I wouldn’t have expected that. In a way it seems kind of impossible too. Agoraphobia would be more appropriate if you come to think of it. But no. Claustrophobia is the correct term here. A while ago I heard about caves in Manitoba. My first thought was that these would be way up north, where no normal person can go on a Sunday afternoon.
Then I saw some pictures from people that had been there, those “caves” were not caves at all. They were crevasses in limestone, much like crevasses in a glacier. Only warmer and less slippery.