Yes. Underwater caves do exist. Many formed when sea levels were lower than they are now and were flooded when sea levels rose.
The Bioluminescent Mushroom lives underwater.
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.
blue holes are inland underwater caves that form when land collapses, creating a sinkhole.
underwater caves are formed when over a period of time, tides smashes the rocks and erodes it. gradually, it forms an underwater cave. +++ It's true that sea-caves, as the answer states, are formed by erosion by wave-action, and they can hold deep water, but I suspect the questioner is asking about true underwater caves. If so: Undersea cavessuch as the Blue Holes are normal terrestrial karst caves formed in low-lying limestone at a time of depressed sea-levels (the glaciations), then drowned as sea-level rose when the ice-cover retreated. Water-filledcaves on land areagain simply normal limestone caves, but the passages have formed vertically-sinuous profiles that trap water in "sumps",rather like the U-bend under the kitchen sink.
Caves can be found all over the world, in various environments such as mountains, deserts, and even underwater. Some famous cave systems include Mammoth Cave in Kentucky, the Caves of Cappadocia in Turkey, and the Waitomo Glowworm Caves in New Zealand.
Underwater Spelunking
No life.
No, sorry there isn't.
no they live in rivers
You can't.
In the underwater sealed cave and in the three regi caves
yes they do but they are born in underwater caves.
Deep Sea Detectives - 2003 Secret Underwater Caves 2-9 was released on: USA: 19 July 2004
By going underwater into the muddy caves once they seek predators
true
Deep Sea Detectives - 2003 More Secret Underwater Caves 3-8 was released on: USA: 20 June 2005
The Bioluminescent Mushroom lives underwater.