trying to scan while cornered..
How to use this in-game
Turn this note into one action before leaving base: decide the objective, keep only the materials or tools that support it, then stop the route once the scan, pickup, or landmark is confirmed. This keeps the guide useful even when Early Access patches move small details.
Video route notes
Marrowbreach Threat Guide should be followed as a threat route, not as a memory test. Start by watching the first route movement and naming the entry condition before copying the path in-game. Observe from outside attack range before trying to scan. Then pause again when the video reaches the first visible proof point, because that is where the guide changes from general advice into an action you can repeat. Use terrain to break line pressure when testing approach timing. If the route starts to feel different in your build, keep the same player goal: recognize the danger window before committing to the approach.
Entry check: Scanner
Route action: Observe from outside attack range before trying to scan.
Proof to look for: creature behavior proof
Version note: Early Access / tracking
How to use this in-game
Turn this note into one action before leaving base: decide the objective, keep only the materials or tools that support it, then stop the route once the scan, pickup, or landmark is confirmed. This keeps the guide useful even when Early Access patches move small details.
Screenshot checkpoints
Use screenshots as checkpoints instead of decoration. The first image should answer where the route begins, the second should show what confirms progress, and the third should explain what to do after the scan, pickup, puzzle state, or threat read is visible. Record the gap between warning behavior and attack commitment. This is especially important in Early Access because exact positions can drift while landmarks, depth bands, room states, and player decisions stay useful. A good screenshot lets you say, "I am at the right kind of place," before you risk oxygen, storage space, or vehicle safety.
Entry frame: match the landmark before moving deeper
Proof frame: confirm creature behavior proof
Exit frame: know the return direction before adding side goals
Loadout frame: check Mitigation tool
How to use this in-game
Turn this note into one action before leaving base: decide the objective, keep only the materials or tools that support it, then stop the route once the scan, pickup, or landmark is confirmed. This keeps the guide useful even when Early Access patches move small details.
Stop rule and next dive
The most useful part of this page is the stop rule. Trusting outdated attack cadence from a previous build. Trying to scan while cornered. When the objective is confirmed, return and convert it into progress: craft the upgrade, sort the material, save the route note, or mark the blocker as solved. If the route fails, do not repeat the same swim blindly. Change one variable at a time: enter from a clearer landmark, reduce inventory clutter, bring the missing tool, or wait until oxygen and vehicle support match the route. That turns a failed threat route into better field knowledge instead of another late retreat.
How to use this in-game
Turn this note into one action before leaving base: decide the objective, keep only the materials or tools that support it, then stop the route once the scan, pickup, or landmark is confirmed. This keeps the guide useful even when Early Access patches move small details.
Common mistakes
Trusting outdated attack cadence from a previous build.
Trying to scan while cornered.
Assuming increased damage means the route is impossible instead of later.
FAQ
Is this guide for the current Subnautica 2 build?
This page is written for Early Access and includes a visible update date. Treat exact values as tracking notes until the current build is field-tested.
Does this page use official screenshots?
Pages combine attributed official Steam / Unknown Worlds media, local gameplay frame captures, and source-video evidence cards. New player-submitted captures should keep the route, timestamp, and build context attached.
Community notes
Add a field report
Player reports enter a moderation queue. Approved notes can load from Supabase; pending drafts stay visible in this browser for follow-up.
Near starter shallows
Approx. 70-120m from pod
Confirm oxygen before leaving the first landmark. The route is much safer when you mark the return path before collecting side materials.
Guide-wide
N/A
Creature patrol ranges and fragment placement can shift between builds, so treat exact distances as field estimates until multiple players confirm them.