. >> we named the shark colossus. >> that is the filmmaker jeff kerr off of seal island, and the sharkthe surface while shooting the 2012 shark week. >> after he made the legendary breach on top of me, he disappeared after that. that got me wondering, what happened to him? >> to kick off shark week 2014, jeff and a team are searching. >> they are on a research boat off the african coast hoping to put a satellite. >> we want to track a male shark where he might be. >> this is part of the shark week kickoff, a show called "air jaws," which is awesome, and to tell us about it, we have jeff via skype "right this minute." if this is the show, dude, did you find him? do you have an idea? >> that would spoil the show, wouldn't it? this is about is the journey, getting closer to the great white sharks than anyone before. it was a hair raising journey into that world. >> markings that makes you know that that's him. >> yeah, his dorsal fin, the fin from the back, that's deformed. we knew if we found that fin, we had him. >> what are some of the theories as to what happened with him? why did he

. >> reporter: for 23 years, jeff kerr and chris fallus have braved shark-infested waters, pursuing onef the world's deadliest predators in the name of science. now they're on the quest to fiend this 14-foot-long, 3,000-pound great white shark. >> i first met collosus in 12011 in the iconic breach seen around the world. i found out a year later, collosus left his famous hunting ground at seal island. nobody knows where he went. >> reporter: these waters are filled with great whites. to find collosus, curt and his team rely on a ground-breaking new clue. >> on the dorsal fin, see that indentation. >> reporter: following the lead, kerr and his team of experts, began terrifying tactic after terrifying tactic. >> trying to get the tag behind his dorsal fin. >> reporter: to aid their two-year search, the duo invented and test cutting-edge new devices. >> whoa! >> reporter: the shark stalkers traveled from south africa to new zealand only to find even larger sharks. >> watch out! >> reporter: with him coming close to a gang of great whites. but at the end of the day, kerr says he would do any