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The World Tree is a biome on Proteus in Subnautica 2. The name was discovered by community members who spotted file names visible in the background of a dev vlog video. It is one of the most evocatively named biomes on Proteus, implying a colossal organic structure, potentially a single enormous organism, that defines an entire underwater zone's ecology.
What the Name Suggests
"World Tree" evokes a massive biological structure forming the foundation of an entire ecosystem. In terrestrial mythology, a world tree is a cosmic tree connecting different realms. In the context of an alien ocean planet, the name suggests an underwater organic formation so large that it functions as terrain rather than just flora: other creatures, plants, and resources would exist on or within the structure rather than simply near it.
Discovery
The World Tree's name was identified through the same method as other Proteus biome names: file names visible on a developer's screen during a dev vlog. Community members spotted folder and asset names referencing specific biomes, and the list was shared in community forums and the official forums. Unknown Worlds has not released official descriptions for individual biomes beyond what was shown in the vlogs.
These names come from development files and may not represent final naming. The developers stated biome names could change before or during Early Access.
Handcrafted Design
Like all biomes on Proteus, the World Tree is entirely handcrafted rather than procedurally generated. Level Designer Artyom O'Rielly confirmed: "Each zone is thought through and designed by hand." The environment team uses custom tools including MeshBlend (seamless mesh blending) and the Tufa Kit pipeline (detailed rock formation creation) to build Proteus's terrain. For a biome centered on a massive organic structure, these tools would need to handle the transition between biological surfaces and surrounding geological terrain.
What Remains Unknown
Its Early Access status is settled: the World Tree is not a visitable region in the shipped build, and it is tied to the announced future Xanadu region rather than to a launch biome. See Biomes for the confirmed region list. What is still unknown, as of September 2026, is everything about the structure itself.
What the World Tree actually looks like at close range: size, shape and species.
Whether it is a single organism, a colony, or a geological formation carrying organic growth.
Its depth range and where it sits in the progression once Xanadu opens.
Which creatures and resources belong to it.
Whether players will explore its interior, climb its exterior, or both.
Its narrative weight, in particular any connection to the Blight or to the moon's wider ecology.
Titan-Class Organism
The World Tree is classified as a Titan-class organism in current Early Access reference material, a tier above the standard Leviathan-class set documented under Leviathan-Class Organisms. It is dormant in the live build and is not a visitable region, so it does not act as an immediate threat the way the other apex creatures do.
Location At The Map Edge
The World Tree sits at the far edge of the map, beyond the Void that Shiver Leviathan packs patrol. It reads as a distant landmark rather than a destination: the region that would hold it, Xanadu, is out of bounds in the current build, and the Chapter 1 ending points the player toward it through an Axum transmission rather than through a route. Reaching it is gated until a later Early Access update.