Subnautica 2 Complete Creature Guide: All Biomes, Fauna & Leviathan Encounters

Creature Guide Overview

Planet 4546B's oceans teem with life spanning eight major biomes, each hosting a unique ecological web of herbivores, scavengers, predators, and Leviathan-class apex predators. Understanding where creatures live, how they behave, and what triggers their aggression is essential for every phase of your playthrough -- from your first cautious swim through the Safe Shallows to your final descent into the Inactive Lava Zone.

Subnautica 2 expands the creature roster significantly compared to the original game. New species include the Phantom Ray (a translucent deep-sea predator), the Razorjaw (a pack hunter found in the Blood Kelp Zone), and the Abyssal Sentinel (a stationary creature that guards key story locations in the Lost River). All creatures follow predictable behavioral patterns once you learn to read them.

This guide catalogs every creature by biome, provides detailed behavioral profiles, and offers concrete survival strategies for each encounter type. Creature behavior is divided into four categories: Passive (ignores you), Skittish (flees on approach), Defensive (attacks only when provoked), and Aggressive (attacks on sight or within a proximity trigger).

Safe Shallows: Harmless Fauna

The Safe Shallows is the starter biome surrounding your lifepad. Its waters are warm, shallow (5-30 meters), and populated entirely by passive creatures that pose zero threat. This biome is your primary food source during the early game.

The peeper is the most abundant species and provides the Sonar Pulse bio-mod after 3 scans, which highlights nearby resources within a 50-meter radius. Prioritize scanning peepers early -- the Sonar Pulse saves significant exploration time throughout the entire game.

Kelp Forest Biome Creatures

The Kelp Forest borders the Safe Shallows and descends from 30 to 80 meters. Tall creepvine stalks provide cover for both prey and predators. This is the first biome where you encounter defensive creatures that can deal damage if provoked.

The primary threat here is the Stalker, a medium-sized predator that patrols the forest floor. Stalkers are attracted to shiny objects -- particularly scrap metal and titanium you carry in your inventory. They will swim toward you, investigate, and snap at you if you get within 3 meters. Their bite deals 15 damage per hit and can destroy scanner fragments if left uncollected.

The Hoverfish remains present here and is significantly more common than in the Safe Shallows. The Rocket Fish makes its first appearance -- a defensive species that propels itself at high speed when threatened, dealing 5 damage on contact but quickly swimming away afterward.

Grassy Plateaus: Medium Threats

The Grassy Plateaus biome sits between 80 and 150 meters deep and is characterized by flat, sandy terrain covered in sea grass. This biome is resource-rich but introduces two aggressive species that will actively chase you.

Sandsharks burrow in the sandy floor and ambush swimmers who pass directly overhead. Their detection range is approximately 8 meters, and they deal 20 damage per bite. Sandsharks are slow swimmers and give up pursuit after 10 seconds -- if you can reach a vertical surface or your vehicle, you are safe.

Warper (new in Subnautica 2) is a bio-electric predator that generates a short-range teleportation field. If you enter its field, it teleports you 10-15 meters in a random direction while disorienting your controls for 2 seconds. Warpers deal only 10 damage but are dangerous because they separate you from your vehicle or escape route.

Sparse Reef & Caves

The Sparse Reef is a transitional biome between the Plateaus and the deeper zones, ranging from 150 to 250 meters. Its open water and scattered rock formations provide minimal cover. Creature density is low, but the species present are more dangerous than anything in the biomes above.

Bonesharks patrol the Sparse Reef in pairs. They are aggressive on sight within a 15-meter range, deal 25 damage per bite, and can bite twice in rapid succession. Their only weakness is poor turning ability -- sharp direction changes cause them to overshoot and lose tracking for 2-3 seconds, giving you a window to escape.

Cave systems within the Sparse Reef contain Crabsnakes, large serpentine creatures that inhabit hollow rock formations. They are territorial but non-pursuing -- if you swim past their nest quickly, they will not chase you. However, entering a cave with a Crabsnake without a vehicle is extremely risky.

Blood Kelp Zone: Aggressive Predators

The Blood Kelp Zone is one of the most hostile biomes in the mid-game. Red-tinged kelp reduces visibility to under 10 meters, and the zone is populated by the Razorjaw, a new pack-hunting predator introduced in Subnautica 2.

Razorjaws hunt in groups of 3-5. They communicate through bioluminescent flashes, coordinating attacks from multiple angles. A single Razorjaw deals 18 damage, but a coordinated pack strike can deal 50-70 damage in under 2 seconds. Their aggro range is 12 meters, and they will pursue for up to 20 seconds.

The only reliable counter to Razorjaw packs is your vehicle. A Tadpole with a Perimeter Defense Module emits an electric pulse that stuns all creatures within 15 meters for 5 seconds. This gives you enough time to escape the pack and relocate.

Deep Grand Reef

The Deep Grand Reef (250-450 meters) is a transitional zone between mid-game and late-game biomes. Visibility is extremely low, and the ambient audio is dominated by deep rumbling sounds from distant Leviathan activity. The primary creatures here are Ghost Leviathans (juvenile), which patrol the reef boundaries.

Juvenile Ghost Leviathans deal 30% less damage than adults but are still lethal if you are swimming outside a vehicle. Their body-contact attack deals 40 damage, and they can grab your Tadpole submersible for sustained crush damage if you are not equipped with a hull reinforcement module.

The reef floor is also home to Ampeels, electrified eels that discharge 15-damage shock pulses when approached within 5 meters. They are stationary and non-pursuing but cluster around valuable resources, making harvesting dangerous without insulated equipment.

Lost River Biome

The Lost River (450-700 meters) is the gateway to the late game. This biome features massive cave systems, alien architecture, and the highest non-Leviathan creature density in the game. The green brine rivers that flow through the cave system deal 1 damage per second to any creature or player that touches them.

Sea Dragon Leviathans patrol the deeper sections of the Lost River. While their territory overlaps with the Lost River, they are most commonly found near the transition to the Inactive Lava Zone. Sea Dragons are the most aggressive Leviathan species and will attack both players and vehicles on sight within a 50-meter detection range.

The Abyssal Sentinel is a new Subnautica 2 creature found exclusively in the Lost River near key story locations. It is a stationary, turret-like organism that fires bio-electric projectiles at targets within 30 meters. Each projectile deals 20 damage and applies a 3-second movement slowdown. Sentinels cannot be killed with conventional weapons -- you must navigate around their range or use the shield bio-mod to absorb their projectiles.

Leviathan Guide: Known Species

Leviathan-class creatures are the apex predators of Planet 4546B. They are large enough to destroy vehicles, aggressive enough to kill in seconds, and numerous enough that you will encounter them regularly once you leave the shallow biomes. This section covers every confirmed Leviathan species in Subnautica 2.

Bio-Mod System: Creature Abilities

Every creature in Subnautica 2 can be scanned multiple times to unlock a bio-mod gene -- a passive ability you can equip at a Bio-Mod Station. The quality of the bio-mod is determined by the creature's danger level: scanning a Leviathan yields a significantly more powerful mod than scanning a peeper.

The most valuable bio-mods for creature encounters are:

• Thermal Resistance (from Ampeels, 5 scans) -- reduces damage from electric attacks by 40%. Essential for the Deep Grand Reef.
• Predator Cloak (from Phantom Leviathan, 8 scans) -- reduces your detection range by aggressive creatures by 50% for 30 seconds on activation. A game-changer for late-game exploration.
• Leviathan Repellent (from Reaper Leviathan, 10 scans) -- creates a 40-meter aura that discourages Leviathan attacks for 60 seconds. Single-use per trip, but invaluable for crossing Leviathan patrol routes.
• Pressure Adaptation (from Abyssal Sentinel, 7 scans) -- reduces depth crush damage to vehicles by 25%. Passive, always active.

Creature Mitigation Tips

Surviving Subnautica 2's creatures is about preparation and pattern recognition, not combat. The game's creatures are designed to punish aggression and reward avoidance. These universal tips apply to every biome and encounter type:

1. Always move laterally around predators. Most creatures track forward momentum. A lateral strafe breaks their lock faster than forward swimming.
2. Use sonar before visual contact. The scanner room and Sonar Pulse bio-mod reveal creatures before you can see them. Information is survival.
3. Never swim in a straight line in hostile biomes. Predictable movement patterns make you an easy target for ambush predators like sandsharks and Phantom Leviathans.
4. Keep your vehicle between you and the threat. A vehicle's collision box blocks creature pathing. Use your Tadpole as a mobile shield when retreating on foot.
5. Carry decoys everywhere below 200 meters. A 2-titanium, 1-copper investment can save a 30-minute corpse run.
6. Learn creature audio cues. Every Leviathan has a distinct roar and proximity sound. Recognizing these sounds lets you change course before visual contact.