Can anyone tell me if the Scavi Tour is really dark? We are bringing my elderly father with who is in physically good shape, he just has low vision issues. What kind of lighting do they have? I have read that some people have claustrophobic issues while on the tour. Are the passageways really narrow? If someone have an anxiety attack, is it easy to back your way out of there? Would someone with "mild" claustrophobic issues have any problem? Thanks for any comments on these issues.