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,
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!""
Not sure quite what you are asking about, but anyway it is more accurate to ask what kinds of rock hold the caves, not what rocks are in the caves. Most caves are in limestone, a sedimentary rock, irrespective of water-level. There are a few caves in igneous rock: lava-tubes in basalt-flows, but on land, not underwater. There are also a good many caves in marble, the metamorphic but still-soluble form of limestone; and again the water-level is secondary to the cave itself. A few caves exist in rock-salt, an evaporite.
robots
Erosional caves are formed by the action of water or wind.
Other way round! Water and/or air are in caves.:-) Most of the world's caves have formed / are forming in limestone.
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.
Cro-Magnon used a variety of shelters, including caves, overhanging cliffs, and temporary structures made from animal bones, hides, and wooden poles. They also used natural materials such as leaves and branches to construct shelters when needed. Their choice of shelter depended on factors such as season, location, and availability of resources.
The acid in the water forms it