Fern, the caves were closed for renovations for a couple of years. How one renovates a cave, lord only knows... did they put up wallpaper you think?
Seriously, I can bet they added more lighting, which is a saving grace for claustrophobics I can bet. You ride through on a line of trams, and there are large open areas, with wonderous, stalagmites,and stalactites. I thought it quite an interesting excursion, worth the visit...Thinking back on the large expanse, I don't think you will have an issue.