Jellyshroom Cave

| Property | Value |
|---|---|
| Type | Cave |
| Depth Range | 135 - 305 meters |
| Temperature Range | 13.4°C - 14.3°C |
| Biome ID | jellyshroom |
| Harvesting Nodes | Shale Outcrop |
| Point of Interest | Degasi Seabase (112, -264, -359) |
| Music | Crush Depth, Crash Site, Lava Castle |
The conditions in this cave support a microcosm of unique, possibly predatory lifeforms. Try to anticipate unanticipated threats. ― PDA, Dialogue
The Jellyshroom Cave is a cave system found below the Grassy Plateaus, Kelp Forest, and Safe Shallows. Four entrances can be found at coordinates: (130, -95, -390), (-360, -110, -225), (-495, -90, 15), and (-725, -105, 0).
The area is explorable via the Seamoth, but it is dangerous to do so without a Seamoth Depth Module MK1 or higher due to the biome's depth. The Seamoth Perimeter Defense System upgrade is also advisable, but not needed, due to the Crabsnakes’ tendency to ambush the player from the Jellyshrooms themselves. Exploring the caves with the Prawn Suit is possible but challenging without the Grappling Arm and/or Jump Jet Upgrade to get back out of the caves.
Description
The Jellyshroom Cave is a large cavern characterized by a dense population of huge, translucent, purple Jellyshrooms, along with structures such as stalactites and stalagmites.
The cave system has two predatory species and two prey species. The most notable of these are the Crabsnakes residing in the Jellyshrooms, and the Oculus, both of which are found only in this biome. Shale Outcrops and Magnetite can be found here, as well as various Large Resource Deposits.
Story Spoiler
The second Degasi seabase can be found here. The entrance at 140, -86, -397 is right above the Degasi Seabases.
Resources and Items
- Crabsnake Egg
- Diamond
- Gold
- Large Gold Deposit
- Large Lithium Deposit
- Large Magnetite Deposit
- Lithium
- Magnetite
Fauna
Flora
- Cave Bush
- Drooping Stingers
- Furled Papyrus
- Jellyshroom
- Redwort
- Regress Shell
- Rouge Cradle
- Violet Beau
Fragments
All Fragments are found in the Degasi Seabase in the cave:
- Modification Station Fragment
- Moonpool Fragment
- Nuclear Reactor Fragment
- Power Cell Charger Fragment
- Stasis Rifle Fragment
- Thermal Plant Fragment
Interior
- Basic Double Bed
- Desk
- Multipurpose Room
- Observatory
- Spotlight
- Swivel Chair
- Wall Planter
- Water Filtration Machine
- Floodlight
Data Bank Entry
Environment Log
User 'Paul Torgal' requested cross-referencing of local environment scans with ideal habitat construction conditions. Displaying results.
- Large subterranean cavern with multiple entrances
- Conditions support a unique microcosm of predatory lifeforms
- Minor structural instability in cave walls
- Extensive resource deposits
Average Environment Safety Rating: C Optimal Habitat Site Safety Rating: B
Site 7 has been selected as the optimal habitat construction site for the following reasons:
- Close proximity to one of the cave entrances, in case of emergency
- Medium distance from predatory organisms
- Stable foundations on which to build
- Ready access to materials
A signal tracking the site has been created.
Achievement
Main article: Achievements
Follow the Degasi

Find the Degasi habitat in the jellyshroom cave
How to obtain: The player must discover the Degasi Seabase in the Jellyshroom Cave.
Gallery
Overview
Stalagmites, found along with a table coral-like structure
Another view in the Jellyshroom Cave
Oculus roaming the Jellyshroom Cave
Jellyshrooms and their smaller variants
An entrance to the cave system from the Grassy Plateaus
The Jellyshroom Cave, viewed from one of its entrances
Another view
An entrance to the Jellyshroom Cave in the Grassy Plateaus
A view from one of the entrances to the cave
Various species of flora in the Jellyshroom Cave
The Degasi Seabase in the Jellyshroom Cave
A Jellyshroom
A Crabsnake in this biome
A Biter in the Jellyshroom Cave
Trivia
- The abundance of Stalactites suggests that these caverns were dry-standing for several million years, only later being flooded presumably when the ceiling collapsed due to erosion - this might explain why its native ecosystem is so uniquely different from all bordering biomes.
- The ambience noise is the same as the Blood Kelp Zones.
- The Jellyshroom Cave is the only biome to feature Large Magnetite Deposits in the game.