What is the largest cave in carlsbad caverns?

"Carlsbad Caverns" IS the cave. Its largest chamber, as far as I can make out (the internet's not all it's cracked up to be for finding information!), is known as The Big Room. Note: The Word "chamber". I'd used that as a British caver, but I believe US cavers usually use "room" for the same thing: a discrete cavity within a cave, and distinctly larger than the passages entering it.