Introduction to Biomes
The ocean planet you have crashed onto is a vast and diverse ecosystem, divided into distinct biomes that each offer unique resources, challenges, and visual experiences. Understanding the characteristics of each biome is essential for efficient resource gathering, safe exploration, and strategic base placement. This comprehensive guide covers every biome in Subnautica 2, providing you with the knowledge needed to navigate this alien ocean with confidence.
Biomes in Subnautica 2 are categorized by depth, with each depth zone presenting progressively greater challenges and rewards. As you descend deeper into the ocean, you will encounter increasingly rare resources but also face more dangerous creatures and harsher environmental conditions. This guide is organized by depth to help you plan your expeditions accordingly.
Each biome section includes information on the typical depth range, available resources, common creatures, danger level, and recommended equipment. Use this information to prepare appropriately before venturing into unknown waters.
Shallow Water Biomes (0-200m)
The shallow water biomes represent your starting zone and form the foundation of your survival strategy. These areas are relatively safe, with abundant basic resources and manageable creature threats. Most of your early-game progression will take place in these zones.
Safe Shallows
Depth Range: 0-50 meters
Danger Level: Very Low
Resources: Titanium, Copper, Salt, Kelp, Coral, Bulbo Tree, Sandgrass
The Safe Shallows is your home base biome, surrounding your crashed escape pod. This area features warm, sunlit waters with excellent visibility and a diverse array of flora and fauna. The seafloor is covered with sand and small rock formations, making resource gathering straightforward and safe.
Key resources in the Safe Shallows include large Titanium deposits near rock outcrops, Copper nodes scattered throughout the area, and abundant organic materials from the various plant species. The creatures here are mostly peaceful, including small fish species,peepers, and hoverfish that pose no threat to the player.
The Safe Shallows is the ideal location for your first base. The shallow depth provides easy access to the surface for oxygen replenishment, and the abundance of basic resources makes early crafting straightforward. Establish your main base here before expanding to other biomes.
Grassy Plateaus
Depth Range: 30-100 meters
Danger Level: Low
Resources: Titanium, Copper, Lead, Quartz, Marina, Creepvine Sample
The Grassy Plateaus feature vast expanses of underwater grass covering the seafloor, creating a serene and visually distinctive landscape. This biome connects to the Safe Shallows and provides access to additional resource deposits not found in your starting area.
Creepvines are the signature plant of this biome, growing tall and providing both resources and a unique visual aesthetic. These plants can be harvested for Creepvine Sample, a useful material for crafting and base decoration. The creatures here are similar to those found in the Safe Shallows, mostly peaceful species that will flee if approached.
Kelp Forest
Depth Range: 50-150 meters
Danger Level: Low to Moderate
Resources: Titanium, Copper, Urchin, Sea Treader Poop, Giant Kelp
The Kelp Forest biome is characterized by towering columns of Giant Kelp that stretch from the seafloor toward the surface. The kelp creates a maze-like environment that can be both beautiful and disorienting. Light levels decrease as you move deeper into the kelp forest, requiring careful navigation.
Sea Treaders are the signature creatures of this biome, large crustacean-like animals that walk along the seafloor and produce valuable resources in the form of Sea Treader Poop. These deposits contain various minerals and organic materials that are essential for advanced crafting.
While generally safe, the Kelp Forest can become hazardous at night due to reduced visibility. Mesmers, small bioluminescent creatures, are more aggressive in darker conditions and may approach you more frequently. Consider limiting your time in this biome to daylight hours.
Mushroom Forest
Depth Range: 100-200 meters
Danger Level: Low
Resources: Quartz, Lithium, Basket Plant, Fern Palm, Giant Cove Tree
The Mushroom Forest biome is named for the enormous fungal structures that dominate its landscape. These giant mushrooms create an otherworldly environment unlike any other biome in the game. The canopy created by the mushroom caps affects light levels and navigation, creating distinct micro-environments within the biome.
Lithium becomes more accessible in this biome, making it an important resource-gathering destination for mid-game progression. The creature life here is generally passive, though some larger species may be territorial. The visual spectacle of the Mushroom Forest makes exploration particularly rewarding.
Mid-Depth Biomes (200-500m)
As you venture beyond 200 meters, the environment becomes noticeably darker and more challenging. Mid-depth biomes introduce new resource types and more formidable creatures. Proper preparation and equipment are essential for survival in these zones.
Grand Reef
Depth Range: 200-400 meters
Danger Level: Moderate
Resources: Nickel, Cobalt, Ruby, Table Coral, Brain Coral
The Grand Reef is one of the most visually impressive biomes in Subnautica 2, featuring massive coral formations that rise hundreds of meters from the seafloor. The coral structures create a complex three-dimensional environment with many hidden areas to explore and resources to discover.
Cobalt and Nickel become primary targets in the Grand Reef, as these materials are essential for advanced equipment and base construction. The coral formations themselves can be harvested for various organic materials. Stalkers are common in this biome, and their playful nature can sometimes lead to encounters that drain your oxygen.
The Grand Reef contains several cave systems that house rare resources. These caves are often inhabited by more aggressive creatures, so approach with caution. Bring multiple oxygen tanks and consider establishing a forward base nearby for extended exploration.
Bloody Kelp Forest
Depth Range: 150-350 meters
Danger Level: Moderate to High
Resources: Titanium, Copper, Blood Kelp, Blood Root, Shale Nut
The Bloody Kelp Forest earns its name from the reddish-brown color of its vegetation, created by unique plant species adapted to lower light conditions. This biome bridges the gap between shallow and deep environments, featuring both familiar creatures and new threats.
Blood Kelp is the signature resource of this biome, a distinctive plant that grows in dense clusters throughout the area. Blood Kelp Bladders are particularly valuable, containing resources used in advanced crafting recipes. The Blood Kelp Forest also provides access to several cave systems containing mineral deposits.
Jellyshroom Caves
Depth Range: 250-400 meters
Danger Level: Moderate
Resources: Silvers, Lithium, Jelly Mushroom, Cave Tuber
The Jellyshroom Caves are an underground biome accessible through several entrances throughout the ocean floor. This cave system features unique luminescent jellyfish-like organisms attached to the cave walls, creating a spectacular light display in the darkness.
The enclosed nature of the caves provides some protection from larger predators, but new threats emerge in the form of cave-dwelling creatures. Gasopods are common here, providing valuable Gas Pod resources used in advanced crafting. The cave environment requires careful oxygen management due to longer travel times.
The Jellyshroom Caves contain multiple passages, and some lead to deeper cave systems. Attempting to explore all passages without adequate preparation can lead to becoming lost or stranded. Mark your path with beacons and always ensure you have enough oxygen for the return journey.
Sea Treader Emigration Path
Depth Range: 300-450 meters
Danger Level: Moderate
Resources: Nickel, Cobalt, Shale, Sea Treader Exosuit, Sand
This biome follows the migration path of Sea Treaders between their feeding grounds and breeding areas. The seafloor is marked with distinctive tracks created by these massive creatures, and resources accumulate in the paths they create.
Resource density is high in this biome, making it an efficient gathering location for mid-game materials. The Sea Treaders themselves can be observed but should not be approached closely, as their size makes them potentially dangerous if startled.
Deep Biomes (500-1000m)
Descending beyond 500 meters takes you into the twilight zone of the ocean, where sunlight barely penetrates and new challenges await. Deep biomes feature rare resources essential for late-game progression but also host some of the most dangerous creatures in the game.
Bone Valley
Depth Range: 500-700 meters
Danger Level: High
Resources: Titanium, Copper, Lead, Bones, Fossilized Bones
Bone Valley is a haunting biome characterized by the skeletal remains of enormous ancient creatures jutting from the seafloor. These massive bones create a maze-like environment and provide access to mineral deposits trapped within their structure.
The darkness of Bone Valley makes navigation challenging, and the bone formations can obstruct your view of approaching threats. Crabsquids are common in this biome, and their electric attacks can drain your suit power rapidly. Approach Bone Valley only with adequate equipment and preparation.
Bones in Bone Valley contain Phosphorus deposits essential for advanced battery technology. However, harvesting bones is time-consuming and makes noise that can attract predators. Harvest bones quickly and be prepared to move if large creatures approach.
Dunes
Depth Range: 400-600 meters
Danger Level: Very High
Resources: Kyanite, Titanium, Copper, Magnetite
The Dunes biome features sweeping sand formations shaped by underwater currents, creating a dynamic landscape that is constantly shifting. The open terrain provides excellent visibility but offers little protection from the aggressive creatures that patrol this area.
Ampeels are the signature predators of the Dunes, capable of delivering painful electrical shocks that stun and damage. These creatures patrol the sand in pairs and will attack if you enter their territory. The Dunes should be avoided until you have vehicles equipped with defensive systems.
Crash Zone
Depth Range: 450-550 meters
Danger Level: Very High
Resources: Various Precursor artifacts, Magnetite, Lithium
The Crash Zone surrounds a massive shipwreck from an ancient civilization, providing access to valuable technological artifacts and unique resources. The wreckage is partially buried in the seafloor and extends hundreds of meters, creating a complex environment to explore.
Precursor artifacts found in the Crash Zone are essential for story progression, but the biome is heavily patrolled by aggressive creatures attracted to the wreckage. Mesmers, Ampeels, and Crab Swarms all frequent this area, creating a constant threat environment.
Never explore the Crash Zone without a vehicle equipped with defensive systems. The creature density here is among the highest in the game, and pedestrian exploration is extremely dangerous. The Seamoth is minimally sufficient, but the Prawn Suit is recommended for serious artifact hunting.
Mountains
Depth Range: 400-800 meters
Danger Level: High
Resources: Auric, Diamond, Obsidian, Mountain Kelp
The Mountains biome features towering underwater peaks that rise from the seafloor, creating a dramatic vertical landscape. The rock faces provide access to rare mineral deposits including Diamond and Auric, materials essential for the most advanced technologies.
Caves within the mountain formations contain additional resources but also shelter potentially dangerous creatures. The open faces of the mountains provide good visibility but offer no protection from threats. Warpers are known to patrol these areas, capable of teleporting the player into dangerous situations.
The Abyss (1000m+)
The deepest regions of the ocean represent the final frontier of exploration in Subnautica 2. These lightless depths are home to the most dangerous creatures and rarest resources. Only the most prepared players should venture into these zones.
The Void
Depth Range: 1000-2500 meters
Danger Level: Extreme
Resources: None initially, later Kyanite, Magnetite
The Void represents the absolute bottom of the explorable ocean, a dark expanse where no light penetrates and life takes on bizarre forms. The emptiness of The Void is both beautiful and terrifying, with the only visible features being the occasional bioluminescent creature drifting in the darkness.
Ghost Leviathans patrol The Void, enormous creatures that can kill even heavily armored players with a single attack. Their calls echo through the darkness, creating an atmosphere of constant tension. Most resources in The Void are found in underground caves and lava zones rather than the open water.
Never enter The Void without a Cyclops submarine equipped with maximum shields and a full complement of emergency supplies. Even with the best equipment, encounters with Ghost Leviathans are extremely dangerous. Some players may prefer to avoid this biome entirely.
Inactive Lava Zone
Depth Range: 800-1200 meters
Danger Level: Very High
Resources: Kyanite, Magnetite, Obsidian, Lava Rock
The Lava Zones represent the volcanic underwater regions of the planet, featuring magma flows and superheated chambers. Despite the extreme environment, valuable resources including Kyanite are found here, making exploration worthwhile despite the dangers.
Thermal vents provide both power and warmth in the lava zones, and creatures adapted to these extreme conditions thrive in the heat. The Sea Dragon Leviathan is the apex predator of the Lava Zones, a massive creature that guards the deepest chambers. Plan your route carefully to avoid the Sea Dragon's patrol patterns.
Lost River
Depth Range: 500-900 meters
Danger Level: High
Resources: Nickel, Lead, Sulfur, Organic Membrane
The Lost River is a massive underground cave system connecting multiple deep biomes. Its distinctive feature is the river of acidic water that flows through its chambers, slowly eroding the limestone formations and creating unique geological features.
The river water is mildly acidic and damages vehicles and equipment over time, requiring either protective modules or quick passage through affected areas. The Lost River provides access routes to several important biomes and contains its own unique resources in the side chambers.
The Lost River contains several junctions that lead to different biomes. Study the layout before exploring to avoid getting lost. Placing beacons at junctions can save hours of navigation later. The central junction is particularly disorienting due to the similar appearance of multiple passages.
Lava Biomes
The lava biomes represent the deepest and most extreme environments in Subnautica 2. These volcanic regions feature extreme temperatures, aggressive creatures, and the rarest resources in the game. Only players with end-game equipment should attempt to explore these areas.
Active Lava Zone
Depth Range: 1200-1700 meters
Danger Level: Extreme
Resources: Kyanite, Reactor-Ready Uranium, Magma Core
The Active Lava Zone is the deepest accessible biome in Subnautica 2, featuring flowing magma rivers and superheated chambers that can instantly kill unprepared players. The extreme temperatures require specialized equipment including thermal protection modules.
Sea Dragon Leviathans are the primary threat in the Active Lava Zone, patrolling the magma chambers and attacking anything that enters their territory. These creatures are best avoided entirely, as even with maximum equipment upgrades, confrontation is extremely dangerous.
The Active Lava Zone should only be entered with a Prawn Suit equipped with thermal protection and a full complement of emergency supplies. The Cyclops is too slow and vulnerable for this environment. Never attempt to harvest resources while a Sea Dragon is in the vicinity.
Lava Lakes
Depth Range: 1500+ meters
Danger Level: Extreme
Resources: Kyanite, Magma Core, Rare Geothermal Energy
The Lava Lakes are chambers within the Active Lava Zone featuring vast pools of magma surrounded by rock platforms. These areas contain the highest concentrations of valuable resources but also the greatest dangers.
Magma Core resources found here are essential for certain advanced technologies and contain unique materials not found elsewhere. The platforms provide brief respite from the magma, but they heat up over time, forcing continued movement.
Resource Summary Table
This table provides a quick reference for resource availability across all biomes:
Common Resources (Found in Shallow Biomes): Titanium, Copper, Lead, Quartz, Salt
Uncommon Resources (Found in Mid-Depth Biomes): Lithium, Nickel, Cobalt, Magnetite
Rare Resources (Found in Deep Biomes): Kyanite, Diamond, Auric, Uranium
Unique Resources (Biome-Specific): Creepvine Sample, Blood Kelp, Sea Treader Poop, Bones