Last updated: 13 July 2026

Subnautica 2 DNA Modification Guide — Biomods, Bioscanner & Best Picks

Subnautica 2 is not the original Subnautica. The alien ocean you have landed in has its own biology, and the game expects you to adapt to it — literally. The Biomod system is the mechanic that sets Subnautica 2 apart from its predecessors: by scanning the planet's creatures with the Bioscanner, you unlock biological modifications that alter your own capabilities. Better oxygen management. Faster movement near surfaces. Bioluminescence in total darkness. Creature-deterring electric shocks. This guide covers every step — finding and crafting the Bioscanner, building the Biolab, choosing the modifications that matter most, and using the system effectively in both solo and co-op.

01What the Biomod System Is — and Why It Matters

Biomods are biological upgrades that modify your capabilities as a player. Where the original Subnautica progressed your abilities almost entirely through equipment — better tanks, better suits, better vehicles — Subnautica 2 adds a parallel track: you adapt your own biology to the alien ocean. Biomods are divided into two types:

• Active biomods are manually triggered abilities — a burst dash to dodge predators, a bait cloud to distract them, a sonar pulse to find resources. You activate them on demand.
• Passive biomods are always-on effects when equipped — faster swimming near surfaces, reduced oxygen consumption when stationary, self-illumination in darkness, invisibility while motionless.

You start with one active biomod and one passive biomod slot. From update 1.1 'Adaptive Measures' onward, additional passive Biolab slots can be unlocked by scanning specific creatures with the Bioscanner — the Biolab displays your scan progress toward each slot expansion. You can swap your equipped choices freely at any Biolab at no cost.

There are 15 biomods in the current build: 5 active and 10 passive. Four unlock automatically the first time you access a Biolab. The remaining 11 each require scanning a specific creature with the Bioscanner tool.

02Getting the Bioscanner

The Bioscanner is the tool used to scan alien creatures and unlock their corresponding biomods. It is not available from the start — you need to find its blueprint fragments before you can craft it. The blueprint requires scanning two fragments, both located near a wreck in the Alien Ruins area (the Cicada Wreck). You will need the Repair Tool to access the wreck entrance.

Once you have the blueprint, craft the Bioscanner at your Modification Station (not the escape pod Fabricator) using: 1× Scanner, 2× Enameled Glass, and 3× Conduit Crystals. The Modification Station itself must be built first — its blueprint is also found in the Alien Ruins area, and it is assembled via the Habitat Builder using 2× Titanium, 2× Celestine, and 2× Copper.

With the Bioscanner equipped, point it at a living creature and hold the scan button for the scan to complete. Each successful scan immediately unlocks that creature's corresponding biomod in the Biolab — there are no vials, no trips back to base required for processing. The biomod is available to equip the moment the scan finishes.

• Scans are not retroactive. If you previously scanned a creature with the standard Scanner, that data does not count — you must scan it again with the Bioscanner to unlock its biomod.
• Scanning does not harm or kill the creature. For hostile creatures you will need to manage the threat while completing the scan.
• Each creature type only needs to be scanned once. You do not need multiple scans of the same species.

03Building and Using the Biolab

The Biolab is the base module where you equip and swap your active biomods. Its blueprint is unlocked by scanning the powered Biolab inside the Welcome Center — the alien structure located southeast of your Lifepod. One scan unlocks the blueprint immediately. Power the Welcome Center Biolab by inserting a Basic Battery into the wall socket to make it interactive before scanning. As of update 1.1, two additional Biolabs exist in the world at Coral Gardens and Axum Ruins; interacting with each one unlocks an additional default biomod.

Build your own Biolab using the Habitat Builder in the Interior Facilities section. Recipe: 3× Titanium, 1× Copper Wire, 1× Mild Acid. It requires no external power connection once placed — it works as soon as it is built.

Interacting with the Biolab opens a slot panel: one active slot and one passive slot are available. Drag any unlocked biomod into a slot to equip it. Drag a different biomod into an occupied slot to replace it immediately — the previous biomod is deactivated but remains unlocked and can be re-equipped at any time.

• You can build multiple Biolabs in a base. In co-op this lets multiple players swap biomods simultaneously without waiting.
• All Biolabs in a shared base share the same pool of unlocked biomods. Any player can equip any biomod the group has collectively unlocked.
• Swapping biomods is free and instant. Experiment freely — there is no penalty for changing your equipped pair.

04Default Biomods — Your Starting Four

Four biomods unlock automatically when you first access the Welcome Center Biolab. Two more default biomods unlock at the Biolabs in Coral Gardens and Axum Ruins respectively — explore those areas to collect them. The four Welcome Center defaults are strong enough that you will likely keep some equipped long into the game:

Dash (active): A directional burst that propels you away from a threat or hazard. The core panic button for close encounters — works in any direction including upward. Has a roughly five-second cooldown.

Pathfinder (active): Releases a trail of pheromone particles that lingers for four to five minutes and is visible on your HUD. Invaluable in cave systems where it is easy to become disoriented — drop a trail on the way in and follow it back out.

Sea Skimmer (passive): Increases swim speed when you are close to underwater surfaces or the seafloor. Effective for resource gathering runs along the seabed and for moving through cave corridors quickly.

Oxygen Control (passive): Reduces your oxygen consumption by 75 percent when you are not moving. Combine with Dash to reach a safe spot, hold still, and stretch your remaining air significantly. Extremely useful for hiding from predators — stationary behind cover, you barely consume oxygen.

• For your first hours: Oxygen Control (passive) and Dash (active) is the most defensive default pair — it gives you a movement burst and stretches air when hiding.
• Once you start cave exploration, swap active to Pathfinder. The trail prevents the most common cause of early death: running out of oxygen while lost in tunnels.
• Sea Skimmer is more efficient than Oxygen Control during active resource runs on the seafloor. Swap based on what you are doing.

05Bioscanner Biomods — Passive Unlocks

Ten passive biomods require Bioscanner scanning of specific creatures. Below are the most impactful ones and where to find their source creatures. EA build note: creature depths and exact locations are subject to change in patches.

Bioluminescence — source: Sandspear (hostile crustacean found buried in sand in caves near the Lifepod) or Electric Geordie. Generates a soft persistent glow from your body in darkness. Frees your held tool slot from needing a flashlight during cave dives. The Sandspear is hostile and will lunge if disturbed — approach from above rather than directly.

Water Secretion — source: Water Slug (passive mollusc found in plant cover near the Lifepod, early biome). Slowly generates water packets passively. Reduces the urgency of fresh water collection in the early game.

Slow Metabolism — source: Nibbler Mango (hostile fish). Reduces food consumption speed by approximately 42 percent. Pairs well with Dermal Garden if you swap between the two.

Dermal Garden — source: Needler Mango (hostile fish found at roughly 190 metres near the Alien Ruins). Slowly grows nutritious algae on your skin that generates food passively. Useful in deep-dive scenarios where returning to surface for food is inconvenient.

Threat Sense — source: Hoverthorn (edible fish near the Observatory tower in the Alien Ruins). Detects hostile creatures within a 50-metre radius and marks them on the HUD. Dramatically changes how safely you can navigate biomes with Apex predators — you see the threat before it sees you.

Camouflage — source: Bullethead (hostile fish attached to high cliff walls in the Alien Ruins). Makes you invisible to predators while you are completely motionless. Combined with Oxygen Control (which stretches air while still), you can hide indefinitely from passing Leviathan-class threats.

Water Retention — source: Coral Crab. Doubles the amount of fresh water you gain from all sources.

Homing Sense — source: Surge Jelly or Hammerhead. Detects powered bases within range and displays a HUD direction indicator. Useful in complex biomes or when returning from a long dive without landmarks.

• For early exploration: Water Secretion (Water Slug, near start) is the easiest unlock — the Water Slug is passive and close to your Lifepod.
• For cave diving: Bioluminescence (Sandspear) is the highest-impact early unlock once you leave the starting area.
• For threat management: Threat Sense (Hoverthorn, Alien Ruins) transforms navigation in predator-heavy biomes.
• For deep-area evasion: Camouflage (Bullethead, Alien Ruins) is the single most powerful defensive passive in the current build.

06Bioscanner Biomods — Active Unlocks

Three additional active biomods require Bioscanner scanning. These expand your active toolkit beyond the default Dash and Pathfinder:

Chum Cloud — source: Toxic Sponge or Houndgar. Deploys a cloud of bait material approximately 10 metres forward that draws creature attention for a sustained duration. The practical function is predator distraction: throw a Chum Cloud in a direction away from your path, wait for the predator to orient toward it, then pass safely. Also useful as a distraction while scanning a hostile creature — deploy the cloud, let the target investigate it, scan from behind.

Electric Discharge — source: Electric Geordie. Emits a high-voltage shock that deters medium and large predators in your immediate vicinity. Does not work against apex predators or Leviathan-class threats, but effectively repels the mid-tier territorial creatures in deeper biomes. Note: cannot be used while inside the Tadpole submersible.

Sonic Echo — source: Collector Leviathan (Apex threat). Emits a sonar pulse that highlights nearby resources through terrain and water. The most powerful resource-finding tool in the game, but requires scanning an Apex predator to unlock — this is a late-game unlock for most players.

• Chum Cloud is the most universally useful active unlock. Replace Dash with it once you have it — the predator distraction it provides is more broadly applicable than the burst movement.
• Electric Discharge fills a defensive role in mid-depth biomes where Dash may not carry you far enough to escape a territorial predator.
• Scanning the Collector Leviathan for Sonic Echo is a high-risk, high-reward operation. Approach only with the Tadpole ready for emergency escape.

07Scanning Strategies — How to Collect Biomods Safely

The scanning mechanic is simpler than it might appear: point the Bioscanner at a living creature and hold the scan button. A single scan of each species is all you need. The biomod unlocks instantly — no vials, no return to base required. The main challenge is getting close enough to hostile creatures to complete the scan without taking damage.

For passive creatures (Water Slug, Hoverthorn): Approach slowly from below or behind. Most small creatures scatter if you swim directly toward them at speed. Slow, angled approaches work far better. If the creature flees, follow at a walk — chasing at full speed will scatter them further.

For hostile shallow-area creatures (Sandspear): The Sandspear burrows and lunges upward. Approach from directly above — its lunge animation is primarily lateral. Scan quickly and back off. Once you unlock Chum Cloud, you can distract it first.

For hostile mid-depth creatures (Needler Mango, Bullethead): Use the Chum Cloud biomod once you have it. Deploy a cloud away from your scanning position, approach from behind while the creature investigates it, and complete the scan during that window. Return to the Tadpole after each attempt if the creature resets.

For Apex targets (Collector Leviathan): Approach in the Tadpole, not on foot. Get within scan range, complete the scan, and put immediate distance between you and the Leviathan. Leviathan-class creatures are not deterred by any biomod in the current EA build.

• You only need to scan each species once — one Sandspear in one dive unlocks Bioluminescence permanently.
• Electric Discharge cannot be used as a self-defense tool while scanning (it knocks you back and resets your approach). Use Chum Cloud or Dash for escape instead.
• If a creature flees your scan attempt, note the location and return later with Chum Cloud equipped — the distraction window makes most hostile scans significantly easier.

08Co-op Specialisation — Splitting Biomod Roles

In co-op sessions, the Biomod system creates natural role specialisation. Each player has their own pair of biomod slots and unlocks biomods independently — scanning by one player does not unlock a biomod for another. However, all players can equip any biomod they have personally unlocked, and all Biolabs in a shared base are accessible to all players.

A common two-player specialisation: one player runs Chum Cloud (active) + Threat Sense (passive) as the threat-manager — they distract predators during sampling and call out approaching threats. The other runs Pathfinder (active) + Bioluminescence (passive) as the explorer — they mark routes in caves and provide ambient lighting during joint dives.

For four-player sessions: an explorer pair (Bioluminescence + Sonic Echo for resource finding), a defensive pair (Camouflage + Electric Discharge for holding position near predator zones), and flexible swap across both Biolabs as the dive changes context.

• Both players in a pair need to independently scan the Collector Leviathan to both have Sonic Echo available. Co-ordinate the scan — one player distracts while the other completes it, then switch.
• All Biolabs in a shared base are accessible to all players. Build at least two Biolabs so players can swap simultaneously without blocking each other.
• Active biomod cooldowns are per-player. Both players having Chum Cloud means double the distraction rate during aggressive-creature dives.