Partial hand shake theyre calling it. Weve had six pings where they know the plane tried to connect to the satellite, and we know they were confirmed. And then there was the seventh, the partial ping. They couldnt say, and they were quite open about it, they couldnt say why, and they couldnt say the significance of it. Today, they said that they dont believe this partial ping was done by human intervention. In other words, this last ping only eight minutes after the previous one 8 11 a. M. Was believed to be the last communication from this aircraft. The sixth ping, yes. The sixth ping. Then you have this partial one eight minutes later, 8 19. The significance is, no human intervention, so nobody has tried to switch it on to register on the network. The significance, this is the plane, because its a ping not coming from the ground station that way, its the plane to the ground station, and this they believe is very significant or will be in honing down exactly where the plane was, because its only eight minutes. David, early on the 8 00 program, this was called a potential game changer. Do you agree with that . Absolutely. I can derive some information from it, as well. That satcom system is capable of sending a signal when it senses an emergency, which tells me there was still something connected to it. The acars system stopped sending information, so somehow that connection was broken. Whether it was turned off or the wire to it. The satcom has other systems that would still tell it to say im in trouble, i need help, try to connect. And les abend, we talked to miles obrian in the 8 00, he suggested that partial ping could have been from an electrical surge or even the plane hitting the water, which would really help investigators zero in on an area to search. I contemplated that for a little bit. What i thought it might be was the fact that the last engine shut down or flamed out, because of fuel exhaustion, which would have this airplane is designed to deploy a ram air turbine, which operates one system of hydraulics, the other of electrics. That deploys that automatically, which would probably not be a priority for that one last electrical system and that would shut off the communication to the satellite one less time. Still could give a time frame for knowing when the last engine went out. Its possible, but its speculation on my part. If these various pings show a radius of x miles where the plane could be, on the sixth one, youve got up to an hour out of it where it could have been. But a ping only eight minutes later, you can drill down and prove the significance of that. And suddenly you are honing in on a much smaller area to search. It will still be huge, but it will be a significant improvement. Family members in beijing today protesting out in the streets, wanting journalists to see them being held by back authorities trying to get to the Malaysian Embassy to protest what they say is some sort of a coverup. What do we know about the search efforts under way by the u. S. Navy, australia, new zealand, china, even korea now, japan, whats going on today . Reporter weve just gotten the latest update, and what were hearing from the Australian Authority thats overseeing all this. We know that there are four search planes over the search area, being divided in three separate areas. Three more are coming, a total of 12 will take to the air. The most planes that weve had since this entire search off of the coast of perth since it all started. As far as the sea vessel, the Australian Naval vessel is zooming its way toward debris spotted on monday, hoping to retrieve that debris. David, a lot of anger from the families in china. We have not been showing pictures of them in their moments of grief and anguish out of respect for them. Today, a different story, which is why we are showing the pictures, a show of strength protesting in the strengths of beijing, something unheard of in china, trying to get to the Malaysian Embassy. Do the families have any reason to believe that theyll start to get more information . What was the result of this unprecedented protest . Anderson, it was unprecedented, as you say, here in beijing and the heart of the communist party. Very unusual to have a protest like this that isnt quickly wrapped up by authorities with people detailed. So in this case, the family members got out from that hotel, they gathered a very organized protest and walked all the way to the Malaysian Embassy and got into that area. Keeping press away were police in uniform. What they want is evidence. They say they want actual hard, visual evidence of debris. Otherwise they wont believe what theyre hearing from the malaysian government and the Malaysian Airlines authorities. Theres a great deal of mistrust here between the families and the authorities. And until they see that, they wont believe it. Anderson . Kyung, what do we know about the new piece of equipment from the United States thats arrived in perth . Reporter its just arrived here within the last hour or so. We did get confirmation from the United States embassy in kuala lumpur that this piece of equipment, its a high tech piece of equipment called the toad pinger locater. The best way to think about this, its like a giant hearing aid that goes into the water and it can hear those inaudible to our ears pings coming from the black box. But heres the problem, until the debris is found, its just going to sit here in perth, because they have to first find the debris, then they can use it. David, what kind of formal pressure does the Chinese Government continue to try to exert against malaysia . There has been no love lost in this issue with the plane going down and the chinese, even the official Chinese Foreign ministry saying they want more evidence, as well. So through the days as this drags on, the Chinese State media has put out very pointed editorials, at one point saying the malaysians at best showing a dereliction of duty. Thats fed in in some way to this anger shown by the families. Certainly, both through their actions in terms of the major assets china is sending for the search, and through their words, theyre ratcheting up the pressure on malaysia. Let us know what you think on twitter. Coming up, how do you find a plane in the ocean . Well show you how waterproof microphones are listening for any pings from those black boxes. And other breaking news. The death toll climbing in the Washington State landslide. Ameriprise asked people a simple question in retirement, will you outlive your money . Uhhh. No, that cant happen. Thats the thing, you dont know how long it has to last. Everyone has retirement questions. So ameriprise created the exclusive. Confident retirement approach. Now you and your ameripise advisor can get the real answers you need. Well, knowing gives you confidence. Start building your confident retirement today. Hey there, i just got my bill, and i see that it includes my fico® credit score. Is that new . Yup, you have our discover it card, so you get your fico® score on every statement. And, its free. Thats pretty cool of you guys. Well, we just want to help you stay on top of your credit and avoid surprises. Good. I hate surprises. Surprise whoa. Is it your birthday . Yep. Cheers. At discover, we treat you like youd treat you. Free fico® credit score. Get the it card at discover. Com. Predibut, manufacturings a prettin the United States do. Means advanced technology. We learned that Technology Allows us to be craft oriented. No ones losing their job. Theres no beer robot that has suddenly chased them out. The technology is actually creating new jobs. Siemens designed and built the right tools and resources to get the job done. Our breaking news tonight. The search is back on for flight 370. And wit everyone hopes only answers. Complicating the effort determining how far that plane flew after running out of few. Tom forman shows us how investigators have been doing that. Reporter in terms of a primary search area, were no longer talking about millions of square miles, but about 621,000 square miles. How do you break down something that big, even with a lot of assets . This is how its done. Imagine our plane coming in here over this search area in the indian ocean, and this is what they essentially do, they will impose a grid on the ocean. But all of the squares of this searchable area are not equal in value. For example, in this case, you might say the most likely place is the middle, because thats simply where all the averages come together. Thats where you have chosen this square. That doesnt hold true necessarily as more evidence comes in. For example, they have some idea that if this plane were flying slower or faster, it could shift left or right. What about when it ran out of fuel . They dont know when it ran out of foul. And if this thing is flying 400, 500 miles an hour, very, very far off in terms of that distance. So if the fuel depleted quickly, at the earliest possible point and there was no glide at all, then you push your primary search area way up here. And the rest of it becomes a less important box. But if the opposite is true, if the fuel calculation is off so that it went as far as possible, and it glided as far as it can, a plane like this can glide well over 200 miles, now your primary search area moves much further away. Thats why the box has to be so big to accommodate all these possibilities. And yet even as it has that size, they try to cut it down a step at a time to increase the probability theyll find this plane. Testimoom, thank you very mu. Thats why this news tonight is so significant, because it does help try to focus the area of the search if in fact the attempt at a hand shake is when one of the last engines went out, or perhaps when it went into the water. We want to look at the tools that search teams can use in the indian ocean and will use. Sonars, hydrophones, waterproof microphones. Stephanie elam is off a boat in the pacific ocean. Reporter its really Interesting Technology and its a difficult task. Im joined by james coleman, and hes going to show us the hydrophone, show us the difference between this and son sonar. How does this work . This is a hydrophone and theres a number of varieties of them, but basically its an underwater microphone. This is the kind of device theyll be using in order to listen for that underwater pinger. How far can it hear . Only about five miles. You need to find the wreck site. If we go from this, lets take a look at the sonar. The sonar is what youre going to use if you get a little bit closer. This is an example of a sonar. It will emit sound and as it receives it back, it will build up a 3d map. Lets go inside and take a look at how this data is translating, starting off with the data coming in from the hydrophone and how that looks when you let this computer hear what its picking up. The hydrophone, you could put it on your ears and listen to whats in the ocean and youre listening for that once per second click. This is a spectrum of the noise in the ocean. This is ocean noise here on the boat. If that pinger were nearby, we would see a sharp spike at the 30 to 40 kilahertz. You also have this coming in, which is the sonar, correct . Exactly. This is the mapping sonar. Were looking below the boat and getting that information that comes back. Were building up a 3d point cloud, as well as a visual display of whats down there. We have a pipeline, a tire, some different on struck shups. You can see that, and this put all together can tell you go back and look at it. Unless youre right there, youre not going to be able to pick this information up, so you have to go through and look at this data very slowly. Stephanie, how long does it take to scan an area of the ocean floor . Well, in the southern indian ocean, because it is so deep there, you have to work to get this equipment as low as possible down to the ocean floor. And then trailing it behind you. Think about how long that cable is going to be. You cant go too far or too fast because you might lose a connection. So youre talking about painstakingly slow work to go through the ocean, especially when you have not really a good idea where it is. It takes a very long time. To that explains why this process has been so long in the southern indian ocean. Back with our panel. David sousi, Richard Quest and les abend. Im really fascinated, and we talked about it at the top of the program, this partial attempt at a hand shake. Lets zero in a little bit more what could have possibly caused that. Do you believe the idea that perhaps as the plane went into the water, it might have caused a surge that would have attempted this partial hand shake, anything to that . Surge is a wide term, but when i think of a surge, youre talking about an Electrical Supply difference, which in my mind wouldnt have caused that but what would have is the input, something being input into it. So yeah, i think thats highly probable. My scenario that this bus system that took over from this ram air turbine that we talked about at the top of the hour, that will surge. Your Instrument Panel will momentarily go blank when youre using it, but that could be a surge situation there. Richard, are we any closer to understanding, are investigators any closer to understanding whether or not the plane was on autopilot or annual control, given the turns we now know the aircraft made . No, were not. We know the first turn, then the west turn, then theres the turn, the long turn that takes it down into the south indian ocean. Clearly, no pilot is going to be standing there or sitting there holding the controls for the full several hours. I think thats highly unlikely for six, seven hours as the plane comes down until fuel exhaustion. But even if its not on full autopilot, the plane will keep going. Its a myth that you take your hands off the controls and the thing turns. If both engines go out, and it depends how quickly they go out in terms of a turn or remaining straight, but how long can the plane just basically glide for . David can correct me on this, but its going to reach its own natural stability. In this airplane, its electronic stability. Its an airplane, its going to fly even if it doesnt have power. Thats what it is meant to do. If one engine goes out, it naturally finds its own center. Say the right engine goes out, that wing will reach a flat spot and create more lift than this one. So that weight is underneath the center it can go for some distance . Absolutely. I think 20 something miles. It depends on the altitude. I thank you. Find out more on the search for flight 370 at cnn. Com. Just ahead, well talk about the ghost plane theory, the possibility that investigators are looking at that the plane was on autopilot for much of its journey, that the crew and passengers were incapacitated. Plus, breaking news from inside the United States. Up to two dozen now known dead in the landslide north of seattle. The search under way, has been under way all day for any survivors and for those still unaccounted for, new developments tonight, ahead. This is the first power plant in the country to combine solar and natural gas at the same location. During the day, we generate as much electricity as we can using solar. At night and when its cloudy, we use more natural gas. This ensures we can produce Clean Electricity whenever our customers need it. [ male announcer ] how could a luminous protein in jellyfish, impact Life Expectancy in the u. S. , real estate in hong kong, and the optics industry in germany . At t. Rowe price, we understand the connections of a complex, global economy. Its just one reason over 75 of our mutual funds beat their 10year lipper average. T. Rowe price. Invest with confidence. Request a prospectus or summary prospectus with investment information, risks, fees and expenses to read and consider carefully before investing. Welcome back. More breaking news as the death toll rises in the Washington State land slide. Up to two dozen people confirmed dead. The fire chief saying tonight two more people were pulled from the rubble and they believe they found eight more bodies. One of the victims found this morning has been identified as u. S. Navy commander. The fire chief said that its been a challenging search effort with so much debris. What were finding is these vehicles are like twisted and tore up into like pieces. Its just amazing the magnitude and force this slide has created and what its done. Its not just done that to cars, its done that to these buildings. And so your carpeting and photo albums and streaks and boats and woodpiles and all these things, and all this mud thats heavy. One part of the mountain collapsed saturday morning north of seattle. A wall of mud buried everything in its bath. The debris field is a square mile. Here are two 911 calls that have been released by authorities. We have a freaking mudslide. All i see is dirt. We watched hundreds of trees come falling out of im on sea post road highway 530. And theres not even a house here anymore. Are there any injuries . Yes. Theres people yelling for help. My neighbors house and their neighbors house have been completely taken out. And its collapsed on several of them. Theyre trapped. You know theyre inside the home still . Yes. Im standing in the location right now and i can hear them tapping underneath and yelling at us. Just hor risk. On saturday, rescuers found this 4yearold boy stuck in the mud. Tonight, the hope of finding anymore survivors is fading. The death toll has risen. Gary tuchman joins me now. Gary, what are they saying about how the search is going, are they even able to search at night . Reporter no, theyre not able to do anything at night. Its pouring rain right now to boot. Its a very dangerous area. Its basically, anderson, its like quick sand. Some people described it as a mud tsunami. Thats why they cant go full force at night. You could step in a hole thats five or six feet deep full of mud and water. Its very important to mention that emergency officials are telling us their top priority is still at this hour to possibly find survivors. We know those are not just empty words. Weve seep it before in tornadoes and hurricanes that people have been found days or weeks later. But the sad news today, two more bodies found. They say they saw at least eight more bodies they cant get to. So they do believe at least 24 people are dead and maybe even more than that. There are hundreds of emergency officials at the scene. What were being told is amon