Earthen Coral Tubes (Subnautica)

The Brown Coral Tube is a type of coral that is found in the Lava Caves. It grows on the sides and ceiling of the caves and is purely decorative.

Appearance
Brown Coral Tubes are a somewhat round, light brown tubular coral that ranges from being short and rotund to long and skinny. They are almost always found in groups of twenty or more. The inside of each tube has an orange bioluminescent glow.