The foundation of any Subnautica 2 survival run is a working knowledge of passive and edible fauna. These creatures pose no threat and form the backbone of your Food and Water supply. The Peeper returns as the most reliable food source, yielding 18 food and 5 water when cooked, and it can be found in nearly every shallow biome. Boomerangs and Garryfish are equally common and offer slightly lower nutrition but are easier to catch in groups. Cooked fish always provide more food value than raw, so prioritize building a Fabricator or using a cooked-fish storage system early.
For water, the Bladderfish remains essential because it can be processed into filtered water at the Fabricator, yielding 20 water per fish. The Reginald is a standout for long expeditions, offering 25 food when cooked, the highest single-fish value among common species. Beyond nutrition, several passive creatures serve crafting purposes. The Stalker drops teeth used in advanced tool recipes, while Jellyrays and Rabbit Rays drop enzymatic materials used in biomod research. Understanding which passive creatures double as resource nodes saves inventory space and farming effort.
Aquariums and alien containment let you breed passive fauna sustainably. Placing two of the same species in a containment unit with appropriate flora will, over time, produce a self-renewing food supply. This is the single best long-term solution to hunger and thirst, and it frees you from constant hunting. Stock your containment with Peepers, Reginalds, and Bladderfish for a balanced yield of food and water.
Passive and Edible Fauna
The foundation of any Subnautica 2 survival run is a working knowledge of passive and edible fauna. These creatures pose no threat and form the backbone of your food and water supply. The Peeper returns as the most reliable food source, yielding 18 food and 5 water when cooked, and it can be found in nearly every shallow biome. Boomerangs and Garryfish are equally common and offer slightly lower nutrition but are easier to catch in groups. Cooked fish always provide more food value than raw, so prioritize building a Fabricator or using a cooked-fish storage system early.
For water, the Bladderfish remains essential because it can be processed into filtered water at the Fabricator, yielding 20 water per fish. The Reginald is a standout for long expeditions, offering 25 food when cooked, the highest single-fish value among common species. Beyond nutrition, several passive creatures serve crafting purposes. The Stalker drops teeth used in advanced tool recipes, while Jellyrays and Rabbit Rays drop enzymatic materials used in biomod research. Understanding which passive creatures double as resource nodes saves inventory space and farming effort.
Aquariums and alien containment let you breed passive fauna sustainably. Placing two of the same species in a containment unit with appropriate flora will, over time, produce a self-renewing food supply. This is the single best long-term solution to hunger and thirst, and it frees you from constant hunting. Stock your containment with Peepers, Reginalds, and Bladderfish for a balanced yield of food and water.
Hostile Predators and Mid-Tier Threats
Hostile predators in Subnautica 2 are categorized by aggression, territory size, and damage output. The most common early-game threat is the Cave Crawler, a land-and-water hybrid that swarms in packs near wrecks and island shelves. They deal light damage but can overwhelm an unprepared player. The Biter and its larger cousin the Blighter patrol shallow caves in schools and will shred your health bar in seconds if surrounded. The counter to both is vertical movement and the Seaglide.
In the mid-depth range, the Sand Shark burrows beneath the seafloor and ambushes anything that passes overhead. Its tell is a subtle disturbance in the sand before it erupts. The Boneshark patrols the Underwater Islands and Bulb Zone aggressively, and unlike the Sand Shark it will pursue for considerable distances. The Cryptosuchus is a territorial crocodilian predator found in the Thermal Spires that charges in straight lines, making it predictable but dangerous in confined lava channels. Each of these mid-tier predators deals 30 to 50 damage per hit and can destroy an unarmored Seaglide or Tadpole in two to three strikes.
The key to surviving mid-tier predators is pattern recognition. Every species patrols a fixed territory and telegraphs its attacks. Bonesharks circle before charging; Cryptosuchus lowers its head before a lunge. Learn these tells, keep your vehicle hull repaired, and always carry a Sonic Resonator or Decoy as insurance. Mid-tier predators are the leading cause of death for players transitioning from shallow to deep biomes, so treat any new species as potentially lethal until proven otherwise.
| Creature | Biome | Damage | Behavior |
|---|---|---|---|
| Cave Crawler | Islands, wrecks | Low | Swarm |
| Boneshark | Underwater Islands | 40-50 | Pursuit |
| Sand Shark | Grassy Plateaus | 35-45 | Ambush |
| Cryptosuchus | Thermal Spires | 45-55 | Charge |
Leviathan-Class and Apex Predators
Leviathans are the apex predators of Subnautica 2 and represent the ultimate environmental hazard. These creatures cannot be killed or meaningfully damaged by player tools, and an encounter with one is a test of evasion, not combat. The Chelicerate is the most frequently encountered leviathan, patrolling the Deep Purple Vents and Deep Lilypad Caves. It deals massive damage, capable of destroying a Tadpole in a single grab and killing an unarmored player instantly. Its patrol route is wide but predictable, and it telegraphs attacks with a distinctive roar and body turn.
The Shadow Leviathan is the deep-biome apex threat, found in the Crystal Caves and the deepest fabricator zones. It is faster and more aggressive than the Chelicerate, with a longer aggro range and a grab attack that can swallow a player whole. Encounters with the Shadow Leviathan require a fully upgraded vehicle and a pre-planned escape route. The Void Chelicerate patrols the map edge, the so-called dead zone, and serves as a hard boundary preventing players from swimming into the void. If you see one, you have gone too far; turn back immediately.
A new addition in Subnautica 2 is the Titan Holefish predator dynamic, where certain large creatures hunt cooperatively, a behavior not seen in the first game. This means a single leviathan encounter can attract secondary predators drawn by the commotion. When fleeing a leviathan, be aware of your surroundings and do not flee directly into the territory of another predator. The deep biomes are layered with overlapping threat zones, and the safest path is rarely a straight line.
- Chelicerate: Deep Purple Vents, Lilypad Caves
- Shadow Leviathan: Crystal Caves, deep zones
- Void Chelicerate: Map edge / dead zone
- Glow Whale: Passive leviathan, Lilypad Islands (non-hostile)
Scanning, Research, and Bestiary Completion
Completing the bestiary requires scanning every creature in the game, which unlocks PDA entries and research bonuses. Use the Scanner on both live and deceased specimens. Live scans are safer but require patience and positioning, while deceased specimens, found naturally or left after predator kills, can be scanned at leisure. Each completed entry contributes to your fauna research percentage, which unlocks cosmetic and functional rewards at milestones of 50, 75, and 100 percent.
For dangerous species, the safest scanning method is to approach from above or behind during the creature's patrol far-point, when it is moving away from you. Using a Stasis Rifle to freeze a predator briefly allows a clean scan, though this consumes battery and risks aggro if the freeze wears off too early. Scanning leviathans is the most dangerous bestiary task and should only be attempted with a fast vehicle and a clear escape vector. Many players postpone leviathan scans until they have the Jet Speeder, whose speed makes evasion reliable.
Maintain a checklist as you explore. The PDA organizes fauna by biome, so visiting each biome systematically ensures you do not miss species. Some creatures only appear at night or during specific weather events, adding a temporal dimension to completion. The bestiary is one of the most rewarding long-term goals in Subnautica 2, and a 100-percent completion run will take you to every corner of the map and deepen your understanding of the ecosystem immeasurably.