they excite fashicination and/o fear. >> it's like religion or politics. people get really emotion. one side, these things are benevolent creatures like unicorns and would never hurt me because we have a special connection. that's bs. on the other hand, there's people who think they're absolute killers. it's really something in between. >> so we have ocean ramsey who actually swims with great whites. yep. that's a great white. >> they're misunderstand and misconstrued as ravenous, mindless man eating machines. that's not how they are. >> you're [ bleep ] crazy. >> and on the other hand, people more akin to our nantucket dude who likes to wrestle. >> ooch kcatching sharks is my favorite thing to do. just a big battle. so fun. >> reporter: shark diving might be a fun thing for us and them, but only if we do it right. >> we can't treat these animals like dogs and cats because they're not. they're predators. we have to respect them and give them credit. >> even experience divers like mark have had close calls. he was diving with a seemingly friendly tiger shark with the bahamas. he went