>> watch more "faultlines" on demand or visit aljazeera.com/faultlines. explore. i'm phil torres. tonight sharks. both people avoid sharks. we're out to meet them. tag them. learn all about this pep. >> sharks don't eat people. >> five days and nights at sea on our especially rigged shark laboratory. exhort research is next. lindsay moran is an ex-c.i.a. operative, and 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 bahama bahamas 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 prepared 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 i it deal with reproduction? >> we set out the baits. >> bait in the water. that is nice looking fish. >> once all eight lines are set we wait for the sharks to bite. sometimes they don't. and then suddenly a sighting. and everyone swings into action. >> yes, baby, the first tiger of the trip. >> you we're fishing with the drum lines.

what the drum lines allow us to do, they hooked in large circles. which means that they're not fighting and impairing movement. >> get the line, get the line, get the line. >> get the tail. wait, i want to get the tail rope on. can you cut the engine? let's get it on. ready to come on. right after me. it's a female. hold that tail up. get the tail out of the water. >> they've been trying to pull this thing in for ten minutes now. it's huge, it's a tiger shark, and the first one of the expedition. it's really exciting. >> the first one is always the toughest.

he's so big get that pump in. >> he insert a pump into their mouth. that's great because one thing they get to bite down on something and it makes them feel better about it, but two, it's artificially helping them to breathe, pumping oxygenated saltwater in their mouth over their gills. >> carolyn is an undergrad at the university of new england shark and research lab. she is one of the most crucial jobs, using this veterinarian's ultrasound to see if the shark is pregnant. >> tiger shark are tough because they're so massive, we can't get the whole uterus in one shot. >> this shows that this shark was not pregnant. the next major task, surgery to implant this transmitter inside the shark. >> this is the size of a small battery but it has enough

battery power to transmit you will are a sonic signals for serve years while the animal is out there swimming. >> the they take detailed measurements. >> tiger sharks, which are predatory sharks, are really built, in many cases, ambush. they're made for short bursts of speed. >> what you look at the tiger shark what can you tell me about its feature. >> the first thing you'll notice is their large blunt head. the their athlete are designed almost like a can open. >> blood and finish samples are taken before the hook is removed from the mouth and the shark released. the whole process takes about 20 minutes. >> one, two, three.

>> it was spectacular. it swam down to the bottom, leveled off. jason stayed with it for an unbelievable amount of time while i was gasping for air. >> it's a learning curve with an one-ton who doesn't want to be on the boat. >> this will help neil track it's every move in tiger beach. how, by sending a signal to one of these. >> this is a hydrophone. the electronic gear . >> this trip the doctor hopes to install 32 hydrophones located throughout tiger beach . >> each reefe receiver will tell you when it detects a shark

with the receiver. >> the work has just begun. coming up next we'll find out if she's pregnant. >> we want to hear what you think about these stories. join the conversation by following us on twitter and at www.aljazeera.com. >> we're following stories of people who died in the desert. >> the borderland marathon. >> no one's prepared for this journey. >> experience al jazeera america's critically acclaimed original series from the beginning. >> experiencing it has changed me completely.

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>> the very positive thing, and this, it's underwater.

that's really good. >> this is a tiger shark. >> it's not long before the platform is put to the test by an 11. 11.5-foot tiger shark. [ yelling ] >> since the shark is dorsal finish up, tissue samples are taken first. and then blood is drawn. it will provide a wealth of information, the kind that scientists used to get only by sacrificing the shark. >> in the past if you wanted to see what it was eating we would cut it open and look at its stomach. but now we can look at the chemicals to see what they're

eating. >> the shark is flipped over, and carolyn begins her ultrasound. >> she is pregnant. >> wahoo! >> we got a pregnant one! >> inside this big bloated tiger-shark belly are a bunch of baby sharks. the first female that we have found that is pregnant. we also need to track where they're going so we can understand their breeding behaviors. right now that's what they're doing. they're implanting the transmitter to give precise details. >> she's given a satellite tag to track her movement. >> the satellite tags are bolted to the finishes that have no nerves, just cartilage. we're using medical-grade titanium yum to hold it on, and that makes sure that that tag

will fall off eventually. >> woo! [ clapping ] >> that was awesome. >> the team will follow her wherever she goes on google earth. of course, i had to check out the ultrasound. >> so you can see these kind of definitive circles so that this is the top here. this is th one here. >> this shows one of the pups. >> i'm counting three or four pups in just that area. how many total do you think there are? >> there definitely could be a lot more. you can see that they come in and out of focus. it can be difficult to count. on

this one i counted approximately 10 per side , 20 total. >> should we finish this up? >> time to swing back in action. there was a lot of action over the course of three days. the team had caught a total of 15 sharks. >> i know we call it tiger beach, but this ain't no beach holiday. >> this shark caught on day three turned out to be pure gold for research. she was a female the team had tagged before in october on their last expedition to tiger beach. >> this is their first recaptured shark. in october she was pregnant. now we can't to find out what happened. >> now we're showing that she's not pregnant. that's really exciting. that means that we can use the acoustic tag data to see where she has gone to give birth. >> how huge is that data point for you guys? >> oh my gosh, it's the holy grail for the type of science that we're doing. >> this is a recapture.

i could not believe it. i was thinking, one of our sharks. this is why we're here, to try to determine their nursery ground. if we protect those important areas we can have a substantial conservation impact on this animal. >> there are over 100 million sharks being killed every year. not just for food, but as by-catch. something needs to be done, and you can't conserve an animal unless you know something about it. sharks are such mysteries. as much as we talk about them, we know very little about them. >> are we seeing tangible results that can be adapted to take on conservation measures? >> i think so. the thethey had high pot these

hypothesis, but maybe they come there to get warmer, increase gestation, get for food. now they're starting to get solid answers. >> how dangerous is that work? i notice the wound on your hands. >> i should have covered up more. shark sin is incredibly rough. it's like sand paper. at first you don't notice it, but my shins were cover covered. you can see on instagram that i was pleading for science. it's my own fault because i should have been wearing a wetsuit. >> sharks have this reputation for coming in to eat us all, but that's not the case. >> before going in to this case i had a certain opinion of sharks, and the danger of them. you see the passion behind these people and the evidence when they're out there petting these sharks in the ocean, it convinced me, and now i love them. you'll check that out after the break.

>> next. al jazeera america presents. >> this is it. >> oscar winner alex gibney's "edge of eighteen", thanksgiving marathon. >> oh my god! >> intense pressure. >> if i said that i'm perfectly fine, i would be lying. >> tough realities. >> i feel so utterly alone. >> life changing moments. >> in this envelope is my life. >> if you don't go to college you gonna be stuck here... i don't wanna be stuck here. >> catch the whole ground-breaking series. "edge of eighteen". thanksgiving marathon. next. only on al jazeera america.

you. >> welcome back. i'm phil torres, guys, we're about to see the final part of this shark expedition. it was incredible intense week of hard work, and it was driven by passion for sharks and helping to conserve them. you're about to see just what i mean. sharks are nice, and the world doesn't know this. >> jim abernathy loves sharks, and he wants you to love them, too. that's one of the reasons he became a pioneer in cage-free shark diving.

>> in florida we have a dozen . >> yo you were bitten by a shark. are you concerned by your safety? >> no, the shark that bit me happened while i was tending to the bait. i had hundreds of thousands of bait in my hands. it bit me in my arm and released

me. it further proves to me that sharks don't eat people. the only reason they bite someone is a case of mistaken identity. >> oh, my god, check this out. >> they're feeding on turtle s. >> they all want to spread the same tiger shark love. >> i really want these sharks to survive. we name them and i wish people could appreciate them for what they are. >> nothing else matters. >> we hadn't seen julia for a while. she showed up on the third or fourth day. yeah, all right, she's here. it's embarrassing, now that i

think about it. >> your crew gives affection to sharks . >> i quickly realized that sharks like affection. it was very trusting, and i could pull it in and see the hook in its jaw and simply pull it out. it doesn't take very long to figure out that neil really loves sharks. he's answering the questions that the non-profits need in order to put the right rules into place where it can be very impactful for the future of sharks. >> the doctor is hoping his research at tiger beach will help him answer some of those questions. >> do you have any data on the shark that we captured? >> sure do.

that's the first thing that we looked at. when you look at the data, what does at a tell you? >> she stuck around. sh >> he was there from then to now. between the last time we has saw her and now she gave birth. >> is there a possibility that she gave birth at tiger beach. >> if you look there is a gap by a handful of days, the question is did she give birth and then come back to tiger beach? i can't put my finger on it yet, but if i play around with the data and get recaptures you can see the puzzle pieces coming together. >> when the shark is up here and you're processing it, it looks like that's when the research happens. it swims away, and it doesn't end there. >> definitely not. you're seeing the precursor. right now while we're having this conversation the sharks are doing my work for me so i can do this.

>> you know, it brought me back to my days in the rain forest. i just love that feeling of working with a team, working hard in tough physical conditions. i was just amazed. there were two young women there who were juniors in college, and they're out there doing this work. i'm always just amazed with science careers because a lot of young people out there don't realize what they could be doing as their summer job when they're 20. >> that's incredible footage. how did we get that? >> it was awesome. we were shooting above water. we were shooting in the water. jim abernathy had this great set up in there, just the perspectives they were getting and the fact that we caught 15 sharks and processed 15 sharks, the way the camera could focus on different aspects of the operation. >> the shark was not the menu. >> no, they were against eating

shark fin soup. but i had a really good sea sick medicine that pricingly surprisingly i did all right. >> thank you for taking us on that journey with you. >> i hope it affected you as much as it affected me, and my view on sharks was completely different. we'll see you next week here on techno . >> go behind the scenes at www.aljazeera.com /techno. follow our experts on twitter, on tech know, >> i landed head first at 120 mph >> a shocking new way to treat brain injuries >> transcranial direct stimulation... don't try this at home... >> but some people are... >> it's not too much that we'ed fry any important brain parts... >> before you flip the switch, get the facts... >> to say that passing a low level of current is automatically safe, is not true >> every saturday,

go where technology meets humanity... >> sharks like affection >> tech know, only on al jazeera america i am thomas drayton in new york, here are the top stories we are following at this hour. a mother and son are reunited four years after the child went missing. the 13-year-old managed to contact his mother from inside the home of his abductors. authorities searched and found the child behind a safe wall. place have taken five people in custody. darredarren wilson who fatay shot unarmed team ager michael brown has resigned from the police deem. on wednesday wilson's lawyers have said the resignation was in the works. wilson said he quit after the department told him they were getting violent threats if he remains on the force. wilson says he didn't want to put fellow officers in dange