Quick answer
Make and carry the Scanner early. Scan fragments, stations, alien-route objects, and anything that looks like it belongs in a recipe chain before filling your inventory with loose loot. PC Gamer places the Bioscanner in Cicada wreckage about 500m southeast of the Alien Ruins Research Outpost, around bearing 130, and notes that earlier lifeform scans do not count retroactively.
Field notes for scan routes
Fragments beat loose loot
A full bag feels good for five minutes. A missed fragment costs another whole trip. When you enter wreckage or a worksite, scan first and tidy the inventory later.
Do not scan at panic oxygen
Scanning makes you stop moving and stare at the thing instead of the exit. If the oxygen warning is already loud, mark the spot in your head and come back with a cleaner route.
Bioscanner is a second pass
Lifeform scans become more important once the Bioscanner is in your kit. Treat that as a planned revisit, not a reason to chase every creature before you are ready.
Scanner priority route
Craft the Scanner before long routes
Copper matters here because the Scanner depends on the early battery and electronics chain. If you leave base without it, every interesting fragment becomes a second trip.
Scan before you loot
At wreckage, stations, and alien structures, scan first. Inventory loot is replaceable; missed blueprint progress is what quietly slows the next hour.
Separate blueprint scans from Biomods
The regular Scanner pushes tools, stations, and vehicle progress. Bioscanner is later, and PC Gamer reports it lets marine-life scans unlock extra Biomods. Re-scan important lifeforms after getting it because old scans are not credited backward.
Do not rush the Cicada wreck unprepared
The Bioscanner lead sits far enough from the Alien Ruins Research Outpost that oxygen and landmarks matter. Put a Beacon or route note on the outpost side before swimming southeast.
Use oxygen planning for slow scans
Scanning takes calm seconds you may not have in a cave. Pair scan routes with Air Bladders, air pockets, or a tank upgrade instead of forcing one last scan at 10 O2.
Scan priority card
First
Fragments
Tools, stations, and vehicle pieces are the first scans that change your route.
Next
Systems
Alien-route objects and production stations often open the next crafting step.
Later
Biomods
Use Bioscanner when marine life starts feeding your upgrade plan.
What to scan first
| Target | Why it matters |
|---|---|
| Tool fragments | They unlock the gear that makes every later route shorter. |
| Stations | Processing and production systems can change what you are able to craft. |
| Vehicle fragments | They move you from swimming routes toward vehicle routes. |
| Alien-route objects | These often point to the next story or upgrade path. |
| Marine life | With Bioscanner, lifeform scans can contribute to Biomod progression, but earlier scans may need to be repeated. |
Scanning is not optional
Exploring without a Scanner is mostly sightseeing. If you see fragments, stations, alien tech, or new organisms, scan first and argue with your inventory later.
FAQ
What should I scan first in Subnautica 2?
Start with fragments and stations that unlock tools, base systems, vehicle routes, and route-extending upgrades.
What does the Bioscanner do?
Current reporting says the Bioscanner upgrade lets you scan marine life to unlock additional Biomods. PC Gamer also warns that old lifeform scans do not retroactively count.
Where should I look for the Bioscanner?
PC Gamer places it in Cicada wreckage roughly 500m southeast of the Alien Ruins Research Outpost, around bearing 130.
Do I need more oxygen for scan routes?
Usually, yes. Scanning asks you to stay still, so Air Bladders, air pockets, and tank upgrades make the route much safer.