Earthen Coral Tubes (Subnautica)

The Brown Coral Tube is a type of coral. It grows on the sides and ceiling of certain 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 some tubes has an orange bioluminescent glow.