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Researchers will test swimmers' saliva to track cortisol levels - a stress-related hormone - before and after cold water immersion.

For human surfers and swimmers, the results were somewhat encouraging.

Coast Guard Sector and deployed a rescue boat and jet ski with four rescue swimmers, the fire department said in a statement.

He had the shark on the line for about 45 minutes — no doubt enjoying the spectacle and attention — when a group of ocean swimmers approached.

The area is popular for fishing, as well as for some brave swimmers.