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A deep dive into every system, biome, creature, and mechanic. If you love Subnautica, you'll love this — and it's completely free.

Core Systems

Open-World Exploration

Planet Nereus-7 is a handcrafted alien ocean spanning over 50 square kilometers and reaching depths of 3,000 meters. No procedural generation — every cave system, coral formation, and alien ruin was deliberately placed.

  • 12 distinct biomes with unique flora, fauna, and environmental hazards
  • Full day-night cycle affecting visibility, creature behavior, and bioluminescence
  • Vertical progression — each depth tier reveals entirely new ecosystems
  • Hidden caves, wrecks, and alien structures reward thorough exploration

Survival Mechanics

The ocean doesn't want you alive. Every dive is a calculated risk — manage your resources or become another lost soul on the seafloor.

  • Oxygen management — deeper dives require upgraded tanks and rebreathers
  • Hunger and hydration — harvest alien fish and purify water to survive
  • Thermal regulation — volcanic vents scorch, frozen depths freeze
  • Pressure resistance — your body and vehicles have depth limits
  • Radiation zones near certain alien structures require protective gear

Base Building

Construct sprawling underwater habitats at any depth. Every room serves a purpose, every wall holds back the sea, and every expansion tests your engineering against the crushing pressure.

  • 40+ modular room types — corridors, multipurpose rooms, observatories, moonpools
  • Hull integrity system — deeper bases need more structural reinforcement
  • Power grid — solar, thermal, nuclear, with transmitter relay networks
  • Functional rooms — fabricators, medical bays, vehicle docks, aquariums, scanners
  • Vertical stacking with ladders and multi-story designs

Crafting & Progression

Over 300 recipes spanning survival tools, advanced equipment, vehicle upgrades, and base modules. The deeper you go, the more powerful the technology you unlock.

  • Fabricator-based crafting from raw materials to finished products
  • Blueprint scanning — find alien fragments to unlock advanced recipes
  • Tiered progression from basic survival gear to Precursor-level technology
  • Vehicle modification system with depth modules, weapons, and utility upgrades

Vehicle Fleet

Four purpose-built submersibles, each engineered for a different frontier of the deep. From the nimble Orca Scout to the massive Atlas mobile base.

  • Orca Scout — Fast single-seater, 200m depth, solar-powered, sonar suite
  • Mantis Exosuit — Bipedal mech, 900m depth, swappable arms (drill, grapple, claw)
  • Atlas Submarine — 54m mobile base, 1,500m depth, internal docking, buildable interior
  • Abyssal Crawler — Deep-sea walker, 3,000m depth, six articulated legs, maximum armor

Story & Lore

Nereus-7 holds secrets buried for millennia. An alien civilization called the Architects vanished from this world — their technology still hums, their guardians still patrol, and their final message waits in the deepest trench.

  • Non-linear story told through environmental exploration and data logs
  • Precursor alien ruins scattered across all biomes
  • A telepathic entity deep below the surface calls to you
  • Multiple story threads that converge in the final act
  • The truth about Nereus-7 changes everything you thought you knew

Notable Creatures

Abyssal Leviathan

Leviathan

120m apex predator with bioluminescent lures. Patrols the deepest trenches. Generates EMP pulses that disable vehicles.

Reef Stalker

Aggressive

Pack hunter found in kelp forests. Collects metal salvage and becomes territorial near nesting sites.

Crystal Serpent

Aggressive

Hides within crystal formations and ambushes prey. Its crystalline scales refract light, creating disorienting patterns.

Phantom Ray

Neutral

Semi-transparent manta-like creature. Harmless unless provoked. Its bioluminescent trail marks safe passages through dark biomes.

Thermal Wyrm

Leviathan

100m serpentine creature living in volcanic vents. Breathes superheated water jets. Guards the approach to the Ancient Ruins.

Drift Jellyfish

Passive

Swarms of bioluminescent jellies that drift through every biome. Completely harmless. Their glow intensifies at night.

Warper

Aggressive

Architect-created guardian that teleports. Hunts infected organisms. Fires teleportation projectiles that displace you from your vehicle.

Emperor Whale

Passive

Largest passive creature. Carries a miniature ecosystem on its back. Its deep-frequency calls can be heard across biomes.