Excitement erupted across the Subnautica fandom today after a leaked biome list for Subnautica 2 surfaced online, hinting at both eerie new ecosystems and the triumphant return of a beloved classic: the haunting Lost River.
The list, reportedly sourced from a playtester’s anonymous Reddit post, details 14 biomes slated for the sequel. Alongside fresh horrors like the Twilight Trench (a high-pressure abyss teeming with bioluminescent predators) and the volatile Magma Caldera, one entry stood out: "Lost River Variant – Expanded Sulfur Caves & Ancient Skeleton Site." Fans immediately flooded social media with celebratory memes and theories about how the eerie brine pools and fossilized Leviathan bones might evolve in the sequel.
"The Lost River was peak atmospheric dread in the original game," commented Reddit user DeepDiver07. "If they’re bringing it back with deeper lore and scarier creatures? I’m sold."
The leak also hints at two other legacy biomes: the Mushroom Forests (now featuring colossal fungal towers) and the Koosh Zone (renamed "Electric Kelp Fields"). New additions include the Floating Islands—a sky-biome accessible via vertical geysers—and the Crystal Caverns, described as "a labyrinth of razor-shine crystals that refract laser-based fauna."
For a full breakdown of the leak, watch this analysis from Underwater Theorists:
Subnautica 2 BIOME LEAK: Lost River Returns!
The original source, shared to r/Subnautica, includes cryptic notes about dynamic ecosystems (e.g., migrating herds of "Sand Whales") and biome-specific survival mechanics. Developers Unknown Worlds have yet to confirm the list’s legitimacy, but the studio’s silence since the leak has only fueled speculation.
See the full leaked list and join the debate here:
r/Subnautica Leak Thread
With rumors placing Subnautica 2’s release in late 2026, one thing’s certain: the return of the Lost River has already cemented its status as the sequel’s most hyped locale. Now, if we could just confirm those Shadow Leviathan rumors…
What’s your dream biome? Sound off in the comments!
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