bahamas sbahamas bahamas, in the name of sharks. let's take a look. >> shark on! >> shark. the very name inspires wonder and fear, vilified as the world's ultimate killing machine, but their bad-boy image is all wrong, according to these guys. >> i haven't had a single bad day with sharks in 35 years of doing business. >> if there is a shark around, you're likely to find jim in the water with the camera. >> we have 400 billion years of sharks shaping our ocean's health. and in the last 50 years on my watch we've literally destroyed it. >> one in six of all sharks that have been threatened with extinction . >> the university of miami, one of his primary missions is to study sharks in the wild so policymakers can make good policies based on science. >> i really can't express the word of value that jim brings. he can get to sharks. he can figure out what the best conditions are, and he can help us design our information based on the health of the ocean. >> this is where you will find him, making sure that the shark and the team are safe while they gather data. they're getting ready for an five-day exhibition off the shores of bahamas. the goal is to tag tiger sharks. and techno was invited along on the mission. >> people often ask me why should we care. as an apex predator, meaning nothing eats them. they're at the top of the pyramid. they play an important i can logical role. when you remove them, that could effect others members of the community. >> i join neil and his team at the lab in miami as they back the research gear. >> it's better to be over prepareed than under prepared when out in the ocean with tiger sharks. >> then we board with the crew. >> this is your home for the next week. the ultimate shark diving route. >> this is my new home. >> yep. >> after a rough overnight passage we head towards destination a special place called tiger beach. it's not a beach. in fact, it's about 20 miles offshore, but it's got plenty of tigers. >> this area is largely dominated by tiger female sharks. which is interesting. why are there not males here? could it it deal with reproduction? >> we set out the baits. >> bai