will decide. check "bleacher report" for updates and analysis as well as our coverage at cnn. saying good-bye from augusta national, i'm rachel nichols. "newsroom" is next. it is 3:00 p.m. on the east coast, noon out west for those joining us welcome to the "cnn newsroom." i'm fredricka whitfield. starting with the latest in the search for missing flight 370. the australian prime minister said he is confident search crews have detected one of the plane's black boxes. and it all goes back to the four critical pings that have been picked up over the past week. >> they've been numerous, numerous transmissions recorded, which gives us the high degree of confidence that this is the black box from the missing flight. >> but will search teams be able

to find the senate again? the prime minister said it's fading rapidly, and that could indicate the battery's powering the pinger are already dying or may already be dead. the pings were first heard last saturday and then again on tuesday, but nothing has been heard since. on saturday, four team ships and ten planes involved in the search more nan 1,000 miles off the coast of australia focusing in on an area about the size of massachusetts and connecticut combined. let's start in perth, australia for the latest on the search. matthew chance is there. what is the focus of the search right now and how is that expected to change, perhaps, in the coming days? >> well, the focus of the search, fredricka is that area of 16,000 square miles. about 1,000 miles off the coast of western australia, where t the -- the various ships that are engaged in this search are carrying at their measurements

and their sensing techniques underneath the area and also a separate air search area, aircraft flying through the skies monitoring closely the surface of the ocean to see whether they can find debris of the missing airliner. you see that every day, almost. the search area has been getting smaller and smaller, and it's important to point out that's not because of any data they've received, any new data that's been received. it's simply because they've established these four separate acoustic events, four separate ping detections over the course of the past week. the last one was four days around and used that to triangulate this very rough area of the indian roeocean, where t think the most likely places where the airliner went down and you going through a methically by bit, bit by bit, to locate any sign of all of wreckage, locate the black box flight recorders from the malaysian aircraft are and so far have come up with nothing.

as i just mentioned, in fact, it's been four days now since they recorded and detected any pings from the emergency beacons on those black box flight recorders. so i think there's a sense in which, you know, hope is diminishi diminishi diminishing somewhat, fredricka. >> what about the planes up in the air? how are they assists in the search? >> reporter: it's a kind of separate search, although there are some planes involved in the acoustic search as well dropping sonar buoys into the water to try to detect pings as well. the majority of the aircraft involved in the multi-national search are engaged in a slightly different area to where the sonic search is underway. that's because they're using current modeling to see where if the plane had crashed into that patch of the ocean, where the debris from it would end up, taken away by current, winds, things like that. they're in a slightly different area. more to the west of the sonic search zone.

sonar search zone. and so far, you know, they're flying a lot. they're flying 11-hour shifts. basically it takes three or four hours to get there, three or four to get back and fly around the rest of the time. 11 or 12 hours. a very long flight. so far they haven't found anything they find to be linked to that missing malaysian airliner, fredricka. >> thang mu chance, thank you so much in perth. with australians expressing confidence they've narrowed the search area, where do we go from here? to our panel. aviation analyst mary schiavo, a are toer inspector general for the u.s. department of transportation now an aviation attorney representing families suing airlines in crashes and disasters. rob mccu cnn analysts and captain van gurley, is a retired navy oceanographer and a senior manager at metron scientific solutions. good to see you all. the pinging signals seem to be

it's been several days, four fading. days since we've heard anything or at least officials heard anything. what is that telling us about prap perhaps the location of these pingers or could it be buried in silt? i wonder, would be, if you could address this? or is this as simple as the battery is dying? >> i think it's as simple as saying that the batteries are starting to fade away now. they don't just cut off at a certain day. they gradually lose power and get weaker and weaker. i don't think the black boxes will be covered in silt. situated as they are on this broader slope. so, you know, we're getting to the time where we're going to lose pinger signal, and it's time to go and look in the water with sonar. >> so is that your opinion as well, captain? that before the pinger has really ended, for certain, is now the time to go ahead and bring in other, you know, submersibles? other devices that might be able to detect any kind of activity

from these pingers before they absolutely go dead? >> well, i agree with rob that i think we may be reading a little bit too much into the lack of signals since tuesday. the fact that we had very strong contact on saturday over two hours held, and then reacquired the signal on tuesday i think is the key point. at this point, the batteries are, have either died or are about to die based on how the manufacturer rates their life span. in the next step it will be to start the ocean bottom search, but that doesn't need to be rushed into and the australians have been slow and deliberate to give every chance to hear one more ping. if it's still there, before they start the next phase, because those are mutually exclusive events. once you start looking on the ocean bottom with the bluefin you won't hear more pings because of the noise of that evolution. >> mary, can you introduce this bluefin too late into the game? do you need a little a little battery life in those pingers for it to be most effective, 0

is that really irrelevant here? >> yeah. for the bluefin, they won't need or couldn't use pingers anyway. they are looking for, literally looking on the ocean floor with sonar. they're taking ultrasound, if you will, of the floor of the ocean, looking for things that don't belong on the ocean floor. like black boxes and wreckage. i think the thing with the battery is more important for the australians to be able to say, look, we gave everything the best shot, and we wrang every last wit out of the batteries and they have nothing to do with the pingers. >> the sound is so sensitive. this bluefin, rob. once you put the bluefin in the water you can't have any other apparatus that is in motion or being made out useful. does that include putting the

ships or whatever vessels you have at sea there, do they have to go quiet, engines off? how does this work? >> no. you can deploy several assets at the same time. yeah. and particularly if you're covering a wide search area, where the assets are not working close together. so, you know, you just appropriate on different frequencies. it's a questioner we we want to use auvs and see those deployed, getting fine scale imagery over a smaller area oh deploy deep towed sonar producing less resolution but covers most areas. >> what's most advantageous in this kind of setting? >> well, anytime you're scanning the -- the seafloor with sonar, it's a trade-off between resolution and range. the wider the area you cover, the less resolution, or the less quality, you get, if you like, to the imagery.

if you want to hone the beam right in tight, you don't cover as much area but you get very, very good images. and so at the moment, i think there's a call for more wide ranging sonar so that we cover as much seafloor as possible. >> all right. rob mccollum, thanks. captain van gurley and mary schiavo. thanks so much. we'll talk later on in this hour as well. all right, so much more to this very challenging search in the southern indian ocean. we'll explore that, next.

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the search field for malaysia airlines flight 370 has been 2345ir7 ohh been narrowed over the past few weeks. there's a massive challenge. here now is ed lavandera.

>> reporter: prulunging into th association a mysterious abyss. a journey few humans can comprehend. the boeing 777 is about 200 feet white, 242 feet long and possibly so deep under the indian ocean that you'd pass the statue of liberty, the eiffel tower and the tallest building in dubai on the way down and still be only a fraction of the way to where the plane wreckage might be resting. keep plunging and you've entered a place sunlight can't reach. the pinger locator is well below that. marine biologist paula carlson said at these depths marine life is unlike anyone has ever seen. >> the deeper you go you find less and less. very cold tolerant. might not even have eyes. may be blind because they don't need to see. there's no light down there. >> reporter: keep going towards the ocean floor, at 12,500 below

sea level, the "titanic." where it still rests today. turned upside down and 14,400 is where you hit the iconic peak of washington state's mt. rainier. only after all that would you reach the spot search teams believe the pings are coming from. 14,800 feet into the abyss. if that doesn't capture the magnitude of this search, imagine what one oceanographer described to ed for us. picture yourself standing on top of one of the highest peak ps of the rocky mountains looking all the way down and trying to find a suitcase, in the dark. >> uh-oh. not good. >> got a lot of failures. a problem. >> reporter: only a handful of problem have traveled to these staggering depths or even beyond. one is movie director james cameron using a state-of-the-art vessel, he dropped 35,000 feet or about seven miles to the deepest place on earth.

he's turning the scientific mission into a movie. >> it's that need to see what's there beyond the edge of your lights. to see the unknown for yourself. >> reporter: the pressure at nearly 15,000 feet is crushing and very few manned submarines can with it stand it. >> only a half a dozen subs that can go to basically half the ocean depth with a number of countries having that capability. it gets to the point of, of collapse. it basically implodes. it just crushes. >> reporter: finding the plane is daunting. bringing it back from the deep, even more difficult. ed lavandera, cnn. >> difficult may be an understatement. especially when the ballotries powering the pingers on the black boxes run out. i want to discuss that with former ntsb vice chairman bob francis. so, bob, good to see you. explain these challenges that lay ahead when this pinger --

unless it has already -- dies? >> i think that they're just going to have to get the vessels that are capable of getting down there, and spend, and i believe it's going to be a lot of time, because there aren't that many resources. fortunately, the pingers having come on gives a better idea of where this -- these things should be, but it's going to be a long, long time, and i think people, everyone's going to have to get used to that. >> and when you talk about these pingers, at least the four pingers that were heard in the last week, and the distance between them being about 17 miles, is there a way without that sound, without hearing them to be able to kind of pinpoint where the focal point of those sounds could have been? >> i think if they don't have the data now, probably the answer to that is, no.

on the other hand, there are a lot of really smart people that have been working on this, and somebody may come up with a way to -- to further identify exactly where it is, but i think it's going to be as it was with air france, and we don't have anywhere near the advantage with this that we had with air france. i think it's going to be a long, long trek. >> huh. are you encouraged by anything that you hear in the realm of the submersibles, auvs, all that is potentially being made available for this search that perhaps those means are the only ways in which to find any wreckage, if indeed, it is under water? >> i think it's terrific what people have volunteered, basically the state-of-the-art worldwide has been volunteered and is going to be used. the question is whether this is sufficient to do it very quickly, and i would doubt that.

>> and, yes, investigators say they've heard the pingers, but i still say and use the word "if." if that plane is under water. is there any doubt in your mind that this plane is submerged? is there still a possibility in your mind that instead it may have hit land somewhere? >> there's no doubt in my mind. >> no doubt in your mind that it's under water? >> yes. >> and how long are you seeing this journey? right now there are so many countries that have dedicated its assets. are they in it for the long haul? all of them, for months if not years? >> i think that -- hopefully they're in it for years, and i think one of the other things you're going to see is that people are going to be focusing resources on research in these areas, and that there may be some significant leaps forward in terms of using the

information that they currently have with perhaps some more sophisticated assistance. >> and your form are agency, the ntsb, apparently is, would go with malaysian authorities at this juncture. to what degree do you believe that relationship is being built, and -- are you encouraged to know that the ntsb reportedly is involved? >> i am absolutely encouraged that the ntsb is involved. i have been somewhat outspoken about my, the fact that i've been less than impressed with the malaysian, particularly, initially, management of the investigation. so i hope that -- that they now and they apparently are now, taking advantage of the resources that are not available to them, but are available to a lot of other people. >> bob francis. thanks so much for your expertise. appreciate it. >> you're welcome.

all right. straight ahead, who is paying for this massive search? first, violence escalates in eastern ukraine. all that, next. wow, this hotel is amazing. oh no. who are you? who are you? wrong answer. wait, daddy, this is blair, he booked this room with priceline express deals and saved a ton. yeah, i didn't have to bid i got everything i wanted. oh good i always do. oh good he seemed nice. express deals. priceline savings without the bidding. without standard leather. you are feeling exhilarated with front-wheel drive. you are feeling powerful with a 4-cylinder engine. [ male announcer ] open your eyes... to the 6-cylinder, 8-speed lexus gs. with more standard horsepower

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we'll get back to the mystery of the malaysian flight in a minute. first other news. here's nick valencia. >> good to see you. escalating tension in ukraine. now. >> reporter: -- new reports of action against police. 20 gunmen in camouflage took control of a police building. police inside were allowed to leave but three of them were reportedly slightly injured. the interior minister said te is an act of aggression by russia and called an emergency meeting. the u.s. state department

describes the situation as "worrisome." northern california. new developments in the deadly bus crash outside of sacramento. an affiliate spoke with witnesses who say the fedex truck was on fire before it rammed into the bus'sthe bus was carrying students on their way to humboldt university to visit the campus. ten killed. five high school students. more than 30 injured. pope francis making news. making his strongest condemnation yet of the sexual abuse by catholic clergy. friday he asked for forgiveness and is pledging to impose penalties, on what he called "men of the church who harm children." the pontiff fell compelled to personally take on you a the evil which some popes do. it rests a shift from previous statements on sexual abuse that some felt did not go far enough. in this case, interesting one, fred. a 9-month-old, yeah, 9 months old, in pakistan, in connection with a murder case, no longer

wanted by police. good flus for him. began in february when members of the baby's family threw bricks at authorities who came to collect on a gas bill. several officers injured. no word on how and why the baby was inpla kamplicated. i don't's know if it's impressive or weird a 9-month-old was implicated in an attempted murder case. bizarre. >> i'll go with the latter. many would agree. thanks so much, nick. >> you bet. when stephen kobe take colb to the "late show with letterman" he'll leave that thinking behind. it's not all laughter from critics. here's cnn alexandra field. >> i've got to tell you, i do not envy whoever they try to put in that chair. >> reporter: stephen colbert is he ready to take the microphone from david letterman jb the 2015 transition marking the end of a

late show era. >> paul and i will be wrapping things up and taking a hike. >> reporter: but colbert's new beginning will also mark another kind of ending. he plans to retire stephen colbert the character. the conservative pundit he place on comedy central the "the coal bae report." >> there is no bigger fan of bill o'reilly than bill himself. but -- i am a close second. ♪ >> reporter: the routine has won him plenty of fans and, yes, critics, including real-life conservative rush limbaugh. >> cbs is just declared war on the heartland of america. they've hired a partisan so-called comedian. to run a comedy show. >> colbert has been mocking conservatives a decade. i'm not surprised rush limbaugh isn't happy with the choice nor do i think he'll tune in and watch colbert. a lot of others will. >> reporter: that is what cbs is counting on. but who is the real stephen

colbert? we caught rare moments of colbert playing in straight in 2010 called to testify by a house subcommittee. >> migrant workers suffer and have no rights. >> reporter: his heartfelt records stemming from some made for tv moments in a recurring segment on his show colbert spent a day in the life of a migrant working parking corn and picking beans. >> and what's different about it? >> reporter: colbert was thrown into the national spotlight when cast as a correspondent on the daly show with jon stewart. >> so -- the exciting news today is, i no longer need a cable subscription for the privilege of watching colbert. >> reporter: will late show viewers like the real colbert, as much as the character he's played so well for so long? as dave letterman gets ready to hands over the reins he's already speaking out publicly in support of colbert saying he was flattered by cbs's choice for his successor and calls colbert

a real friend. alexandra field, cnn, new york. >> the light eer side. when we come back, the mystery surrounding malaysia flight 370. who is paying for this massive search and how long will these countries continue to pick up the tab? we'll be right back. [ male announcer ] nearly 7 million clients. how did edward jones get so big? let me just put this away. ♪ could you teach our kids that trick? [ male announcer ] by not acting that way. it's how edward jones makes sense of investing. add vanishing deductible from nationwide insurance and get $100 off for every year of safe driving. we put members first. join the nation. ♪ nationwide is on your side a seven day cruise to alaska or the caribbean from just $549. that's seven days to either marvel at mayan ruins...

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all right. it's now been 37 days since malaysia airlines flight 370 vanished and the mystery that's unfold since day one is astounding. all the twists and turns in the search, leading search crews to the middle of the indian ocean where they detected four signa s s over the past week consistent with pings submitted by a plane's data recorder. earlier the australian prime minister says he is confident the pings are from one of the missing flight's blacks boxes and now crews are trying to zero in on where the cockpit black box or voice recorders might be. the flight for 370, the most difficult in human history and while the search area has been refined, quite a big deal, it's still a massive effort involving several countries and cutty edge

dwhamt has equipment that has to be paid for somehow. here's joe johns. >> reporter: the search for mh-370 is quickly becomes the most expensive of its dmikind i history. the scope, unprecedented says a are toer leader of the national transportation safety board. >> in the had istry of aviation, we've never had a challenge that even comes close to this. >> reporter: more than two dozen countries, seven contributing the most and australia taking the lead. 80 ships and 61 aircraft, all part of the effort to locate the plane. the greatest challenge, the remote distances of the search. >> a tremendous percentage of the resources, whether it's aircraft or ships or personnel, are spending their time getting there and getting home. >> reporter: that comes with a hefty price tag, with some estimates suggesting a cost of $21 million a month's most of the money coming from military training budgets. some some humanitarian organizations and now from u.s. navy operations. for example, a navy p8 aircraft

cost about how much to fly. already spents 3ds 1 million on planes and underwater surveillance equipment. how does this compare to other aviation disasters? the two-year search for air france 447 cost roughly $50 million. the twa 800 investigation and recovery cost about $40 million. in 1996, one of the longest investigations, the ntsb ever conducted. swiss air, 111, went down off the coast of nova scotia in '98, search and recovery took four years and cost $39 million. what of the collateral cost of missteps and management of the investigation? >> frankly, the malaysian government has not handled this at all well. and that's clearly cost time and

resources. >> reporter: the many governments engaged in the search already own these assets, including ships and planes. one way to look at this, at least, as an extended high-stakes training exercise. joe johns, cnn, kuala lumpur, malaysia. >> how will cost factor into the next stage of the search for flight 370? bring back our panel. mary schiavo, rob mccollum, captain bob gurley and bob francis, welcome back. there is reportedly a massive insurance policy on the malaysian airlines as well. we understand somewhere in the realm of about $1 billion. and in what way will this money be used, perhaps, mary, to help reimburse some of these dozens of countries that have invested hundreds of thousands, if not millions? >> well, technically there are several different policies on the aircraft. there's a liability policy, usually about $1 billion, to cover the losses of the

passengers, both people in the air and, of course, not just the passengers, if there's any damage on the ground, and, of course, there was also the coverage on the plane itself. their hull insurance as i understand it. that may have already been paid and that was probably about $260 million to $300 million. on the liability insurance, there's been cases in the cast, a couple indonesian crashes, persons involved in the search and recovery, or search at first attempted rescue actually sued or went after the carrier and the carrier's insurance to help them pay for some of that. i don't anticipate the united states or australian doing that here, but it's been done in the past. >> rob, how can countries like especially australia say, we are in it for the long haul? i mean, clearly, the tab just keeps going up. how can australia continue to afford this, given its the lead country and dozens of countries that are committed? >> well, i think at the moment

everyone's focusing on solving this mystery, and so the cost equation is not at the forefront. but there will be a face shift over the next few days as we go from sending a dozen aircraft into the air each day, you know, bringing the search down to one or two or three ships towing sonar equipment. >> and, bob does that sound reasonable? that the cost equation can not be at the forefront? doesn't it seem the cost equation dictates how far an investigation will go? >> i don't think that -- i think you've got to be careful about the cost, and i'm sure a lot of people have pointed out that a great percentage of these resources that are being used are military resources. and they're learning not only are they training people, they're learning new ways to approach naval discovery. so -- there's certainly -- there

certainly should be and will be an effort to keep the costs down, but i don't hopefully -- hopefully that will not get in the way of getting the investigation done as quickly as it can be. and finding the recorders. >> so, captain gurley, are you in agreement with that? that especially as it pertains to military assets involved, that while much of what they are doing is training, and now they're in realtime exercises at this kind of, you know, it's coupled, this search also becomes part of crystallizing, you know, their training? >> well, there's always costs involved with stuff and in these operations not only the cost of operating the aircraft are and ships, it's the things they're not doing. the other missions delayed now. at this point everybody is focused in getting to the answers of this mystery and to finality for the families. those questions will be held to the side until we can answer the basic questions here of where is

that aircraft? >> and then does it seem that malaysia, while the origin of this investigation is in malaysia, seems so far they're having to foot, you know, the smallest portion of the bill? is that right, mary? >> well, it seems that way. although they would have us believe that they are now reopening the investigation into 239 persons, and also they do have a lot to look at in terms of what happened with the radar. what's going on between the civilian and military radar and all that. so they do have a lot of work to do, if they're doing it. so it's not that they haven't, you know, haven't been able to contribute anything, but you know, when all is said and done, the whole cost of this operation is going to be important and extremely fortunate for one other thing. and it is the total cost of this operation is going to be important when we do the cost benefit analysis, which we must do under u.s. law, to determine whether or not we will require airlines to have black boxes that download in flight.

the glass boxes. then the greater the cost, the more likely we'll get legislative and regulatory change. we should keep track of these bills. they could come in handy for forcing change. >> thank you all. appreciate it. more on the investigation into the search for this missing plane, but next, if you've ever sent an e-mail or used a cell phone, you could be a victim of the internet bug called heartbleed. what to do to protect yourself. next. you get to a fire scene and the firefighters are there to put out the fire. the salvation army and red cross assist the people once the fire is out, but there just wasn't anyone there to help the other part of the family. i would see how upset the people were about their animals. you know, where is my pet?

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all right. a very important programming note. be sure to join dr. sanjay gupta next hour, a special report live from west africa at 4:30 eastern time with the latest on the ledty outbreak of the ebola virus. and speaking of viruses, websites are racing to patch the heartbleed bug. it's described as the worst security hole the internet has ever seen. the bug exposes all kinds of your data without leaving any trace of the crime. here's our tech correspondent laurie segall. ♪ >> your bank account information, e-mails, passports. some of the most sensitive information you store on the internet. you trust these companies to keep your data safe. but security researchers recently learned that information might not have been kept safe at all. a bug in the code that encrypts your personal information on websites may have been broken for two years. giving hackers lots of action to

your personal data. the bus affected 80% of websites including big ones you've heard of. cube ed, amazon, yahoo!. what are we talking about? think going to a website, https. s means secure. how you know you're going to a safe website. the eye-opening thin about this, in the last couple years if you've gone to these sites with the security, it doesn't mean your information has been safe, leading potential hackers ute liesing a tool allowing one computer to access another online called the heartbeat check. with that app the hoertbeat check can force a computer to divulge secret information, including the keys to the encoder. user names, passwords, all that sensitive data is up for grabs. sorry to sas, gets worst. the matter bleed bug leaves no traces. you have no idea when or if you've been hacked. sites are scrambling to get rifd

the bug. might be daying or weeks before the entire web is fixed. what can you do tab? you might have to sit tight because a lot of these websites are still trying to update their code and get rid of this bug, but once they have, you should definitely go in and change your passwords and as always be very cautious about the information you put out there. >> all right. thanks so much, lauri. as we just heard from her, we need to change our passwords. but which ones? get out your pen and paper. you don't need to change every password, because if a company yet hasn't updated its site, any new password created could be compromised as well. you can change passwords for these on the screen. among them, google, youtube, gmail, facebook and yahoo!. flickr and wikipedia. do not worry about amazon, aol, apple, icloud, itunes. these banks, bank of america, capital one, city bank, chase,

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all right, we'll get back to our coverage for the search for flight 370 in a moment, but first many of us don't like what they do and still consume what they produce, the paparazzi. admit it, a celeb caught in a bad moment you just might click on it. well, to get that one second of impropriety can take hours of work for photographers. sunday cnn will go behind their cameras and show just how competitive the cult of celebrity can be. here's the clip of the season premiere of morgan spurlock's "inside man." >> talk to me. what's up? >> khloe kardashian is at stanley's with her mom. >> i'm on my way.

>> just got word from one of his scouts that khloe kardashian is at a restaurant with her mom. so what is the story of khloe and lamar? >> allegedly lamar odom has an addiction and khloe is on the verge of leaving him. whether that's true or not, nobody actually really knows for sure, but inside of every magazine this week there's some story pertaining to khloe kardashian, so it's a big one to get. >> should i try and stay back or should i get out of the car? >> it draws too much attention to yourself, so it's better to just sit in the car. >> i'm looking. i'm looking. >> backdoor. >> backdoor. >> oh, wait. >> let them part, please. please. >> get out the way.

>> all right. another world indeed and that's just one of the worlds that morgan goes inside. from college athletics to cryogenics to cyberspying, watch morgan spurlock "inside man" the season premiere tomorrow 10:00 p.m. eastern time right here on cnn. also happening tomorrow, the premiere of anthony bourdain's "parts unknown" first up anthony goes to india where a train ride up the himalayans improves his grumpy mood. >> truth be told, i'm an angry bitter man when i board. i eat pf chang along the way. so little, the universal tourist. going on a king kong ride. while my stomach growls i become the kind of traveler i warn against, gripy, self-absorbed immune to my surroundings.

but as my brightly little colored trains heads up the hills known as the gateway to the himalayas, my world view starts to improve. the unnaturally bright colors of india start to pleasrably saturate my brain. the views from the window of ridiculously deep valleys, 100-year-old bridges, it's, well, breathtaking. >> wow. indeed it is. catch the view from the top this sunday on "parts unknown" 9:00 p.m. eastern time right here on cnn. all right. at the top of the hour new developments in the hunt for the missing malaysia airliner. why is australia's prime minister so confident that searchers are in the right area? we'll have a live report from perth, australia. co: sometimes you don't know you need a hotel room

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you're were the "cnn newsroom," i'm fredricka whitfield. a message of confidence in the search for missing flight 370, the four signals detected over the past week are a huge step forward according to the

australian prime minister but with the optimism comes caution. >> they've been numerous, numerous transmissions recorded, which gives us the high degree of confidence that this is the black box from the missing flight. i don't want you to underestimate the difficulties of the task still ahead of us trying to locate anything 4 1/2 kilometers beneath the surface of the ocean, about 1,000 kilometers from land is a massive, massive task. >> the search crews are trying to find that signal again before they take the next step. the prime minister said it is fading rapidly. on saturday 14 ships and 10 planes were involved in the search focusing on an area roughly the size of massachusetts and connecticut. we're covering this story from around the world. matthew chance is live for us in perth, australia, and joe