By ALEX DRUDE
Tiburon's John Hullverson first took up freediving because he got injured training for a triathlon and wanted to keep moving. A lifelong swimmer and a scuba diving instructor for more than 20 years, he researched freediving, took a course while in the Cayman Islands and was hooked.
"Nothing like getting down 100 feet underwater and having operating time — to be down there for 2-3-plus minutes and looking at whales, dolphins and every kind of fish you can imagine," he says.
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