Mm, wow. A lot of space and comments to devote to just one trip! I am impressed with the immense clarity with which you recounted your experiences. Here are my comments on it, in order:
~52-degree incline? ...Wow. That's...pretty steep...
~Fresh air with pure oxygen? Do you mean 100% oxygen (instead of the usual ~25% that air normally has), or just more oxygen than usual in the air (say, 40%)?
~Exact same words at the exact same time? Sounds like the twin sense in action.
~A real opal? Wow, pretty. Are those hard to find or just really pretty?
~