When an individual possesses very high personal skills and competencies for a given activity and then engages in an activity with a very low opportunity for challenge, he or she will most likely experience:

boredom

Explanation:

According to my research on the flow theory, I can say that based on the information provided within the question he or she will most likely experience boredom. This is because people with high competencies need to be challenged otherwise everything becomes too easy and they begin to get bored relatively fast, until a real challenge arises.

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"the sandy walls seemed to collapse in on themselves"

and

"the bloodshot waters seemed to have no bottom"