Caves and caverns are natural or artificial cavities in the ground. They are generated by plaque tectonic mechanics, weathering or artificial excavation.
Speleology is the science of exploration and study of all aspect of caves and the cave environment.
Another profitable activity, depending on the celestial body where the cavern is located, is the collection of harvestables.
Caves are often the destination of on-planet Investigate missions where the player will have to traverse the depths of the cave.