No, was like being in your basement. Very nice tour. Highly recommend.
Everything is pretty well open. That would depend on the severity of your claustrophobia.
No, nothing is that closed in
There are some narrow walkways but there rooms are big. Think going into a basement. The cielings are high and it is well lit.
I'm a little claustrophobic as well and I had no problems.
Google images of the tour
Spaces have fresher air than I expected, ok light and room to move around.
Possibly
Its not that tight. We had a group of about 40 people and still had room to spare. There are a couple of low ceiling staircases, but other than that ot was way more spacious than i has assumed it would be.
There are some tight staircases but most of the rooms are pretty spacious. You're only underground for about 20 minutes at a time.
Thanks! Your answer is awaiting moderation.