reminiscent of the coast concordia. before we leave you an update on flight 370, 40 days since it vanished. the bluefin-21 in the middle of the ocean and don lemon will have more details in his special report which starts at the top of the hour. this is cnn breaking news. this is a cnn special report. the mystery of flight 370. i'm don lemon. bluefin-21, the navy's underwater vehicle is searching the floor of the southern yand ocean at this hour. it was sent down 12 hours ago and is expected to remain in the water for another 12 hours or so until 10:00 a.m. eastern time on wednesday. we have learned this afternoon that engineers now believe they can program bluefin to go deeper than originally planned. the first mission was aborted

only six hours when it went below its current maximum depth limit. bluefin did not find debris on monday. and as the search goes on there are many more questions than answers. you have been tweeting your questions by the thousands and we have top aviation experts standing by to answer them for you. like this one, what other assets exist that could be used to locate the wreckage? >> we begin with more breaking news out of south korea. that country's coast guard reports a passenger ship carrying 450 people is sinking off the southwestern coast. a news agency in south korea reports that 320 of the passengers are high school students on a field trip. the coast guard reports 82 people have been rescued so far. cnn's paula hancock is at our bureau in seoul. what more can you tell us?

>> there's discreptcy in numbers at this point. as you can imagine as this is early hours of this disaster. it happened two hours ago, we understand. this ship that was heading from the capital to jeju. it was 9:00 in the morning that there was a distress signal. there were 350 people on board. there's discrepancy in the numbers. 86 they say have been rescued at this point. we heard a live press conference that said everybody on board was with ordered to jump off the ship and jump in to the waters. you can see the pictures there. that's serious listing from the ship. that was quick. the sinking just happened over a couple of hours. it's not certain at this point what had happened. we were hearing reports from some of those on board the ship. they were saying they all had life jackets on. they were ordered to jump in to the sea. we know the rescue operations

underway. helicopters are in the area. they have other ships in the area as well trying to pick up the people in the water. they say it is ten degrees centigrade so they can survive least one hour in this water. it is springtime and the water is not that warm. they want to get to the people quickly as they can. as far as we know hundreds of these passengers were students. they were high school students. they were on their way to jeju island. >> 450 people sinking off the southwestern coast. as soon as we get more information we will check in. now the latest on the search for flight 370. i want to turn to cnn reporters in the search zone michael hom holmes and joe johns in kuala lumpur. they didn't find any information of note in the data of the bluefin yesterday.

it had to return hours after but are they expecting more from bluefin today. >> it was cut short because the programming basically, software in the bluefin told it if it got to 4500 meters down it had to come back up. that's what it did. they are talking about reprogramming the software to let it go down even deeper. it went about four square kilometers on the first trip, don. remember, on a full 16 hours on the ocean floor to go 15 1/2 square miles. that's 40 square kilometers. on this journey it did four square miles. they took up the data and found nothing of note. it is down there now and has six hours or so on the bottom before it comes back up and they will have another look. so far, nothing, but it is early on in this. one thing they were heartened by, don, is it all seemed to work. the unit itself seemed to perform well, don?

>> given the limitations of searching with the bluefin -- we've discussed many of them -- why can't they put more than one robo sub down there? >> it's a fair question, don. the answer is that there's not that many of these things around. obviously a highly technical piece of equipment. there are others around the world, but they are all in use at the moment. they are in great demand for oil and gas research, like on the bottom of the ocean. they are all at work at the moment. this is the only one that was available. they have their eyes out for others as they become available but this is one they were able to bring in. they brought in it in on a 747 and got it on the ocean shield. that's the other thing, if you pulled in another one to help out, you need another ship equipped to be the mothership. it is complicated thing but a fair question, don. >> now to joe johns in kuala lumpur. the malaysian cabinet agreed to

set up a team to specifically look in to the flight 370 case. joe, what does this investigative committee supposed to do? >> well, it sounds roughly similar to the commissions that the get started in washington when there's a disaster, perhaps like the space shuttle commission, the 9/11 commission, don. it's acceptance of the fact that malaysia has questions that need to be answered in a thoughtful way, i think, about mh-370. they will look at airworthiness, human factors, flight recorders, medical concerns, weather, survival factors. all the things that could explain how a jumbo jet could vanish without a trace with hundreds of people on board, don. >> the malaysian defense minister who's the acting transportation minister raised comments that raised a lot of eyebrows. let's listen to it. >> our ministry of defense was

not attacked like pentagon was. it is a future threat and that needs to be addressed and the sops that is with the air force. might have to be relooked at. >> so, joe, give us the context behind this? what are we to make of his comments? why is he bringing up 9/11? >> those remarks were made at this huge defense services expo here in kuala lumpur. we went over there yesterday. people frr from all over the world, including some u.s. military. his point is malaysia needs to upgrade its capabilities including surveillance and space and underwater. though it sounds like he's says the air defenses here are not great. there are a lot of considerations for malaysia relating to mh-370, john.

>> thank you very much. time for my team of experts, jeff weitz the author of extreme fear, mary schavio, former inspector general for the department of transportation and david soucie author of why planes crash. les a bend. lel low to all of you geoffrey to you in perth. how is the weather change something is it a factor in the search? >> don, not at this stage. the weather out in the search area this is the current search area is varying, showers, occasional showers, visibility five to ten miles, depending on the day. there's the occasional front coming through. at this stage of the season, it's only getting the tip of the

front, a couple of fronts. a few month's time the weather will turn worse. for the time being it's okay for searching for debris. >> geoffrey, yesterday we reported the new zealand search team had taken some debris and some photographs from the search area. those were being analyzed. what more do we know about that? >> don, you are absolutely right. at this stage, we haven't been told we are waiting for another press conference. nothing has been advised as of yet. we are certainly waiting for that analysis. we are waiting for the analysis of the oil that was picked up off of the water about three miles downwind and down sea of where they are searching for the black box. so two tantalizing pieces of evidence, if you like, that we are waiting for some confirmation either way. >> all right. mary schavio here in the united states, do you think the bluefin will ultimately be able to get

the job done, despite the setbacks in its mission so far? >> well, i do, particularly since today we learned they think they can reprogram it and get it to dive at least a little deeper. it can work in a little deeper water. if not, forethor if they need m. we heard there are eight worldwide. so if they need to get more to divide and conquer, get the job done faster and then they can remove to the other kinds of vehicles such as a ramora, alvin or the chinese -- i forget what it is called -- the sea dragon. they have a lot of other things they can call in and i think they will call them in as they feel they have to have them. so, for now it's doing the job. >> jeff wise, the the bluefin did exactly as programmed to do, to come up if it exceeds the

depth limit. what happens if the plane is beyond that depth? don't they design submersibles to go a little further than their capabilities? >> sure. they have a certain margin so it doesn't go right to the margin of capability and implode. it has limits. it can't go infinitely deep and the ocean gets quite a bit deeper than it does at this particular spot. in the event it is much deeper than what it has been operating at today they are going to have to call in other pieces of equipment that can go in deeper. and unfortunately those cease to exist. >> do you think we will see manned subs down there, something like the alvin manned research submarine. >> i think eventually we will when we are in the retrieval phrase. right now we are talking about complementing the search and the only one capable of that has sonar and photography capabilities. that is what i would expect to see next if they don't see

anything with the bluefin. >> les abend, another clue is the oil slick we talked about. you and i were at the press conference when they announced it. two liters were collected and on their way to mainland for testing now. will they be able to determine if the oil is specific to this plane? >>. >> my understanding is absolutely. it is very specific fluid from the engines themselves. there's about 20 quarts in each engine. there's hydraulic fluid. yeah, they should be able to make an easy analysis of what the other ridge nation vessel it is. >> hopefully we get confirmation the oil slick is related to this plane or not. are you concerned we aren't looking in the right place? >> yes, i am. i'm hoping with you that the oil slick will prove to be something worthwhile as well as the other

evidence there's been reported over the last few days. we'll have to wait and see and i will be waiting and seeing. >> all right. stick with me, everyone. when we come back, a legendary ocean mystery. the "titanic" sank exactly 102 years ago today. what did scientists learn in the search for that great ship and how can those lessons be aflied to the search for flight 370? life with crohn's disease or ulcerative colitis is a daily game of "what if's". what if my abdominal pain and cramps come back?

what if the plane gets delayed? what if i can't hide my symptoms? what if? but what if the most important question is the one you're not asking? what if the underlying cause of your symptoms is damaging inflammation? for help getting the answers you need, talk to your doctor and visit crohnsandcolitisinfo.com to get your complimentary q&a book, with information from experts on your condition. when my son was born, i remember, you know, picking him up and holding him against me.

it wasn't just about me anymore. i had to quit. [ male announcer ] along with support, chantix (varenicline) is proven to help people quit smoking. it reduces the urge to smoke. chantix didn't have nicotine in it, and that was important to me. [ male announcer ] some people had changes in behavior, thinking or mood, hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. if you notice any of these, stop chantix and call your doctor right away. tell your doctor about any history of mental health problems, which could get worse while taking chantix. don't take chantix if you've had a serious allergic or skin reaction to it. if you develop these, stop chantix and see your doctor right away, as some could be life threatening. tell your doctor if you have a history of heart or blood vessel problems, or if you develop new or worse symptoms. get medical help right away if you have symptoms of a heart attack or stroke. use caution when driving or operating machinery. common side effects include nausea, trouble sleeping and unusual dreams. i had to quit smoking to keep up with this guy. [ male announcer ] ask your doctor if chantix is right for you.

i had to quit smoking to keep up with this guy. i'm mom at the playground the kids get trail mix, and you get a delicious milo's kitchen chicken meatball. i wish you liked my cooking that much. milo's kitchen. made in the usa with chicken or beef as the number one ingredient. the best treats come from the kitchen. bluefin is scouring the ocean floor right now searching for signs of malaysia airlines flight 370. vehicles like the bluefin are

one of the best tools in a deep sea search and even used in the hunt for the "titanic." here'ser jean casarez. >> if the search teams like a mystery after six weeks of hunting in a vast stretch of ocean, think back to another ill-fated voyage, one that ended 102 years ago. the "titanic" set salt il. park stevenson served as the technical adviser to james cameron, director of the blockbuster movie "titanic." >> really "titanic" was a well-built ship. she was manned by competent crews. they were obeying the rules at the time. >> reporter: four days later, the "titanic" struck an iceberg and its fail was sealed. more than 1500 people perished. for 75 years the sunken luxury

liner remained on the sea floor, and the mystery grew of the "titanic" grew perpetuated by myths and theories. but in 1985, searchers finally realized what the wreckage had eluded them. the report ared location of the sos transmission turned out to be wrong by 13 miles. the wreckage was finally found, split in half, resting over 12,000 feet below the ocean surface. still compared to the search for flight 370, the "titanic" expeditions were at an advantage. >> in this case we don't even have a reported distress position and the ocean is just as deep, or deeper, at "titanic." >> reporter: much about the effort he says is similar including the search often underwater vehicles. >> they use technology that is almost virtually identical to what they are using in the search for the malaysian airliner today. >> reporter: if the wreckage of the plane is found, the next

step is analyzing it. a lesson learned from the "titanic" is not to jump to conclusions. >> there's been a lot of investigations of why "titanic" sank. was it a design flaw, was the steel brittle, weak, they try to point fingers at it. if you look at each thing in isolation you can disprove it. >> reporter: the way to solve the mystery this time, he says, is the same. >> if we can find the wreckage, as we did find the wreckage to "titanic," we can reverse engineer and figure out what happened. as with "titanic," the wreck will have the last word. >> reporter: jean casarez, cnn, new york. >> all right, jean. appreciate that. 102 years later. what happened to the mighty "titanic" still fascinates people around the world. joined by a research oceanographer with the marine physical laboratory at the scripps institution of oceanography, university of california san diego. he was part of the team that found "titanic" at the bottom of

the north atlantic. thank you for joining us. do you think that investigators are going about the search for flight 370 in the right manner? >> thank you for inviting me, don. first of all, yes, i think so. "titanic" did not have a ping er on it that we could listen and be guaranteed within a few miles of the wreck in order to know where it was. and given the fact this is a standard search procedure that the u.s. navy uses for its military planes and things like that, i really can't see any other options. >> so you think they are searching in the right area, jules? >> if they heard the pinger, the answer is yes. i spent a bit of time looking in to the specifications of the manufacturer of the pinger. they say you can hear us within two miles and go to the manufacturer of the towed pinger locater and they say we can hear a ping er within two miles and you realize you are in 2 1/2

miles and telling a pinger locater two and a half miles down, you have to be within a couple of miles in order to locate it. the question is the wreck near the pinger locater? certainly the box is there. so yeah, i think we are within a couple of miles, the 2 1/2 hour transmission they received is seems like good news in terms of trying to locate this thing. >> let's talk about flight 447, a similar air incident. look at two pictures from air france 447. this is a look at the debris field. this is a clear picture of the engine on the ocean floor. can we eventually expect the same type of pictures when 370 is found? >> yeah. so that's a great question. i think one thing that an oceanographer will tell you, like myself, is the ocean could be different anywhere. the global feel ing is that the deep ocean is actually very clear. all the stuff that we see that

comes down somehow is remineralized by the organisms in the ocean and the deep ocean is pretty clear. it would be easy for the teams out there to figure out how clear the ocean is. given that scenario, i think very much so. given the camera systems, we should be able to see optical images like the ones you are seeing now from 447. >> that's my next question. can the bluefin give images similar to those from 447? >> i do believe there's not a big difference between the bluefin and remuss. so given that it has camera and lights on it no reason itten can't. >> let's talk more about the bluefin creating a map of the ocean floor. could wreckage be mistaken for boulders. >> reporter: rolling hills? >> yeah. this is a great question which again challenges our knowledge of the environment. as you probably know from the stories we have been hearing and

learning, we are using an acoustic system. that means we send out a sound and it reflects off the sea floor and we listen to the reflection. by compositing successful reflections we create an image. we know these are rolling hills and that's the best news i have heard all week and the other thing is there is a lot of silt down there. >> why is that the best news you have heard all week? >> because the rolling hills -- you would be worse off if you were in canyons and valleys and if you have all sort of crevices and big boulders around. so rolling hills is not a bad place for a sonar. it is a matter of figure and ground. we want to see the figure from the ground. if it is just rolling hills and if the sediment is absorbing the sound to some extent things on top of it, reflective things like man made components of jets and metal objects should give us spectacular reflections which would allow us to see the difference between the man made

objects and the rolling hills. >> do you think we may see some manned underwater vehicles go down at some point. that would be if, i imagine f the bluefin-21 doesn't locate anything. >> personally, from all that i have known in doing oceanography the worst thing to do would be send a manned vehicle down. from everything we learned. if you look at the gulf of mexico oil spill they were able to fix that with an rov, a remote operational vehicle. we have a lot of experience with sde deploying remote operational vehicles that would have tools on them, that can cut, that can hold wrenches. they can do things and certainly bring black boxes up and work 24/7. if you are in alvin you don't have that much time on the bottom. you are much better off with remote tools in my estimation. >> because there's not enough time in a manned vehicle. >> as i described to carol

costello, when i started to work with ballard, he said there is a long elevator ride, three or four hours on target and long elevator ride back up. the remote vehicles are 24/7. -- maintenance six hours later it does another 24 hours. can't do that in a manned vehicle. >> do you think that they will find 370? >> absolutely. i think so. i really do. i really think they are going to find it. i think we have a good locust for it. i think the sonar pinger was giving us a good search and i can't imagine it won't light up. hopefully in the next week we will find it. >> ultimately the bulk of the "titanic" wreckage was left in the final resting place on the ocean floor. do you think the more time passes more likely the same

choice could be made about 370? >> well, there was a huge commercial interest in bringing the "titanic" back. people dreamed of having amusement parks with "titanic" sitting in it. it is really hard to bring back big things from the bottom of the ocean. i think that a good visual survey over a period of a week or two would give us a lot of information, coupled with the flight recorders to really make some conclusions of what happened. >> jules jaffe. fascinating having you on. >> my pleasure. a top official makes a rather eye-opening statement over who should control the black boxes if they are found. i'll ask my team of experts about it.

ameriprise asked people a simple question: can you keep your lifestyle in retirement? i don't want to think about the alternative. i don't even know how to answer that. i mean, no one knows how long their money is going to last. i try not to worry, but you worry. what happens when your paychecks stop? because everyone has retirement questions. ameriprise created the exclusive confident retirement approach. to get the real answers you need. start building your confident retirement today. oh! the name your price tool! you tell them how much you want to pay, and they help you find a policy that fits your budget. i told you to wear something comfortable! this is a polyester blend!

whoa! uh...little help? i got you! unh! it's so beautiful! man: should we call security? no, this is just getting good. the name your price tool, still only from progressive.

i want you to know stuff i want you to be kind. i want you to be smart. super smart. i want one thing in a doctor. i want you to be handsome. i want you to be awesome. i don't want you to look at the chart before you say hi...david. i want you to return my emails. i want you to keep me doing this for another sixty years. at kaiser permanente, we want you to choose the doctor that's right for you. find your perfect match at kp.org

and thrive. top malaysian government official had this to say today about flight 370's blax black boxes. it matters which cles country takes control but more important to find out the truth. back with me my team of experts. what do you make of the malaysian minister said about the black boxes? do you agree they are arguably the most important part of the investigation? >> there's no doubt they are. the fact that he felt he doesn't matter -- he just wants the truth. to get to the truth, you have to take care to get there. it is indicative of the kind of careless communication we have gotten from the malaysian g

government. if you look at how angus houston is handling the situation there's much different. no opinion, conjecture or conclusions. it's the facts. >> just the facts. geoffrey in perth, officials said the ariel search for debris is winding down. hard to imagine they would conclude the search without finding any debris at all. is that possible? >> it's an interesting comment, actually, don. while they did say -- you are right, they did say it would wind down over the next few days, but they designated a new area they were revisiting which they last looked at the end of march. they have new drift and current information, new analysis and that's where they are now searching, which is some 600 miles southwest of where they had been looking for debris. so it's basically due west of

perth. it's about 1,500 miles southwest of perth. no planes in the air today. >> are you concerned the visual search may be ending too soon? >> yeah. it seems to me that it's getting expensive. yeah, i'm concerned about that. we all have experience with the fact that anytime we have an impact or accident of this nature in the ocean that we have some sort of debris as a everybody pretty much knows. but, you know, from a military expert in accident investigation he said don't be surprised to be surprised. so -- >> mary, the malaysian cabinet agreed to set up an international investigation to look in to anything that may have played a role in the disappearance like airworthiness, human factors. is this true without black boxes or a step in the right direction

do you believe? >> oh, no. this is something they should be and must be doing, particularly under the treaties and the rules and regulations that set forth accident investigations. the ntsb does this and sets up many committees. each dealing with a separate aspect of investigation. each does part of the investigation and issues a report and recommendations. those are very important. if they don't have a committee addressing a certain area there's no hope of getting sop findings and recommendations for improvements in the future. so this is what they need to be doing and what they have to be doing and at least this way they are ready to address the evidence when the evidence is out. >> how much faith will you have -- and i would imagine other investigators like you, on your level, when you have an inquiry headed by the malaysians at this point? >> it all depends on how transparent it is. if they have participants -- for example, the committee that will

look at the black box information, they have already said they can't do it. so that leaves four nations that can. they probably will have all four help, australia, u.k., france and the united states. so if it is a transparent investigation and truly -- what they call the open-party system meaning boeing, malaysian air is a party and the government helps in the search for the black boxes will be parties. as long as it is transparent and open you can have some trust in the system. you know, that's what will be the key to having people believe it and having it have a useful product, something that we can truly use to improve aviation security and safety. >> jeff wise, we are learning the faa announced that all planes will have gps tracking eck technology by 2020. sounds like a big headline. would it have prevented anything for flight 370? >> so this new air traffic

control system of next gen, the key technology behind it is adsb. as you pointed out it involves planes carrying gps equipment. they are determining their position by satellite and then through ground-based radio transmitters are able to communicate that informationing to air traffic controllers. it's a very sophisticated advanced system. it will go a long way toward improving air safety in the united states. would it have changed the situation with mh-370. why? because mh-370 already had it on board. in fact, if you had gone to a -- one of these airline tracking websites in the aftermath of the incident you would have been able to see where mh-370 went before that fated turn to the west. the system was turned off. as it is currently, this system

could not have prevented mh-370's fate. it was turned off. maybe they will make it so it can't be turned off but it was in place already. >> it will be hard to figure it out without the pilot and co-pilot, figuring out what happened to them. are we any closer? >> i don't think so. as a matter of fact, there is even more fog in the air. as we get bits and pieces of information about what the malaysians are releasing to us that they know or think they know about what the pilot conduct was all about. so no. >> when we come back, my panel of experts will answer your questions. [ male announcer ] this is karen and jeremiah. they don't know it yet, but they're gonna fall in love, get married, have a couple of kids, [ children laughing ] move to the country, and live a long, happy life together where they almost never fight about money. [ dog barks ] because right after they get married, they'll find some financial folks who will talk to them about preparing early for retirement

and be able to focus on other things, like each other, which isn't rocket science. it's just common sense. from td ameritrade.

my team of experts are back answering your tweets. les, look at this tweet. it says the question should not be what new technology to track planes but what procedures to be enforced when tracking is turned off. this goes to what geoff wise was talking about. >> it is tracking system emanated from the plane to a satellite and it sends it to a ground station and radar system which is what next gen is. i'm simplifying it. the reason the adsb -- it was

functional, i agree with geoff on that. the reason it didn't perform is because you have to have a participating air traffic control in the system. i don't believe they participated. as far as turning it off, it's not the transponder that turns it off, but a function on the 777 of the flight management computer and then it can be turned off. next gen is going to the united states because we are participating in next gen. with other countries. europe is participating. other countries are and i'm not familiar with the far east. that's why the system failed with malaysia 370. >> david soucie. >> i was on the team that wrote the funding document that goes to congress for next gen. if you want to go to know more about next gen you need to talk to me. it is sending a signal out, which is -- unless i'm not going after you hear, i'm talking

about what geoff was saying. because les is on key with this. it is sending the signal out, i would agree. it would have nothing to do and that is what the aircraft was equipped to. ittal sends to every other aircraft in the system. when an aircraft turns it off, even if the switch is off, every other aircraft who may have interaction with that aircraft would get a signal and say somebody turned it off. that's the weak leak in the system. it is designed in the system and yes, it may not have prestrented the accident. i agree with that. but i will tell you what, everybody would have known where that plane went. >> jeff wise, you want to respond? >> well, i divert to david if he disagrees with what i say. i defer to him. i would clarify the satellite use of the system is to determine the location of the plane which is then transmitted in the current incarnation via

ground-based radar, radio transmitters. so that's why, once the plane was more than 150 miles off the coast you start to get that lapse in coverage. >> that's not next gen. okay. je geoffrey thomas, appreciate the clarification. what has become of the high-tech british nuke sub reported to be in the area. mr. thomas? >> that's a great question, don. absolutely brilliant question. to which i have no answer. i've asked many times here, on the record, off the record and i'm simply told you will never know. it's top secret. so you know one has to assume that it is playing a very important role in this search. exactly what that capability is, apparently we're not going to be told. >> all right. stick with me, everybody. when we come back, a closer look

at one thing that has been revealed by the search. all of the trash floating around in the world's oceans and the negative impact it may have. honestly, i'm pouring everything i have into this place. that's why i got a new windows 2 in 1. it has exactly what i need for half of what i thought i'd pay. and i don't need to be online for it to work. it runs office, so i can do schedules and budgets and even menu changes. but it's fun, too -- with touch, and tons of great apps for stuff like music,

'cause a good playlist is good for business. i need the boss's signature for this. i'm the boss. ♪ honestly ♪ i wanna see you be brave their type 2 diabetes... ...with non-insulin victoza. for a while, i took a pill to lower my blood sugar, but it didn't get me to my goal. so i asked my doctor about victoza. he said victoza works differently than pills, and comes in a pen. and the needle is thin. victoza is an injectable prescription medicine that may improve blood sugar in adults with type 2 diabetes when used with diet and exercise. it is not recommended as the first medication to treat diabetes and should not be used in people with type 1 diabetes or diabetic ketoacidosis. victoza has not been studied with mealtime insulin.

victoza is not insulin. do not take victoza if you have a personal or family history of medullary thyroid cancer, multiple endocrine neoplasia syndrome type 2, or if you are allergic to victoza or any of its ingredients. symptoms of a serious allergic reaction may include swelling of face, lips, tongue or throat, fainting or dizziness, very rapid heartbeat, problems breathing or swallowing, severe rash or itching. tell your doctor if you get a lump or swelling in your neck. serious side effects may happen in people who take victoza including inflammation of the pancreas (pancreatitis) which may be fatal. stop taking victoza and call your doctor right away if you have signs of pancreatitis, such as severe pain that will not go away in your abdomen or from your abdomen to your back, with or without vomiting. tell your doctor about all the medicines you take and if you have any medical conditions. taking victoza with a sulfonylurea or insulin may cause low blood sugar. the most common side effects are nausea, diarrhea, and headache. some side effects can lead to dehydration,

which may cause kidney problems. if your pill isn't giving you the control you need... ask your doctor about non-insulin victoza. it's covered by most health plans.

the search for flight 370 has put a spotlight on all of the garbage floating in the world's oceans. while that trash has impacted the search with initially promising leads turning in to disappointing dead ends it may have more significance consequences. the story from cnn's stephanie elam. >> our oceans are littered in trash. it's unfortunate it has taken this human tragedy to highlight it. >> reporter: as search teams scour the ocean for debris from flight 370 the world is getting a look at the trash conditions of our oceans. several times, objects floating in the water thought to be from the missing 777 jet turned out to be junk. >> these are the example s of the pollution we find in the oceans. >> reporter: anna cummins is the director for an institute that aims to end plastic pollution in the oceans. >> roughly 80 to 90% of the debris in the oceans is plastic. people don't realize this is not just unsightly.

it is actually getting in to the food chain and maybe affecting our health. >> it is affecting animals. >> absolutely. 660 species today and that's a conservative estimate are affected by plastic. they get tangled in it or ingest it. it is everyday items, bottles, bags, forks, single use disposables and packaging. and it doesn't disappear. it acts as a sponge for contaminants. >> reporter: noaa says patches of garbage between florida and hawaii. there are international laws that prohibit dumping plastics in the ocean. the problem is enforcement. countries need to do a better job cracking down on pollution and another issue, the ocean waters are difficult to police. >> what we have seen in the last five years is an explosion in awareness. >> all over the world people are arealizing we cannot aforce single use plastics and

companies need to take responsibility for their products after it leaves their hands. >> what impact will it have on the ocean? ? if it broke up that debris field on the bottom of the sea floor would be massive. >> you are right. the wreckage field could be spread over an extremely large distance. >> reporter: yet as ocean pollution goes the affect would be minimal. >> the debris from the missing plane is a drop in the bucket. 80% of the plastic pollution we find in our oceans starts on land. simple as the debris in the sand. the oceans are vast. so this single tragedy with the missing airplane is not going to make a dment ocean pollution. >> reporter: perhaps the sight of the junk will make people think before they throw it away. stephanie elam, cnn, santa monica, california. >> thank you for that report, stephanie. i'm joining by an

oceanographer at the university of new south wales in australia joining us via skype tonight. you are an expert in this part of the indian ocean. have you been surprised by the amount of ocean debris found, versus a lack of debris found from the plane? >> no, not at all. we have known a long time that especially the recent search area, the new search area they are looking at now there's a lot of debris there because it is close to what we call the garbage patch and that's where all of the garbage accumulates. there are five in each basin and one in the indian ocean. everything that has been thrown in the ocean, the last 50 years in the last 50 years and still floating is somewhere in this garbage patch. >> how do those patches form and is it possible at all to clean them up? >> they form essentially because the water, the movement of the water is not two dimensional. the water doesn't stay at the

surface. it is like a roller coaster ride. places where it sinks and places where it upwells. the plastic is too buoyant and keeps floating. as the water sinks, the plastic stays behind. in the meantime, more and more plastic is carried in to the regions by new water that sinks them. it's like this internal move with plastic more and more accumulating. about whether it is possible to clean it up, i'm skeptical about that. for three reasons. first of all, what we now see is how hard it is to work on the ocean. how hard it is to get ships out there, how big the ocean is. how much energy it takes. i don't think it is worth it in terms of energy. secondly, most of the plastic that does most harm, as was said in the report just before, is small plastic. this is plastic that gets in to

the food chain and fish. if puppet to sieve out the small plastic you are going to inevitably sieve out the fish and plankton and end up with a dead ocean. thirdly and most importantly is a lot of people have the wrong idea of what the garbage patches are. they think they are islands of plastic. that's not true at all. even the highest amount of plastic that we see, that we measured is maybe one piece of plastic every ten feet or so. so even though there's a lot of plastic it is very sparse. it is very much extended over huge areas, thousands of miles. >> so the best way to stop it is to on the surface to be aware of it and stop dumping stuff in the ocean if we can avoid it. what about below the surface n the area they are searching, what types of debris can be found on the ocean floor, erik? >> to be honest, we don't know.

just like we don't know where this plane is, we don't know enough about the ocean floor and what kind of debris is there. there's only one study that came out last year out of montreal bay aquarium on the west coast which was a really good study. they went back to the footage from the underwater auv and looked at the footage and tried to see how much there was with. and staggering amount of plastic. much more than anyone anticipated. plastic bags, tires even whole refrigerators on the bottom of the ocean. this is close to the continental shelf. close to monterey bay itself. once you get to the open ocean there's no data on how much plastic there is in the ocean floor. >> erik, please stand by. when we come back the final thoughts from my experts. mine was earned in korea in 1953.

afghanistan, in 2009. orbiting the moon in 1971. [ male announcer ] once it's earned, usaa auto insurance is often handed down from generation to generation. because it offers a superior level of protection. and because usaa's commitment to serve current and former military members and their families is without equal. begin your legacy. get an auto insurance quote. usaa. we know what it means to serve. [ female announcer ] f provokes lust. ♪ it elicits pride... incites envy... ♪ ...and unleashes wrath. ♪ temptation comes in many heart-pounding forms. but only one letter. "f". the performance marque from lexus. but only one letter. my guests are "nathan, which dish is better?".

now i say you can have it all with our new seafood trios! red lobster's new seafood trios is three times delicious! choose one option from the wood-fire grill, one signature shrimp dish, and a pasta like new lobster mac and cheese. three choices all on one plate. just $15.99. for a limited time only! you can build it any way that you like, pick your three favorite things. it is spectacular! i'm nathan tavernaris and i sea food differently.

my panel of experts back with their final thoughts. here's my question, what do you believe will yield more useful informationing, the black box, plane's debris or the criminal investigation by the malaysians? first you, mary? >> flight data recorder. that's the number one thing. >> les abend?

>> agree with mary. at this point the flight data recorder. >> tim tillman. >> i hope there is something there. >> i hate to be boring but i side with everybody else. i think the mystery is there in the black box. >> what happened david soucie. >> let's make it unanimous. >> it's unanimous. i didn't even have to rush you guys or not speak to one of you. you all believe that all of the clues will come from the black boxes, everything that we need to know from those black boxes and not necessarily from the wreckage or from investigating the pilots? >> right. >> if i can jump in here, we hope the answers will be there. we don't know. definite ly it will be interesting to see the wreckage. whatever answers aren't in the black box, investigators will have to look at that wreckage, pull it off off the seabed, if necessary, to look at the key components and see how they are affected by the crash. >> thank you, everyone.

remember, the bluefin-21 comes up tomorrow. they are hoping to get that information back from the bluefin. let's hope it is working properly this time so it can stay down the entire 12 hours. that's it for us tonight. i'm don lemon. "ac 360" starts right now. good evening, i'll bill weir. >> breaking news a sonar sub in the water water and the search is back on track. tonight you will see what a bluefin-21 can see down there in the side-scanning sonar. also breaking what appears to be the largest, most dangerous gathering of al qaeda in years fe question did the pentagon know about it or not and dr. sanjay gupta is fighting to stop the ebola crisis. some medical personnel have lost their lives in the battle. we have the latest from