this is an important and encouraging lead. but one which i urge you to continue to treat carefully. >> well, the head of the search operations warns it's not confirmed as you just heard him

reiterate that any of those signals are actually coming from the missing boeing 777's night recorders. on friday a chinese patrol boat reported a signal from very deep in the ocean, it lasted just 90 seconds. experts say it was the same frequency, though, that airline flight recorders emit. they also reported their planes had spotted white objects in the water about 90 kilometers away. that is being investigated as well. let's go now straight to the base of the search prayings of perth, australia. paula newton there was. you were at this news conference about two and a half hours ago, paula. although we get it that they are using caution that this is a lead and nothing verified, you did detect some energy in that room that you haven't seen

before. >> reporter: definitely a a different posture to this investigation in the search, that they underscored the fact we have three separate acoustic signals, two from the chinese ship, one from the "ocean shield," a redesigned search zone and some white objects spotted that ships are attempting to get to to investigate. that's a lot of leads we haven't had for days. angus houston has been in contact with some of those family members and he is being as cautious with them as he is being with us, but at the same time he is saying these leads will be categorically and methodically either verified or discounted and it's so much more than we had just a few hours ago. so definitely the last 24 hours very crucial in this

investigation. natalie? >> yes. and 24 hours ago we were automobiall saying, well, according to what we know about the batteries, this could be it, it could be in the final hours of finding anything. that's really remarkable. you've been talking to some of the families and you interviewed a wife missing her husband. what has been the response of the families lately of the back-and-forth they heard and how might they be handling this? >> you can imagine just what a roller coaster it is. danica weeks, who i spoke to the other day and who i've been in contact with through this entire week, the roller coaster, her last words to me were are they even looking in the right place? now she has least some hope that they are.

danica had a conversation with chief houston just last night, she reached out to him when she heard the news to are reassured and to characterize what this new beacon was about and if it was anything to lead to a new phase of the investigation. he assured her they were being very careful and cautious but at the same time getting all those assets to the new search area to follow up on the acoustic signals. definitely a torturous time when you think every little piece of news they are brought again to the doubt of what the last moments of their loved ones were like. i think that's at the very heart of their interest in the investigation. >> you can tell that angus houston is taking in account what the families are going

if the former managing director of the the national transportation safety board. thank you for being with us. so this is what we know about what the chinese say they've heard. twice, two times, electronic pulse signals, the second time they heard it, it was two kilometers from the original, and it lasted every second they heard something every second for 90 seconds. what do you make of that? >> i think it's very compelling. and particularly that they picked it up a second time. it's not uncommon that both of the black boxes, the voice recorder and the data recorder, you know, are located near each other, so that they picked up a second ping and held it for the for 90 seconds is very compelling. i agree with the air marshall houston that you can not jump to conclusi conclusions, but boy, this is an

encouraging lead, probably the most encouraging lead we've had so far. of. >> and occurring with time running out. >> what will it take for verification? we know the hms echo is on the way. what kind of technology will it bring to help verify this or hear something more. >> my understanding is the chinese vessel had a hand held device, listening device, which is, you know, pretty rudimentary. it can pick up a sound. it's got limited range and limited accuracy. the hms echo has far more sophisticated listening devices. it will be able to, if it picks up the pipng, it will be able t pinpoint its location relatively quickly. i mean, it's still a challenge, but it has the equipment onboard

to lock in where this ping is coming from. >> and what about the challenges of the depth? once there is verification. still we're talking about some 14,000 feet down where this signal could have come, that's 4,500 meters. >> well, the depths of ocean there is certainly a challenge. but 14,000 feet is by certainly, is certainly not unworkable. the remote vehicles, the tethered and the untethered, you know, there's two types. the tethered vehicles can operate at that depth and could retrieve the boxes. i mean, it's challenging but it can be done. and it has been done in the past. >> that is encouraging as well. peter goeld sfr the national

transportation safety board. we appreciate your expertise. and the fact that you feel this is encouraging. and you are an expert, so that will be something that people like to hear. thank you so much. we appreciate it. >> thank you. let's hope it turns out. >> absolutely. thank you so much. we hope to talk to you again once we get more information, once these ships there get to this spot and provide backup to the chinese. the ocean depth, of course, we were just talking about with mr. goelz. the signals were detected nearly 15,000 feet deep. he says there's the technology of this. there's the ocean floor to think about a meteorologist has been look into this and the challenges. >> and he said it's workable. what we're looking at is what can be down at this level making this frequency at 3770 kilohertz. that was chosen because it's not a natural sound you're supposed

to find at ocean depth. of course, there's a possibility. the ocean is one of the areas on our planet we know very little about. >> when you get down to below even 12,000, 13,000 feet. photosynthesis is gone. two or three degrees celsius, just above freezing. we're talking about the life down here, mostly invertbrates. giant squid have been found at those elevations. the frequency certainly has to be worked out. with we know life very much sparse and very unusual making something that sound that low. roughly the state of utah. the broken ridge in place. the eastern side, a plateau. let me go down beneath the

surface and show you the we have. some of the areas on the shallow end, then we drop down to 20,000 feet, the ping detection coming in at 14,700. you can see how we have a plateau that goes up to about 4900 feet. so a lot of terrain to work with. the ping detext being on the deeper end of it. but as the sufficients and authority there and experts saying it is workable, definitely challenging. the pressure down this low is absolutely crushing. 11,000 psi. so it's incredible. a normal submarine would be absolutely crushed instantly. but of course, we're talking about equipment that can handle these depths. >> absolutely. we should know something within 24 to 48 hours as ships head that way. let's head to beijing to get more reaction. that's where many families of the chinese passengers are staying. pauline, you're hearing that some of the families that had

traveled to kuala lumpur to want to be there are now headed back to china? >> yeah. we're hearing that they are going to be returning to beijing tonight. and these are about 30 relatives who had left beijing a couple of days ago, because they were so frustrated with the lack of information they say coming here from malaysian officials. they wanted to be closer to the higher authorities in malaiysia and really pressure them for more information. so these are the relatives who actually traveled there and they were sitting in on those family briefings and trying to get more information, but i should say that they were very reluctant to go in the first place. many of these chiep nies relatives didn't even have passports. they had to expedite those. they had to expedite visas. so there was a reluctance to go and also the language issue 37 they were afraid of being farther away from their

relatives here. now it looks like they're coming back. there's more of a community here in beijing. about 350, 400 relatives still staying at about four or five hotels across beijing. they do have regular gathering and they do have family brief pgs. so presumably they want to come back into the fold here after accomplishing what they thought they could accomplish down in kuala lumpur. natalie, we did get some reaction from family members about the australian news conference that took place a couple of hours ago, regarding these ping signals. one relative said yes, it is a new clue, but there seem to be new clues every day. so let's just wait until something is confirmed. and on the whole, this weekend, many of the relatives just want to take a mental break. going into this weekend, several of them said we just want to rest because we've been under so much stress. they want to take some of these relatives to the outskirts of

beijing. they've been stuck in these hotels for 30 days now. and also to get some health checks at a sanatorium nap gives you an idea of what they've been going through and why they want to take a mental break, also because they know they're not going to get any definitive information until possibly monday, maybe tuesday on these pings as we wait for that australian defense vessel, the ocean shield to get to the search area where the chinese vessel is. they just want to wait. they're patient in terms of getting con vir fact and they just want to take this mental emotional break today. >> natalie, you talked to one who said even though this is considered an important lead, until they get verification, they just can't get their hopes up. you also said many people were hoping for some sort of miracle and this might dash hopes of a miracle. so we'll continue to follow all the developments from beijing, kuala lumpur and perth, australia. pauline chew for us, thank you. coming up after this break, more on the story on what they are

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>> we're broadcasting to our viewers from around the world and the united states. because asomugha important new developments. flight 3770, search teams off the west coast of australia you know they' been out there for days and days. well, they are investigating now sounds they have detected by ships in the southern indian ocean. those sounds could be from the missing plane's flight data recorders, possibly the cockpit voice recorder or the data recorder. those developments were discussed a short time ago by this man angus houston, the man ahead of the australia search operation. and michael kay, a retired royal

air force pilot broke down the key elements a couple of hours ago. >> a calm, measured and supremely effective response by air chief marshall houston. he hit a couple of critical points in looking towards the family and loved ones. number one, he confirmed the ping from chinese news agency wasn't verified .i think that's very important, just to reduce everyone's expectations. he then said that he was actually talking to the rcy in china, the rescue coordination center in china. i think that's important. we've been talking about the importance of establishing that communication with china, bringing in that information. he then said, and i think this was aimed towards the families, all credible leads will be followed up. and again, that reassures the families that they're not going to gloss over this, so that's great. and then finally, the importance of this really came through when he said he was going to redeploy. we spoke about it early on this evening about redeploying thoses

a spepts that places a real importance of just how significance this ping is. >> it will take 24 to 48 hours before they get some backup from some ships that have more technology to see exactly what the chinese have heard. but up until this point, of course, there's been so many questions and so few answers, to this being one of the most baffling aviation mystery in history. a 777 virtually disappearing. jim clancy has been in kuala lumpur following this story from almost the beginning. here's his perspective. >> stot were by began at the arrival gate in beijing where it was listed as delayed some six hours after it disappeared in the south china sea. >> we have breaking news right now. malaysia airlines confirms it has lost contact with a plane carrying 227 passengers and 12 crew members. flight mh-370 was headed to

beijing from kuala lumpur. it was a boeing 777-200. it was expected to land at 6:30 a.m. local time. now, it's almost 9:00 in the morning in beijing right now. that means that plane is 2 1/2 hours late. >> the confusion, concern and fear at that hour, completely predictable. everyone dreaded the worst, a terrible accident. >> we have confirmed this flight, mh-370 lost contact with air traffic control at 3:40 a.m. this morning. >> most people at initial stage thought that it was a straightforward crash and that you have come down somewhere south of vietnam and the wreckage would be found very, very quickly. >> reporter: malaysia waited to reveal details of its own military radar, the plane had deliberately reversed course, flying back over the peninsula on a heading towards the indian

ocean. >> how much of a turn back it made? 20 kilometer? 10? >> we are still looking at it. >> suddenly anything became possible. wild and intricate internet theories fed fears of an elaborate terror plot led by two young iranians who boarded with stolen passports. the only problem, they weren't terrorists. just trying to begin new lives in europe. suspicions soon shifted to the only people capable of flying the boeing 777, the pilots. captain zahari shaw, some expected has practiced the stel thi turns and changes in altitude on his home flight simulator. but analysis of the simulator's data turned up nothing. no claim of responsibility, no known ties to terror groups among passengers or crew. no motive supported by evidence. intricate analysis of satellite hand shakes took to the search to an area where it likely ran out of fuel. with the plane, all evidence of

what really happened on its flight data recorders. >> we cannot be certain of ultimate success in the search for mh-370, but we can be certain that we will spare no effort, that we will not rest until we have done everything we humanly can. >> reporter: who steered the plane offcourse and why? what happened inside the cockpit? where did the aircraft go down and when will we find a trace? there's an abundance of theories colliding with an absence of evidence. after four weeks here, like everyone else, i have only questions and no answers. jim clancy, cnn, kuala lumpur. >> we have learned in just the past couple of hours, there may be a trace, there may be a clue developing. we will recap the developments we've learned right after this.

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>> ships are headed for an area where chinese searchers have now twice detected electronic pulse signals in the southern indian ocean, holding a microphone underneath the ocean. and one of our expert analysts said that he thought it was encouraging that they heard this signal twice. the second time, just two kilometer from where they heard it the first time. and they heard something every second for 90 seconds. we learned this from australian authorities who held a news conference to make this announcement. they also said the australian ship the ocean shield picked up some kind of acoustic noise in the region. here's the announcement made by the head of search operations. >> this morn, we were contacted by the chinese authorities and

advised that they had late yesterday afternoon redetected the signals for 90 seconds within just two kilometers of the original detection. this is an important and encouraging lead, but one which i urge you to continue b to treat carefully. >> the chinese vessel is going to get some backup quite soon from the hms echo. that's an australia ship that has more so fest kated technolo technology. it is on the way to the region to help verify if this is indeed something significant. however, if this possible lead does not pan out, how much longer can the search go on? cnn posed that question to one of our experts. >> at some point, i have to believe cost becomes a factor. who's going to foot the bill for this going on imperpetuity?

>> that's something i wondered. i'm familiar with the costs of doing this sort of work and it is very expense i. if this pulse does not turn out to be the location -- i hope it is, but if it doesn't turn out to be the location and we're back to square one, so to speak, this shifting search area it seems all the time, you know, could we find it? the answer is, if resources were unlimited, yes, we could because we have the 21st century ability to sense and map the bottom of the ocean in greater detail. turns out we have better maps of mars than we do the bottom of our own ocean. and we can send submersibles down there. i've visited that part of the ocean. if we just put all of our assets and searched the indian ocean for a year or two, we would find it. but that's going to be very expensive. malaysia doesn't have that kind of money. australia, the united states, the international community, i mean, these are some of the

questions that arise in my mind is how you're going to fund a longer term effort. >> but again, the search is intensifying this weekend, thank you to our viewers in the u.s. for joining us for our continuing coverage of this development in the search for the missing airliner. i'm natalie allen. to our viewers around the world, isle be rig i'll be right back with the headlines. i tell people it's for the climate. the conditions in new york state are great for business. new york is ranked #2 in the nation for new private sector job creation. and now it's even better because they've introduced startup new york - dozens of tax-free zones where businesses pay no taxes for ten years. you'll get a warm welcome in the new new york. see if your business qualifies at startupny.com

>> what began as a routine flight for malaysia airlines 370 became the total opposite. leaving behind unending grief and unanswered questions. flight 370, the final hours. here in the cockpit of this malaysian airlines plane, the captain trains this co-pilot to fly the aircraft. calculations, notes and a rare towering storm to avoid. >> see it on the radar penetrating yellow and red. >> adjustments made, the trainee touches down moments later. a perfect landing. it's february 2014 and the

trainee is fariq hamid. weeks later, he would again be in the right hand seat, this time as first officer of malaysia airlines flight 370. march 7, 2014, kuala lumpur malaysia, in one of the busiest cities in southeast asia, millions of people are on the move. including phillip wood, an ibm executive. thousands of miles away in beijing, the day begins as usual for his partner, sara bajak. >> i get up early. i drink coffee and look out over the sun rise. we live next to an apple orchard. i do yoga every morning, eat my oatmeal and go to work. >> in thorly morning hours, phil will take the red eye home to sara in beijing.

the airport connects southeast asia to the continent. paul weeks needs to make it thousands of miles inland all the way to mongolia. >> he was doing this for the right reason. it was a dream job. >> he's the father of two young boys. >> he spent so much time with his kids. he would take them to the zoo. >> in fact, preparing the boys was a major issue before paul left for his 28-day assignment abroad. >> we cried when he left. this was a big change for the family. we prepared lincoln, they had gone to bought him a pad to skype him and a map with, you know, where daddy was going to be. >> when weeks left home, he told his wife he was leaving a few things behind. >> i'm going to leave my wedding ring and my watch. should anything happen to me, i

want the ring to go to the first son that's married anticipate the watch to the second. and i said something to him like don't be stupid, just come back and i'll give it back to you and you can give it to them. >> hours earlier, first officer hameed and shaw passed through security at the airport. >> they're there early and they're going to talk to the dispatcher. >> mile os brien is an aviation expert for cnn. >> they'll talk about the route, the winds aloft, turbulence. and with that all in mind, they will come to an agreement on how much fuel to load onboard the airplane. >> hameed and shaw with enough fuel to go to beijing plus 45 minutes to spare. the passengers arrive for the

flight. bags checked, boarding passes printed. among them chinese painter and ka lig fers returning from an exhibit of their work. a family heading back from vacation with their toddler. two iranian men traveling on fake passports, passengers flying for business and pleasure. as well as the flight crew. the captain and first officer make their final preparations. in a 777 simulator, commercial pilot mitchell cosado shows martin savage the preflight prep. >> so it's going into this system here. >> the pilot loads the route, programming the aircraft to fly to its destination. >> it's essentially step by step going to take this plane from kuala lumpur to beijing. >> the plane is ready. paul weeks sends a message home. >> the last line was, it's only

27 days until i see you again. >> around 12:30 a.m., that laze yeah airlines 370 pushes back from the gate and gently eases towards the runway. the aircraft is cleared for takeoff. >> let's go. >> all right. >> the brakes are off and everything is set. >> the captain boosts the massive engines. >> the plane roars into the sky. its altimeter tracking its climb through 5,000 feet then 10,000 feet. now airborne, air traffic controllers pick up the flight. >> they're going to see you on your radar because you've got what's called a squat code in your transponder which turns your simple radar return into something that has a lot of information on it. it includes the flight number and the speed and the altitude.

>> this is many laze yeah here and vietnam here. cam bosnia on the left side. >> as the plane reaches its cruising algt tuesday, the pilots can relax a little. so can the passengers. it's 1:19 in the morning and a voice from the cockpit addresses air traffic control for flight 370, it's been a routine evening. coming up, an aircraft with 239 people aboard vanishes completely. >> it's got to be some practical joke. and then it stayed missing and it stayed missing.

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a. >> march 8, just before 1:00 a.m. malaysia airlines flight 370 and its 239 passenger and crew are 35,000 feet above the gulf of

thailand, cruising comfortably in a boeing 777. >> the 777 was a pivotal aircraft for boeing and the 777 has a sterling safety record. >> it's extremely safe. it's triple redundant. there's at least three backups for every system, electrical, hydraulic. >> in the cockpit of flight 370, sahari ahmed shaw, a captain with over 18,000 hours in the air and a stellar reputation. >> he's the kind of guy i want to fly with. he's everything that you would want to have taking you down to the ground on that dark and stormy night. >> seated beside him, 27-year-old first officer fariq hameed. >> with the amount of experience he had would never be flying a

777 in the u.s. that would be unheard of. this guy was doing well. >> doing so well that fari fariq hamid had just finished training and it was his first time without a check co-pilot. nearly 30 minutes off the takeoff, all seems well from a message sent with the communication system. >> that's kind of a little check message, just checking in. everything about that indicates a plane at cruise, everything is fine, everything is normal. >> 12 minutes later, at 1:19 a.m., a handoff with air traffic control. >> what happens during these handoffs is the controller in the station that is giving an airplane over to another sector gets on the phone to the next sector and say hey, i have malaysia airlines 370 coming your direction, do you see him?

okay, i'm going to give him a handoff. he'll check with you shortly. >> someone in the cockpit signs off with good night malaysian 370. but just two minutes later, signs of trouble. >> so everything kind of goes quiet all of a sudden in a hurry. at 1:21 a.m., the plane's transponder goes silent. >> when you turn it off, it's like lights are out. no voice communication. >> and no signal to air traffic control with the plane's location, speed and altitude. >> it could have been physically turned off. there could have been a circuit breaker pulled, or there could have been some sort of catastrophic failure on the plane which caused an electrical disruption. >> then the 777 makes an unexpected left turn heading west and way offcourse. >> what we see is a quick turn,

almost 180-degree turn back towards land. >> according to a source close to the investigation military radar then shows the plane dropping and flying as low as 12,000 feet. t >> the controller on the other end is expecting a call from the aircraft. >> but the call never comes. >> there was repeated attempts to reach the aircraft. not only on the 120.9 frequency, which was the frequency they were assigned but also on an emergency frequency. >> there is no answer. >> they're going through their checklist for a missing aircraft, an aircraft that has apparently fallen off the radar screens and is not communicating. you know what's going on? >> at 2:40 a.m., a worried air traffic control tower alerts malaysia airlines. they've lost contact with the plane. flight 370 has disappeared.

by 6:30 a.m., the sun is rising over beijing. the same time flight 370 is scheduled to land. but there is no plane and no sign of phillip wood, paul weeks and the 237 other passengers and crew members onboard. coming up, the news no one could prepare for. >> after more than 30 hours without any contact with the aircraft, we believe that the family members should prepare themselveses f for the worst. (dad) well, we've been thinking about it and we're just not sure.

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>> a large 777 jet is missing. and the news quickly makes its way around the world.

>> families start to gather at centers in kuala lumpur and beijing. >> in a few hour, disbelief set in, this can't be happening, it's surreal. >> it soon becomes apparent it's going to be difficult for families to get clear information. and anxiety turns to anger. this woman is telling families she can't get them an answer until noon the next day. no, answer us now, this man yells. >> at this stage, it's just blank. just blank waiting. and praying.

danika weeks waits for news. >> the good news is malaysia hasn't had to deal with this before. the bad news is malaysia hasn't had to deal with this before. we're in a situation where we're watching them kind of learn how to do this and it's unfortunate. >> we go back to square one. >> with a lack of clear communication, speck lags and theories apound. >> could it have been mechanical? you know, structural failure that caused rapid decompression? it's possible. i would say when you weigh all the evidence, the balance is now moving towards some sort of intentional act. >> but what kind? >> a rogue crew intent on hijacking? or murder/suicide? or maybe a terrorist organization. that theory gets a boost by two passengers traveling with stolen

passports. it's later determined those men are seeking asylum, not trouble. but that talk of terrorism surprisingly gives sara bajak hope. >> if i was a terrorist, would what i do? i would want to protect the very valuable assets of people on the plane. >> as the families press for answers -- >> china has deployed two ships to search the south china sea. >> investigators are scouring the seas. the problem is, they don't know where to look. first they concentrate towards the malaysia peninsula, but then they expand east towards vietnam. >> and west towards the endeman islands. but there's another problem. >> the way the international investigators have been working together is kind of like a bunch of teenage girls running around a locker room all trying not to

show each other what they've got. the. >> the u.s. is there, the uk is there, australia is there. but who is in charge? it has to be managed better than it is in order to get those answers. >> the answers begin to come fast and furious with the discovery of several satellite pings sent from the plane, referred to as hand shakes. >> there is a box on the plane that gets you the satellite. that box was still alive. so it's not unlike your cell phone. if your cell phone is on, even wh when you're not making a call, the cell tower is saying hey, i'm here. >> those hand shakes give the satellite company another informing to reconstruct the plane's likely flight path. surprisingly, the data shows the 777 flies for several more hours after disappearing from radar. and ends in the south indian

ocean. the constant changing conflicting news puts families in a tail spin. >> it's a roller coaster ride. but i felt like i had some positivity. that, you know, he was coming back. >> often march 24, that positivity is dashed when malaysia airlines sends families they haven't been able to contact this text. malaysia airlines deeply regrets that we have to assume beyond any reasonable doubt that mh-370 has been lost and that none of those onboard survived. a short time later, malaysia's prime minister make answer announcement.

>> the flight mh-370 ended in the southern indian ocean. >> what was the hurry to make that statement? if the malaysians thought that was going to make people feel better and go home and be happy, it didn't work very well, did it? >> and sara bajak is still trying desperately to cling to hope. >> i'm coping through it. there's just this huge vacuum because, you know, it's not only that phillip is missing and by any reasonable person's calculations, he's most likely permanently missing, i can't quite accept that, because, you know, what my head is telling me and what my heart are telling me are two very conflicting things. >> as she hopes, the data is

fine tuned. the search area shifts again anticipate the world waits. >> you can't stop thinking about this and wondering. because how could it be in the 21st century that a modern airliner could go missing. how could that be? of. >> i think it boggles peoples minds and we just need to know what happened. >> a mystery unsolved, clues scattered, questions unanswered, and heart broken families left to pick up the pieces.

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-- captions by vitac -- www.vitac.com this is cnn breaking news. >> and welcome to our continuing coverage of malaysia flight 370. to our viewers around the world and in the united states we thank you for joining us, dramatic developments in the search for the airplane and the data recorders to tell you about. search planes and ships are heading for an area where chinese searchers have twice detected electronic pulse signals in the indian oceans. the australian ship "ocean shield" has picked up acoustic noise as well with its listening device. >> this morning we were