I still remember the first time I dipped below the ice sheet in Subnautica 2, only to come face to face with a bioluminescent leviathan I’d never seen before. I panicked, fumbled for my seaglide, and barely made it back to my drop pod before it could take a chunk out of my hull. That encounter taught me fast that knowing what Subnautica 2 creatures live in each biome isn’t just a fun fact—it’s a survival necessity. Whether you’re a veteran of the first Subnautica game or brand new to the 4546B universe, this guide breaks down everything you need to know to identify, avoid, or interact with every life form you’ll find under the ice.
Key Subnautica 2 Creatures You’ll Encounter in Shallow Biomes
Most Subnautica 2 creatures in the shallow 0-50m biomes are non-aggressive, so you can explore these areas freely when you first start the game. The ice shelf edge and glacial pool zones are full of small, harmless life that you can use to stock up on early resources. Glow Shrimp are your most reliable early-game food source, they’re slow, non-aggressive, and you can catch them with a basic survival net. They also respawn every 10 in-game minutes, so you can set up a small farm near your base if you don’t want to hunt for food every day.
There are a few small threats to watch for even in these safe zones, though. Ice Nibblers are tiny, silver fish that nest in groups under floating ice chunks. They don’t do a lot of damage on their own, but they’ll swarm you if you get too close to their nests, and they can drain your oxygen 20% faster than normal if you’re surrounded. Frost Eels only attack if you get within 3 meters of their hiding spots in rock crevices, so if you stick to open shallow water, you won’t have to worry about them. I once spent 10 minutes chasing a rare golden glow shrimp, only to back right into a Frost Eel nest and lose half my health before I could swim away. Don’t make that mistake.
Aggressive Mid-Depth Creatures and How to Escape Them
Once you move past the 50m mark into the glacial trench biomes, the creatures get a lot bigger and a lot more territorial. Most Subnautica 2 creatures in this zone won’t hunt you across the map, but they will attack if you wander into their territory uninvited. The most common threat here is the Shadow Maw, a 15-meter long shark-like creature with bioluminescent blue stripes that hunts alone. It can swim faster than your basic seaglide, so you won’t be able to outrun it without upgrades. Shadow Maws are fast, but they’re sensitive to bright light—if you shine your upgraded flashlight directly at their face, they’ll recoil for 3-5 seconds, giving you enough time to swim away or pull out a stun rifle.
You’ll also find Swarm Tentacles in this zone, colonial organisms that look like floating green seaweed until you get within 10 meters of them. When triggered, they’ll stretch out thin tendrils to wrap around you and drag you deeper into the trench, where the pressure will start to damage your suit if you don’t have a mid-depth upgrade. You can cut through Swarm Tentacle tendrils with a standard survival knife in less than 10 seconds, so always keep your knife handy when exploring mid-depth trenches. If you’re exploring this zone for the first time, follow these quick rules to stay safe:
- Always keep at least one spare oxygen tank on you if you’re exploring below 50m, even if you think you’ll only be gone for a few minutes
- Upgrade your seaglide to the thermal model before heading into mid-depth biomes, as the extra speed will get you out of danger 30% faster
- If you hear a low, rumbling hum while swimming, stop immediately and scan the area around you—this is the warning call of a nearby Shadow Maw
Passive Deep Biome Creatures That Provide Rare Resources
Once you hit 200m and below, you’ll enter the thermal vent biomes, where the water warms up from geothermal activity and the life forms get far more unique. Unlike shallower areas, Subnautica 2 creatures in the deep thermal biomes have evolved to survive extreme pressure and cold, so they have unique adaptations you won’t see anywhere else. Most of them are non-aggressive, and many drop rare resources you can’t find anywhere else on the map. Thermal Limpets drop high-temperature resistant gel that you need to build the deep dive suit, so collect as many as you can when you first find them. They stick to the sides of thermal vents, and you can pick them up with your bare hands without any risk of attack.
You’ll also spot Giant Jellyrays floating through this zone, 20-meter wide passive creatures that leave trails of bioluminescent slime behind them as they move. That slime is a great source of energy for your base, and you can collect it without disturbing the Jellyray at all. I once followed a Giant Jellyray for 20 minutes just collecting its slime, and I ended up with enough energy to power my base for three in-game days. Just don’t get too close to its underside, as it has small stinging cells that will give you minor poison damage if you touch them. Crystal Crabs are another useful deep biome creature, small skittish crabs with shells made of rare quantum crystal you need for late-game upgrades like the warp gate. You can sneak up on them with a stealth suit to collect their shed shells, or leave small bits of glow shrimp out as bait to lure them closer.
How to Scan and Document Creatures for Full Game Completion
If you’re the type of player who wants to fill out every entry in your alien biology database, you’ll need to scan every creature you encounter, and that takes a little bit of planning. First, make sure you upgrade your scanner to the long-range model early on, as it lets you scan creatures from 10 meters away instead of 2, which is a game-changer for aggressive life forms. There are 32 total Subnautica 2 creatures to scan for full completion, so you’ll have plenty of reasons to explore every corner of the map. You only need to scan one individual of each species to unlock the full entry, so you don’t have to risk getting close to multiple Shadow Maws just to fill out your log.
Some creatures only come out at specific times of day or in specific weather conditions, so if you’re missing an entry, don’t just keep searching the same area at the same time. I spent three days searching for the rare Ice Glow Moth, only to realize it only spawns between 2 and 4 in-game AM, right before the sun comes up over the ice sheet. If you’ve already found traces of a creature, like shed skin or feces, check your database for hints—most entries will tell you what time of day or what specific sub-biome it lives in once you’ve found those traces. Don’t forget to scan the tiny, easy to miss creatures too, like the micro plankton that floats in open water—those count towards your completion percentage too, and most players skip them accidentally.
At the end of the day, learning what Subnautica 2 creatures live in each biome is half the fun of exploring the frozen ocean of 4546B. Some will try to eat you, some will give you rare resources, and some are just beautiful to watch from a safe distance. Take your time, scan everything you can, and don’t be afraid to turn back if you run into a creature you’re not prepared to handle. You don’t have to explore every corner of the map on your first playthrough, and being cautious will save you a lot of lost resources and frustrating respawns. Taking the time to learn about Subnautica 2 creatures will make your playthrough far less stressful and far more rewarding. Next time you gear up for a dive, pull up this guide first to make sure you know exactly what you might run into under the ice.
