The passage from Ponderosa to Eden is technically cavern and large enough to fly a 737 through. Perhaps you could suggest your guide start with that cavern line. If its still uncomfortable then you can just snorkel in the basin instead of going on any other lines.Let me take advantage of your post and ask you this…I am planning to dive Ponderosa in August. Is it open for most of the dive? I am slightly claustrophobic.
thanks