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A cave or cavern is a hollow place in the ground, especially a natural underground space large enough for a human to enter. Caves form naturally by the weathering of rock and often extend deep underground.
Webster's defines a cave as  a natural chamber or series of chambers in the earth or in the side of a hill or cliff . So I guess the could be caves, but I'm not sure how deep they can go. The ones we walked in were rather shallow. There were some spots where in the side of the tube smaller vein like tubes ran.