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- "Reminds me of Dagobah. Dunno why the Force seems to love caves so much."
- ―Luke Skywalker, in a cave on Serelia

A cave,[2] also known as a grotto,[3] was a void in a section of rock or dirt. Some caves, often called caverns, were large enough for sentient life to build cities in them.[2] The surface of the planet Bilzen was covered in frozen caverns.[4]
At a test firing of the DS-1 Death Star Mobile Battle Station, Lieutenant Commander Orson Callan Krennic stated violence was part of every sentient species, noting that it was painted in caves.[5]