. >> david garrison got a first hand look at the technology with patrick rice, a marine biologist who worked shark defense. garrison, having reviewed the 15 research studies on the science, was so impressed. he listened the technology from shark defense. agreeing to pay a percentage of future sales for a shark deterrent made by a new company he and his son formed. nathan garrison got busy. four months and about $50,000 later in 2014, he and his dad joined rice in the bahamas to test a prototype. nathan, having never seen it work in person was going to shoot video underwater with sharks swimming nearby. >> i was nervous. we're hook at each other, is this really a good idea? >> his video shows rice wearing shark bands and he's safe. on another trip, a dummy. bernie, they named him. or shark bait. it is stuffed with bait. it shows sharks appearing to avoid it. the shark took bait. to be sure there's still healthy skepticism about shark bands. he admits his product won't stop a hungry shark if it really decides to attack. last week a florida teenager said he was bitten by a shark while we