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Subnautica Fragment Locations — Scan Checklist

Every key blueprint, where its fragments hide, and how many scans you need — as a tick-off checklist: check one off when you've unlocked it and it drops to the bottom, saved on your device. Ordered roughly early-game to deep, so you can work straight down the list.

Scan counts & biomes verified vs. the Subnautica wiki · original Subnautica (1.0) · June 2026
Start here
Grab the Seaglide (Safe Shallows / Kelp Forest) and Seamoth (Grassy Plateaus wrecks) first — they open up everything else.
Two traps to know: the Cyclops is 9 scans (three separate blueprints), and the small Prawn Suit arm fragments don't unlock the suit — only the proper Prawn fragments do. Tick each blueprint off as you scan it. Full checklist ↓
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Fragment Checklist

Tap a row to check a blueprint off once you've fully scanned it. "Wrecks" means the fragments spawn inside wreck structures within that biome.

BlueprintScansWhere the fragments are
Seaglide2Safe Shallows & Kelp Forest — in boxes and small wrecks (earliest)
Mobile Vehicle Bay3Kelp Forest crates; wrecks in Safe Shallows, Grassy Plateaus & Kelp Forest
Seamoth3Grassy Plateaus wrecks around Lifepod 5; 2 in the Aurora's Seamoth Bay
Laser Cutter3Grassy Plateaus and its wrecks (the main source)
Scanner Room3Crag Field, Grassy Plateaus, Sea Treader's Path; wrecks in Bulb Zone, Grand Reef, Blood Kelp Trench
Modification Station3Crag Field, Mushroom Forest, Sparse Reef; assorted wrecks
Propulsion Cannon2Aurora, Crash Zone, Underwater Islands (and Grassy Plateaus wrecks)
Stasis Rifle2Underwater Islands; wrecks in Safe Shallows, Kelp Forest & Bulb Zone
Moonpool2Grand Reef & Mushroom Forest; wrecks in Dunes, Mountains, Sparse Reef, Blood Kelp Trench
Prawn Suit4The Aurora's Prawn bay (most reliable); wrecks in Mountains, Sea Treader's Path, Underwater Islands
Cyclops9 (3+3+3)Hull, Engine & Bridge — Mushroom Forest, Crash Zone, Sea Treader's Path, Crag Field, Underwater Islands, Mountain Island
The Cyclops is three blueprints. Hull, Engine and Bridge each need 3 scans (9 total). Mountain Island has all of them but a Reaper patrols it — the Mushroom Forest (hull + bridge) and Crag Field / Underwater Islands wrecks (engine) are the safer route.
Prawn Suit fragment trap: the little Prawn Suit arm fragments scattered in wrecks take 20 scans and don't unlock the suit — only the four proper Prawn Suit fragments do. The Aurora's Prawn bay is effectively the place to get them.
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Data-Box Blueprints (Not Fragments)

A couple of blueprints people hunt for aren't fragment-based at all — you grab them from a data box in a wreck, not by scanning:

BlueprintWhere the data box is
Repulsion CannonAurora, Lifepod 12, and wrecks in Grand Reef & Underwater Islands (craft at a Modification Station)
Vehicle Upgrade ConsoleWrecks in the Dunes, Grassy Plateaus, NW Mushroom Forest & Sparse Reef (built in a Moonpool)

Subnautica Fragments FAQ

Where are the Seamoth fragments?
Scan 3: the Grassy Plateaus wrecks/debris around Lifepod 5 are easiest, plus 2 inside the Aurora's Seamoth Bay.
How many fragments for the Cyclops?
9 scans — it's three blueprints (Hull, Engine, Bridge), each needing 3. Spread across Mushroom Forest, Crash Zone, Sea Treader's Path, Crag Field, Underwater Islands and Mountain Island.
Why won't my Prawn Suit unlock?
You're probably scanning the arm fragments (20 scans, don't unlock it). Scan the four proper Prawn Suit fragments — the Aurora's Prawn bay is the reliable source.
Does the checklist save my progress?
Yes — checked blueprints are saved in your browser on this device, no account needed. Use a list's Reset button to clear it.

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