Very interesting, thorough and believable article, especially when they compared the likely chemical composition of the gases to those inhaled by modern druggies who huff or inhale similar chemicals, and noted the similarity of their trance-like reactions.
I’ve never been to Delphi, but I have visited the cave of the Oracle of Cumae in Southern Italy, which was settled by Greeks and mentioned in the postscript to this article. Unforgettable experience.
That sounds like a really interesting trip. To visit one of those caves. Wow. I’d love to feel the atmosphere there.