dr. shay is an engineer, and dr. crystal dilwort h is a scientist. that's our team. >> hello, welcome to techno. i'm phil torres joined by lindsay moran, dr. shay somora and dr. dilworth. i just got back with an exciting week of my life, and it was all for science. with you jump on an one-ton tiger shark? well, that's the opportunity i got to do with these researchers based out of university of miami. we went on a boat in the 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