Subnautica Codexery

Jellyshroom Cave

A glowing subterranean network connecting the trench to the lost depths of 4546B.

The Jellyshroom Cave is a distinctive subterranean biome located on Planet 4546B, characterized by its dense network of tunnels and unique flora. It serves as a critical transit zone for survivors navigating the mid-depths, offering shelter from the open ocean while providing access to deeper, more dangerous regions. This area is renowned for its bioluminescent ecosystem, where giant fungal organisms provide light in the absence of sunlight. While generally safer than the surrounding trenches, it requires careful navigation due to tight passages and specific fauna that can hinder progress.

Quick Facts

Biome type
Cave System
Depth range
Approximately 100m - 250 m / 820 ft
Temperature
Cool
Key resources
  • Jellyshroom Gel
  • Copper Ore
  • Gold Ore
Primary hazard
Jellyfish Stings
Map connection
Blood Kelp Trench to Lost River

Lore & Background

Biologically, the Jellyshroom Cave represents a fascinating adaptation to low-light environments. The massive fungi that line the walls emit a soft violet glow, likely produced through bioluminescence to attract pollinators or deter predators in the dark. This light source creates a unique micro-ecosystem where jellyfish congregate, feeding on plankton trapped within the currents of the cave system. From an evolutionary perspective, these caves act as natural barriers and bridges. The narrow tunnels protect smaller creatures from larger apex predators found in the open water, yet they also funnel movement for explorers seeking to reach the Lost River. The presence of rich mineral deposits suggests geological activity beneath the surface has fractured the rock, allowing groundwater and nutrients to sustain this hidden garden.

Reader's Guide

The Jellyshroom Cave exists primarily within the mid-depth ranges of Planet 4546B, typically spanning from one hundred to two hundred and fifty meters below the surface. Temperatures remain relatively cool compared to the volcanic zones, making standard thermal protection sufficient for extended exploration. This biome is a vital source of Copper Ore and Gold Ore, essential for early technology upgrades. Players will also find Jellyshroom Gel here, a unique resource used in crafting various tools and lighting equipment.

Environmental hazards are present but manageable with proper gear. The primary threat comes from the resident Jellyfish species, which deliver painful stings that drain health over time if not avoided or countered by protective suits. Oxygen management is critical due to the labyrinthine tunnel structure; narrow passages can trap divers without a Rebreather. Notable points of interest include the main entrance branching off the Blood Kelp Trench and several tunnels leading deeper into the Lost River ecosystem.

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