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.


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 predatorial species, and two prey species. The most notable of these are the Crabsnakes residing in Jellyshrooms, and the Oculus, both of which are found only in this biome.

As the Jellyshroom Cave can only be accessed from above by small openings in the ground, it is completely inaccessible to the Cyclops.

Spoiler alert: The following section contains story related material.

The second abandoned seabase built by the survivors of the Degasi can also be found in the Jelly Shroom Caves.


For a more complete gallery, visit Jellyshroom Cave/Gallery.


  • 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.