stephanie sy reports. >> reporter: sharkmen are trying to unlock secrets. chris fisher and brett mcbride have the job of catching them. >> see him on the swordfish? he's right there. >> reporter: it's chris' 120-foot boat that's specially equipped to lift a 5,000-pound shark out of the water. his long-time buddy, brett, is the captain. >> i'm not seeing blood. >> okay. >> reporter: and also, the brave soul who ends up with his hand down a great white's throat, trying to wrangle a hook out. so, you felt because you had done it with other fish, you could do it with a great white shark. >> it wasn't my first choice. i got really thrashed doing it. my arms were really shredded, from my elbow to my i both sides. i was so concerned for the shark's safety. i saw everything slipping away. it was my worst nightmare. >> run it up here. >> okay. he's beached. >> reporter: one of the biggest criticisms of this land, tag and release method, is the danger. not only to the handlers. >> that was super sketchy. almost lost your arm. >> one, two, three, four, five. got them