Do you mean "water in caves"? That depends on the individual cave, but passages can vary from being permanently full of water to being abandoned and left high-and-dry bylosing their formative streams.
Bats, rocks, water stream, bears, rats,
Stalactites in caves are typically formed from minerals such as calcite or aragonite, which are deposited by dripping water containing dissolved minerals. These minerals precipitate out of the water over time, creating the elongated formations we see in caves.
differential weathering water wears away some areas but not all
Karst caves, and it is the majority of caves; formed by acidic ground-water dissolving the limestone.
large caves, streams by water, places with shelter, ect.
There can be, either at the sea's edge or under water. "I said: "Go up, dear heart, through the waves; Say thy prayer, and come back to the kind sea-caves!""
robots
Glacier or glacial caves. They are developed by melt-water from the glacier's or ice-sheet's surface melting the walls of cracks that allow the water to flow through the ice mass; or along the surface of the ground below a glacier.
Other way round! Water and/or air are in caves.:-) Most of the world's caves have formed / are forming in limestone.
The acid in the water forms it
The most common types of cave are limestone caves.
the 1st thing caves are full of is water