What is our stress level in comparisons with SCUBA divers?

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What is our stress level in comparisons with divers constantly changing
conditions?

I found this article is quite interesting regarding of fear of changes and
psychological aspects of mind and body.
“Fear is not always a bad thing. It can be a positive
emotion, promoting survival by leading us to cope with anticipated danger. Fear
prevents us from exposing ourselves to undue hazards and prepares us to deal
with surprise situations.”
http://www.dtmag.com/Stories/Dive%20Psychology/03-98-feature.htm

“The Personal Limits of Fear.”
Mind and Body
By Robert N. Rossier