Thank you all for your interest. I don't have access to a pool as I live in a very small village (1020 souls) right in the Alps near the Swiss border..... The nearest town with - possibly - facilities such as you described is about 1 1/2 hours drive away....

The oxygen helmet I showed is similar to the one they were 'testing' when they used it on me... This was the only thing I could find on the web to show what it was like. Here are the other details for it....

http://www.hbot4u.com/trinity.html

europa