Signals consistent with those emitted by aircraft black boxes on two separate occasions. I can tell you that ocean shield has been able to reacquire the signals on two more occasions. Late yesterday afternoon and late last night perth time. The detection yesterday afternoon was held for approximately five minutes and 32 seconds. The detection late last night was held for approximately seven minutes. Ocean shield has now detected four transmissions in the same broad area. Yesterdays signals will assist in better defining a reduced and much more manageable search area on the ocean floor. I believe we are searching in the right area, but we need to visually identify aircraft wreckage before we can confirm with certainty that this is the resting place of mh370. For the sake of the 239 families, this is absolutely imperative. Today the ocean shield is continuing the slow, painstaking and methodical work to refine the location around the four acoustic detections. We are not yet at the point of deploying the autonomous underwater vehicle. The better ocean shield can define the area, the easier it will be for the autonomous underwater vehicle to look for wreckage. Giving the shelf life of the battery is 30 days and it is 33 days since the aircraft went missing it is important that we gather as much information to fix the possible location of the aircraft while the pingers are still transmitting. Theyre still transmitting. A very stable distinct and clea that it consistently pulsed at a 1101. 6 second interval. The transmittal was not from a likely origin, and they believe to be the signals consistent with the specifications and description of the flight data recorder, you may notice that the size of the search area has significantly reduced over the last couple of days. Based on ocean shields detections, we are now searching a much more concentrated area based on the drift predications made possible by ocean shields detections. The smaller area has also allowed us to plan much smaller search patterns based entirely on search principles. In other words, we have intensified our search. And of course, as soon as we finish the towed pinger locater work and hopefully well get some more transmissions to better refine the point on the ocean floor where the transmissions are emanating from, once we have got that, and there is probably no more hope of picking up anymore transmissions, we will put the autonomous underwater vehicle down to have a look. Now, hopefully with lots of transmissions well have a tight, small area. And hopefully in a matter of days we will be able to find something on the bottom that might confirm that this is the last resting place of mh370. And i stress, i cant stress enough the families have to be considered when you report all of this. Because they want a bit of certainty. We dont get certainty until we have a visual sight of the wreckage. Air chief Marshal Angus houston there calling this a great lead. He is now confident that they will in fact find what is left of the aircraft in the not too distant future. And that timeline really depending on how much time they decide to devote to continue to try to find anymore pings from what they believe to be black box or flight data recorders. Once they determine that there is no more point or anymore trolling along the surface of the water using the devices that they have, they will deploy the autonomous underwater vehicles to use the sonar to try to map the floor and bring back the wreckage. I want to bring back david souci, boeing captain, and aviation analyst, and private pilot, miles obrien, former inspection director mary sciavo, and a former cnn analyst, david gallo, he coled the search for air France Flight 447. Lets put the map up that was just released in that press conference on the screen. I mean, richard as you look at this what jumps out at you . Explain what youre seeing here. Right, what youre looking at is the various moments when over the fourpinger locations that are being detected. The first and second were on saturday. The third and the fourth were on tuesday. Now, we can only see on this map where they lost the first and the second, and that is also because the time distance was greater, one was two hours, 20, the other was 13. By the time you get to number three and number four youre really talking about a matter of minutes, 532 and seven minutes. These are detections being made by this device, which is being towed how many how far behind the ship . Could be as far as five miles behind the ship. So when you look at this, im not real clear on this, it does say towed pinger locations, is that the location of the ship . We believe it is the location of the towed pinger. And moving up walking speed is what he said. One kilometer. So the fact that it is so spread out, what does that tell you . It is confusing to me in some respects because of the fact that the pinger should only be transmitting between three and five nautical miles. When you put it on the map it appears theyre too far apart to be practical. There is also refraction that can happen. It can ping up, and then reflect back down so that extends the range significantly. Miles obrien, i mean, they are all around that line in the middle which is the satellite hand shake confirmation. Correct . Yeah, i guess one of the big things missing on this map is what is the scale of the map . It is at the bottom it is well, the scale is 20 kilometers. There is about 20 kilometers between i suspect you know, i do unpredictable, i suspect that may have something to do with it. Clearly they want to have more of these contacts because the more they can lay them over each other the more they can find the box. The term that mr. Houston uses, triangulation is not exactly correct because they dont receive actual data. So what youre doing is bounding boxes. Youre not really triangulating in the perfect sense of the word because that involves directionality. When you talk about the Autonomous Vehicle under the water, and you look at the map, the 20 kilometers is the scale on the map can you predict how long it would take . I mean, if you made a grid search in this area between the spaces where the sonars were detected do you have a sense of how long the search would take . Well, with the air france 447, we did about 25 square miles, im sorry mixed miles in kilometers, 25 square miles every day. That is awfully slower than most people would go. But we wanted to go low and slow so we wouldnt miss anything. So i think youre looking just to get those in one sweep you could do those in a day or two. Something like that. That is not enough to make a map, you would want to make a bigger map than just one or two swings. Im thinking a leap to cover that in the area. When you talk about the topography on the valley floor, and the valleys and peaks does the Autonomous Movement signal that they have proven in the past not to be too reliable. So that is problematic. The other thing is that the depth on the northern part of where the ocean shield has been is deeper than the bluefin21 will go. That will be problematic, so i dont know where they plan to do the survey but theyre on the edge of their operation depth. And david gallo, were looking add the planned ocean shield, the wallaby plateau. Right, it stands about two miles above the surrounding sea floor, about two miles in width. And the volcanic structure is covered probably with sediment, so the northern flanks will have gulleys make it difficult. Were measuring the distance between the detections. And maybe david gallo can assist us in understanding. David, the distance between the first and second seems to be about 14 or 15 kilometers. Between the second and third is about 14 to 15 kilometers and the third to the fourth is about ten kilometers. If you then go to total length from top to bottom from number one to number four or even the total from one to three which is the farthest extremity that is what i need no, yes, it does seem reasonable. And their vehicles, the ones they have i think there are a couple of maps. They can go for about 20 hours. Again, they can get all of them in one sweep if you get it right. Normally it doesnt work that way. You set up a sort of grid in the certain area, and inside that grid would be contained in this area. You want to go outside this area. So david, what were looking at is a center radius of about 14 miles, well, lets say it is 20. So if we go 20 and calculate the surface area were talking about 3900 square kilometers of search area. So how long does that take . Well, again were jumping into you know, the aircraft with 5,000 square miles. And that was would have taken with one vehicle would have taken seven months because we were going low and slow. But we brought three vehicles in that particular case. So again, it depends a lot on how with the size of the so you can operate multiple autonomous underwater vehicles at the same time . One ship. In fact that was the secret to aircraft, we boiled it down to one team, one mission to find the aircraft. Everything else we bloted it off the white board and went as simple as we could go. You were saying you blotted out everything, you told your team dont think about what the pilots are doing. Just simply look for the wreckage. Exactly right. That is exactly one of the things we said. We dont care what anyone was thinking about, how it got here, for instance in this case if you know it is on the north slope of that under water edifice, along the plateau, lets go make the best map that we can of that plateau. And anything that doesnt belong there will stick out. So without getting caught up in anything else, were just sticking to the goal of making a really good underwater map and what is there will show up. All right, were going to take another short break, you have been listening to david gallo who coled the search for air France Flight 447. A lot more details to talk about, more details from perth right after a quick break. A mom, a university of phoenix scholarship recipient, who used our unique scratch that awesome careerplanning tool. And thats a student, working late, with a day job, taking courses aligned with the industry hes aiming to be in. Ready to build an education around the career that you want . Lets get to work. Ben [ train whistle blows ] oh, that was close. You aint lying. [ ql guy ] let quicken loans help you save your money. Well be here at lifelock doing our thing you do your connect to public wifi thing protecting you in ways your Credit Card Company alone cant. Get lifelock protection and live life free. 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Two pings received last night helping searchers narrow their focus and intensify their effort. And Angus Houston, being very careful of the family members of those on flight 370. But confident that the pinger may soon be located. He says this is a great lead and is optimistic well find what is left of the aircraft in the not too instant future and talked about deploying the autonomous underwater vehicle, once they exhausted all possibilities on the future, which again he doesnt believe is very far off. He is also very careful to warn the signals were weak and couldnt say whether or not both black boxes wer e es were worki listen. This assessment was, there were two pingers there. This has not been confirmed in the further detections we picked up. Now whether that was because one pinger has run out of battery life and there is one running or we just havent gotten close to it, i dont know. But the fact of the matter is we havent had any further evidence of two pingers going off in the same area or at the same time. One of the important things about this sort of search is the need for complete completely noiseless environment. If you had other ships there, you would end up with a very noisy environment and you wouldnt get the sort of search that weve got at the moment. I mean, we are looking at this stage for transmissions that are probably weaker than they would have been early on because the] batteries are both devices passed a use by date. And they will very shortly fail. In terms of ocean shield, the more detections we get the better. And the other thing that comes into it is the quality of the transmission and the detection. What were after is the best return that we can get from the deep. And by triangulating all of this positional data, we will be able to come up with a much more sharply defined search area, a much smaller search area under water. Caution again what were picking up is a great lead. Okay . Weve got to visually acquire before we can say this is theni final resting place. So there is still a way to go. But if you had asked me lets say when i arrived last sunday night, i would have been probably more pessimistic than i am now. Im now optimistic that we will find the aircraft or what is left of the aircraft in the not too distant future. But we havent found it yet because this is a very challenging business. Very challenging business indeed as weve seen over the last few weeks. You know, it is a little confusing when you look at this map, the four locations that they have. And then on the lefthand side, actually there is another map where you see the planned search area for the ninth of april. In the red there it is or not far. Within 20 or 30 kilometers of the pings, but why would they be looking in that area . If you read what he said yesterday it is because they are taking into account, do not worry about the other search areas, Angus Houston said, the aircraft in the sky has been looking for wreckage on the surface and they have been taking into account 30gs da oceanic drift. What you were saying. The ping areas are where the aircraft goes into the water. The search areas are where they forward drift for wreckage. Based on currents, based on the amount of time. And wind. David, how precise a science is that . They have not found any debris thus far. But the ability to kind of predict where debris goes. Yeah, it depends on how good the model is, of course. Anderson. And in the case of air france we had a committee working on backtracking of the debris. And sadly, they led us into two months of survey in an area where the aircraft was not. Which caused all sorts of trouble. You lose confidence. People say you were looking for two months, you were sure the plane was in the area, you havent found it. The models were wrong. It is an incredible science, a little bit of witchcraft, a lot of magic, when it works great it is fantastic. And when it doesnt work there could be trouble. But david, i had a quick question for you. Isnt this much more simple because youre doing forward drifting instead of reverse drifting . Because if you look at all the debris you have to consider all the pieces of debris and where they would have calculated back to a single point whereas now what we have is the pinger and trying to locate that drift forward. Wouldnt that would it make a difference between forward forward drifting means you know the point of origin, now youre trying to figure out where it went, as opposed to finding what you find. So the math is easier. David, well, ive been asking that question all day. As a matter of fact, i thought okay, if we think this is the area where the impact would have been then we can forward model and find out where there should be a debris field someplace. But im not getting straight answers and i must be asking the wrong questions or im not speaking the language of the driftologists. But this is very true, it should lead us to the point where the drift is. That area you asked about anderson, i have been watching all day. There have been a cluster of about eight ships all day in that box, and just to the east on the plateau is only ocean shield. So separate from this other flotilla of other ships, im not quite sure. So they will continue obviously along the line of where they received the pings. Theyre going to continue ocean shields with the towed pinger locater, but again we dont know how long that will go for. Basically they will just make an assessment of when they think theyre diminishing returns, or when they think they will no longer get pings, correct . I think that is true, what the marshal said and i believe that is probably the best thing to do at the moment. And of course, theyre assessing when to put or whether they can put the bluefin in the water, or if theyre at the right depths to put it in. They dont want to risk losing the vessel. The other thing they have to do, anderson is they have to make a map of that so you get a first order of map. Because right now there are no maps of the underwater terrain there. And they can do that fairly quickly from the surface. And im assuming the ocean shield can do that. Miles obrien, i keep coming back to some of the things that Angus Houston was doing invxaes press conference that took place more than an hour ago. This is certainly the most optimistic weve heard officials. The closest any official has come to saying we know where the aircraft is. It does sound like in relatively short order, they are going to have autonomous underwater vehicles, at least one underneath the water doing a grid search, trying to find this wreckage. And i mean, we could be talking about a very short amount of time before if theyre in the right area, something is found. We could be talking a matter of day