Hoag
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@Marie13, sounds like you had a fun day. Over the years, I have done a number of chamber rides for work, but we always went the other direction. We would start off at the local altitude & and breathe 100% O2 for 30 minutes to reduce our N2 levels as much as possible, then "climb" on a specific profile to a specific altitude. In some cases, we went up to (simulated) 30,000 feet and took our masks off and had to do a test to show us the effects of Hypoxia. (In many people it is similar to the effects of Nitrogen Narcosis, but the truth is that it manifests itself differently in every person.) In other cases, it was an almost instantaneous (less than 1/2 second) "climb" from surface to (simulated) 25,000 feet to simulate explosive decompression. Maybe I am a bit twisted, but I always looked forward to the chamber training and had a fun afternoon. (Spatial disorientation training on the other hand ... not so much fun.)