Biomods are one of the most interesting systems in Subnautica 2, giving you active abilities and passive buffs that can mean the difference between a clean escape and getting eaten by something enormous. The early access build already has a solid roster to work with, but not all of them pull equal weight. Some are genuinely strong from the moment you unlock them. Others are so situational they barely see use. This tier list breaks down every available Biomod and tells you which ones are worth your time.
How do Biomods work in Subnautica 2?
Biomods come in two varieties: Active and Passive. The key rule here is that you can only equip one Active Biomod at a time, so your choice there matters a lot. Passive Biomods have no such restriction, meaning you can stack as many as you have unlocked. For a full breakdown of how to find and unlock each one, check out the complete Biomods unlock guide.
With that in mind, the tier list below focuses on practical value during normal play, not edge-case scenarios.
Subnautica 2 Ultimate Biomods Tier List
S-tier Biomods
Dash
Dash is the standout Active Biomod and it costs nothing to start with. You can use it to dodge a predator closing in fast or just cover ground more efficiently. The cooldown is short enough that it rarely feels unavailable when you need it. For an Active slot that competes with everything else on this list, Dash holds up across every stage of the game.
Sonic Echo
Finding resources at depth is genuinely annoying without help. Sonic Echo solves that by sending out a sonar pulse that highlights nearby resources, which saves a lot of aimless swimming. The deeper you go, the more value this one provides.
Camouflage
Camouflage makes you invisible to predators as long as you stay still. If something large corners you and you have no escape route, going motionless is a real option. The one caveat from testing: you can still take damage if the predator physically collides with you, so it is not a perfect panic button. Still, it is one of the strongest defensive tools available.
Homing Sense
Getting disoriented underwater is easy, especially when exploring new biomes far from your base. Homing Sense detects nearby powered bases and points you toward them, which is a passive benefit that never stops being useful. No activation required.
Dermal Garden
Dermal Garden slowly grows algae on your skin that you can eat to manage hunger. For players who find food management tedious or who spend long sessions away from their base, this passive removes a consistent pressure point.
A-tier Biomods
Electric Discharge
Electric Discharge hits at 800 volts, which is enough to send most medium and large predators retreating. The important exception: do not try it on Leviathans. Use this as a deterrent against standard threats, not as a universal panic button.
Chum Cloud
A reliable alternative to Electric Discharge when you need to break a chase. Chum Cloud drops bait that distracts predators and buys you escape time. It works well in situations where you want to avoid combat entirely rather than fight back.
Oxygen Control
Oxygen Control reduces how quickly you burn through oxygen when you are stationary. That is a narrower benefit than it sounds, since most of your oxygen drain happens while you are actively moving. A larger oxygen tank does more work overall, but this passive still has value in specific moments.
Bioluminescence
Simple and functional. Bioluminescence lets you glow in the dark, removing the need to carry a Flashlight during night exploration. It is not transformative, but it frees up an inventory slot and keeps both hands available.
Threat Sense
Threat Sense uses specialized hair cells to alert you to nearby predators approaching from blind spots, and it also flags hazardous environmental conditions. The dual function makes it genuinely useful rather than redundant with visual awareness.
Water Retention
Your body absorbs more water from any source with Water Retention active, which means you spend less time worrying about thirst management. The passive nature of the benefit makes it easy to forget it is working, which is exactly what you want from a survival buff.
B-tier Biomods
Pathfinder
Pathfinder leaves a pheromone trail you can follow back to your starting point. Early on, before you have mapping tools, this has some value. The problem is that better navigation tools make it redundant fairly quickly, so it does not age well.
Sea Skimmer
Sea Skimmer boosts your swim speed near underwater surfaces and the seafloor. The speed increase is noticeable, but vehicles like the Tadpole and tools like the Wakemaker outpace it once unlocked. This is a decent early option that becomes a bench warmer.
Water Secretion
Passively filters fresh water from the sea and slowly fills a water packet. The effect is real, but Water Retention does the same job better by improving absorption from all sources rather than generating water slowly in the background. If you have both unlocked, Water Retention wins.
Which Active Biomod should you pick?
For most players, Dash is the correct default. It is free, the cooldown is short, and it handles both combat avoidance and general traversal. Camouflage is a strong second choice if you prefer a stealth approach and can stay disciplined about staying still under pressure. Sonic Echo is the pick if resource hunting at depth is your current priority.
For deeper dives into the game's systems, the Subnautica 2 all resources list covers everything you need to know about gathering materials, and the complete tools guide explains which equipment eventually replaces some of these B-tier Biomods. The game is still in early access, so expect the Biomod roster to grow with future updates. For everything else, the full Subnautica 2 guides collection has you covered.