The search area has changed dramatically. This is a huge change. It was 29,000 square miles. Its now 22,000 square miles. That drop in just one day. The search area is now roughly the size of west virginia. Yes, still huge, but remember, we were talking about a search area originally bigger than the continental united states. And they have picked up new signals that they say could be from the planes black boxes. It had been two days, as you know where they said look, were feeling worse about this and worse about this. We havent reacquired the signal. Now they have two more times. Could this be it . The question is time is running out. It is day 34 of the search. The batteries in the black boxes are fade mortgage as each day passes. Its pretty incredible if in fact they are still working at this point. The australian ship ocean shield i was just showing you first picked up two sets of underwater pings on saturday, and now reacquired the signals twice australia time tuesday. All four signals detected within 17 miles of each other on the surface that could mean a lot of things when it gets to under the water. But on the surface. Michael holmes is in perth tonight for us. Michael, how close do they think they are to finding the plane . Well, you know, erin, its interesting listening to the man who is heading up this head search, air chief Marshal Angus houston. He did say the wreckage needs to be identified before any certainty that this is indeed the area where the plane is. But, you know, what was interesting is he said the pings were sustained and consistent with a flight recorder. Not random or natural marine noises. And why its interesting to me certainly is this is a man not given to hyperbole or raising hopes. This is a very cautious man. And for him to say as he did yesterday that he is optimistic, not cautiously optimistic, but optimistic that the wreckage will be found is really quite something. Were waiting for the planes to head out today. More than a dozen planes going out. A dozen ships out there. As you said, the search area has been shrunk. But its interesting too where the four pings were, theyre trying to triangulate those. Theyre looking for more pings. Its sort of like a cell towers, pinpointing where a cell phone is. The machine, the u. S. Navy machine that is going along behind that Australian Navy vessel, the ping locator, its not directional. So it doesnt get the ping and tell you exactly where these things are on the bottom. Its omni directional. So theyre trying to triangulate those pings and shrink that search area down even more. Of course, thats really just the beginning. Then theyre going to send the bluefin submersible down to try to map that ocean floor and see if they can find the wreckage. And then theyd have to get the sort of underwater vehicles that could recover things like black boxes. It could take weeks and weeks and weeks, even if this is the right location, erin. Michael, thank you very much. Michael mentioned the bluefin, how crucial thats going to be. We have the ceo of bluefin on later this hour. And a special report coming up out front, investigation on exactly how that triangulating will be happening. But joining me now is bob ballard, the underwater explorer who found the wreckage of the titanic. Bob, its great to have you with us. You know more about this than anyone. You recently have gotten planes out of the water. So here is the bottom line question. Do you think that they are now looking in the right spot . Yes. It looks like the search area is collapsing to a square that you can now mount the next vehicle system. What they want to do now is take advantage of the pinging to make that search area smaller. Eventually theyll be happy with the size of the box or the pingler stop pinging. Theyre also trying to figure out whether theyre listening to two different pingers. Theyre in the end game. This is very encouraging. They now have the auv, the autonomous vehicle, very similar to the ones that were used on the french airlines. As far as im concerned, theyre in the end game. I would be surprised if theyre not able to begin launching the auv within a matter of days once they have closed the box. Wow. Well see what the bluefin tells us. Bob mentions two pingers, there should be two, a cockpit voice recorder and a flight data recorder. Now, bob, assuming they are in the right location, i just want to show this to our viewers, because this is where no one knows this better than you. The wreckage is going to be so far down if thats what they find. Empire state building used to be the tallest building in the world. But that would be 1250 feet down. So everyone, you can see that. The titanic, which is the one bob discovered, 12,451 feet down. Almost three miles, everyone. The bluefin underwater device, which bob just mentioned can work in a maximum depth of 14,763 feet. Very specific level. 14,800 feet is the depth at which the pinger signal so far has been detected. So bob, when youre talking about distances this deep beneath the water, pressure increases exponentially when youre talking about a few hundred feet. Are they going to be able to get down that far . I dont think thats going to be the issue. The bismarck was deeper than that. It was 16,000 feet. The yorktown from the battle of midway was in 18,000 feet. Most oceanographic organizations design to 20,000 feet because that gets you 98 of the worlds oceans. Yes, its deep, but its certainly depth that weve worked in. Its not an insurmountable. The real challenge is going to be once its located is recovery. That those depths are very difficult depths to recover from. Its not that you cant do it. It just takes more time and special assets. So let me ask you. Youve talked about all these different situations. Youve done. This you recently just pulled a plane out of the water off the coast of syria, a fighter jet that had been shot down. What do you think this plane is going to look like, especially given the fact that at least at this point, there has been no evidence of debris on the surface . 6. Well, first place, i would be absolutely surprised if there was any debris floating on the surface in the search area right now. Thats long gone. This has been a month. Thats been carried away. Weve had typhoon go through that area. I would not expect any debris on the surface. So im not really focusing on that right now. Im focusing on the pinger from the black box. Its not moving. And its really going to tell you where it is. Also, if there is two pingers, lets say in earlier reports we heard they were picking up both pingers, and that both pingers were a distance apart that means that the plane fragmented. To get two pingers a distance apart that is greater than the length of the airplane means that its busted up. There is some good news if there is any good news in this kind of tragedy is that the more fragmented it is, the easier it is to find. So what well want to be listening to, are they hearing two pingers . Two distinct pingers . Whats their distance . Thats what theyre going to do right now until they finally run out of battery power. They know what theyre doing. These guys, im watching them. Theyre pros and theyre following the book. So im very confident you have the best people in the world on the game. Interesting you think it broke up. Bob is going to be with us later on in the program. Because we want to talk about the other problem here which is they have no idea what it look likes underneath the surface here. There a Mountain Range . I mean, its pretty incredible we dont know. Outfront next, though, breaking news continues. The two new signals bob just mentioned, possibly from flight 370. So how is each signal helping out on the search . That crucial triangulation and special investigation out front. Plus, were going to go to the deepest depths of the ocean and show you how an underwater drone would be used to find 370. And a teen armed with kitchen knives today. A shocking story. We are learning new details about the suspect tonight. Well be back. Sfx car unlock beep. Vo davids heart attack didnt come with a warning. Today his doctor has him on a bayer aspirin regimen to help reduce the risk of another one. If youve had a heart attack be sure to talk to your doctor before you begin an aspirin regimen. To truck guys, the truck is everything. And when you put them in charge of making an unbeatable truck. Good things happen. This is the ram 1500. The 2014 motor trend truck of the year and first ever backtoback champion. Guts. Glory. Ram. Bob will retire when hes 153, which would be fine if bob were a vampire. But hes not. Hes an architect with two kids and a mortgage. Luckily, he found someone who gave him a fresh perspective on his portfolio. And with some planning and effort, hopefully bob can retire at a more appropriate age. Its not rocket science. Its just common sense. From td ameritrade. Its just common sense. When folks in the lower 48 think athey think salmon and energy. A, but the energy bp produces up here creates Something Else as well jobs all over america. Thousands of people here in alaska are working to safely produce more energy. But thats just the start. To produce more from existing wells, we need advanced technology. That means hitech jobs in california and colorado. The oil moves through one of the Worlds Largest pipelines. Maintaining it means manufacturing jobs in the midwest. Then we transport it with 4 stateoftheart, doublehull tankers. Some of the safest, most advanced ships in the world built in san diego with a 1 billion investment. Across the united states, bp supports more than a quarter million jobs. And no Energy Company invests more in the u. S. Than bp. When we set up operation in one part of the country, people in other parts go to work. Thats not a coincidence. Its one more part of our commitment to america. The expedia app helps you save with mobileexclusive deals download the expedia app text expedia to 75309 expedia, find yours breaking news. The search area for missing malaysian flight 370 narrowing dramatically, shrinking 7,000 square miles. At this hour, 14 planes going into the area, 13 ships already aiding the search. Two new signals. This is huge, have been picked up. Officials say this could be from the planes black boxes. You now have four times the signals have been picked up in the same general area. Weve played this for you person after person. No way this could be anything but man made. This is a big, big event. Officials say each new signal is helping them zero in on exactly where it is. Because you say oh we have four in the general area. Just go down there and get it. No. It is not anywhere near that easy, as we have all learned. Tom foreman is out front. Talking about how theyre going to find this, all four search areas within 17 miles of each other. It could mean a lot of things, right . How much closer could these new pings get us in terms of the space . It means you are closer than you were when you had three million square miles. Its not nearly as close as you want to be. Look at how they got to these things. Because its really quite fascinating. This is the big arc described by the satellites that we talked about so much. As you move in on that, you can see the actual path that the ocean shield, that ship followed out here. It looks Something Like a mess. And look at where the pings show up along this path. All four of them there. As i said, it looks like a mess, but its not really. First of all that, satellite path were talking about, it runs right across here. So very close to where these pings are found. And if you look at the pattern they were actually building here, its based upon a grid. The idea is you take the ship in and go back and forth one way and get every hit you can. Then you go the other way and get every hit you can. Then you look at the strongest ones and how they are located toward each other and hopefully what you get out of that is a much smaller box than the big box you started with, erin. Thats what theyre doing now. Thats why they keep doing, this even though theyve had some good pings. All right, so, weve been told at least these pinger signals only travel a couple of miles. How are they getting hits over what seems to be larger distances than that . This is a great question, because i felt the same way, erin. How is this possible this weve been told over and over again it cant happen. Well, the understanding, as were told, is like this. Imagine that there are layers of water in here that are warmer than others. Theyre called thermal climes. If you have the warmer layers than others and create barriers in here, the idea were told by the searchers, people who are involved is they think essentially the signal is bouncing between different layers and just doing odd things. So it may be coming up much further away than you would expect, and it makes it harder to find. This is the kind of thing that happens with radio waves sometimes, and its possible here. The bottom line here is everyone says and they know that sound does strange things underwater. 10 you have a box right now that is about 17 miles long. Overall, youve got about 560 miles search area, square miles. Theyre just trying to crush that down by trying to get rid of the anomalies. Get as many direct signals as they can, erin and then maybe a much smaller box. Tom, thank you. That is why theyre rushing to race against the clock, why what they have now isnt enough. They need more. They need more to get this exactly right. Richard quest joins me along with aneesh patel, president of duquesne sea com. Authorities have confirmed at least one of this pingers was on board flight 370. Theyre saying the signals they picked up are weaker than what they got over the weekend. Now were possibly past the battery life. How much longer do you think the batteries have . Well, we build in a design margin of about 10 . So we think theyre going to go a few days longer than 30. After that, we call it bonus time. The battery is going to start to degrade. It sounds like were in that period right now. So it could be a matter of days. In the lab we have experimented with this under laboratory conditions. We can get a very faint signal out to about 40 days. But again, you got to be right on the top of the unit to hear it at 40 days. And were at 34 right now, richard. So were getting there. Are we going to get enough to triangulate the exact distance . I think we have made the point to people that yes, you may be hearing something, but that doesnt mean you can dive down and look around and its there. Angus houston said last night, the man in charge of the search operation, houston said there is no second chance, meaning hes got to keep the search, the mowing of the sea, as tom foreman was showing, he has to keep that going until he is absolutely certain that there is no battery life left, that there is no pings. A quick question, anish . Yes, of course. How many days would you give it from not picking any pings or any acquisition before you would say with certainty theyre dead. We can put the underwater stuff in, do you think . I wouldnt go much beyond day 40. Right. But if you havent heard anything for two or three days, would you say thats it . Its over. Lets go and put the other stuff in . Thats a fair assumption. Right now theyre continuing to hear pings. Lets see what happens today. But definitely day 40, i would call it quits. And its a good Point Richard raises, because obviously, as everyone you may know when they first heard the signal this weekend, there was a twoday break before they heard the other signal. So that has happened before. Anish, australian figures say we know very little underneath the ocean floor, pretty incredible in general. But a silt, a mudlike substance that is even more thick and solid than mud would ever be could be muffling the signals and causing all parts of problems. Does that worry you in terms of locating them . Well, now that weve got a few more hits, i feel a lot better that we have done or our pinger has done its job in terms of signaling where they ought to be looking. Hopefully we get a few more days out of it to help them narrow this box. And we can do our small part in helping bring some closure to these families. Anish, before we go, what is the pressure like if youre looking at almost three miles under on your little pinger . What is the pressure on that thing . We certify it to 8700 psi. I think its a little less than that here. But its a lot. What is that like . A truck sitting on a bug . Im trying to imagine. Well, weve been able to crush ours at about 10,000 psi, literally crushes like an aluminum can. Wow. Thank you very much. Were going to be back. Richard will be with us as bob ballard comes back as we talk with the ceo of bluefin when they put that down exactly what its going to do. Up next, were going to go into the ocean and show you how that underwater drone could actually acquire, bring up this plane if thats what is down there and actually see what happened and find out the mystery. And chaos and panic at a Pittsburgh High School as a student stabs 20 people. Jake, im in the front door the first hallway in the front halfway down. Weve got multiple victims here. Well need ambulances here as as soon as possible. [ banker ] sydney needed some Financial Guidance so she could take her dream to the next level. So we talked about her options. Her valuable assets were staying. And selling her car wouldnt fly. We helped sydney manage her debt and prioritize her goals, so she could really turn up the volume on her dreams today. And tomorrow. So lets see what we can do about that. Remodel. Motorcycle. [ female announcer ] some questions take more than a bank. They take a banker. Make a my financial priorities appointment today. Because when people talk, great things happen. music defiance is in our bones. Defiance never grows old. Citracal maximum. Calcium citrate plus d. Highly soluble, easily absorbed. Abe get in punch it [ male announcer ] let quicken loans help you save your money with a mortgage thats engineered to amaze. [ male announcer ] let quicken loans help you save your money honestly, im pouring everything i have into this place. Thats why i got a new windows 2 in 1. It has exactly what i need for half of what i thought id pay. And i dont need to be online for it to work. It runs office, so i can do schedules and budgets and even menu changes. But its fun, too with touch, and tons of great apps for stuff like music, cause a good playlist is good for business. I need the bosss signature for this. Im the boss. Honestly i wanna see you be brave and now to our other breaking news story. Tonight a 16yearold High School Student has been charge as an adult with attempted homicide after allegedly stabbing more than 20 people at his school. The school is in murrysville, pennsylvania, about 18 miles outside of pittsburgh. Pamela brown is there. Pamela, what else can you tell us about the suspect and what happened . Well, were learning his name, erin. His name is alex hribel, according to the criminal complaint. He is a 16yearold male sophomore here at the school. These are the charges that he faces. Four cases of criminal attempt, criminal homicide, 21 counts of aggravated assault, and one count of weapons possession on school property. Thats according to the criminal complaint. Right now authorities are going through the computer that was retrieved from his home during a search today, trying to figure out what set him off to come in to school and prompt this attack and stab so many of his fellow classmates. Weve learned from authorities that he had no prior runins with Law Enforcement before. And those that knew him said that he was a quiet student and he kept to himself. So this really has a lot of people baffled. Here is what we do know, erin, from authorities that he walked in around 7 00 a. M. This morning into school. This was before classes started. And he was wielding two Steel Kitchen knives about 8 inches long. And according to witnesses, he just started stabbing anyone that he could find. And this was a period of time where there were a lot of students at their lockers. And so that could potentially be one big reason why so many people were hurt. 24 injuries were told, one adult and the rest were classmates. And also authorities saying that the crime scene was about 200 feet. And it was one wing of the school, a long hallway and several classrooms. Here is what the police chief had to say than. The hallway that was pretty much in chaos, as you can imagine. A lot of evidence of blood on the floors in the hallway. We had students running about, trying to get out of the area. And some of those injuries, erin, were lifethreatening. Some of the students remain in the hospital with critical injuries, although some have been discharged with some minor injuries. A lot of them were at the torso, the lower abdomen, and the back. But i can tell you, just being out here today, this has really shaken up this community. And what about the heroes who stopped the attack from getting worse . This could have been so much worse, i know. This could have been. And we heard authorities talk in the press conference that we probably could have seen a lot more injuries or even deaths if there werent some heroes, some quickthinking people who jumped into action. We learned that the assistant principal here at the school, sam king tackled the alleged attacker. Also, the School Resource officer and a Security Guard known as buzz here at the school also helped and jumped in to subdue the attacker. And we also heard about cafeteria workers, teachers, fellow students coming to the aid of those that were wounded. So certainly a lot of heroes here today. Erin . Pamela, thank you very much. Pamela brown covering that story for us in murrysville. And still to come, the breaking news as investigators pick up two fresh signals that could come from flight 370s black boxes. And dramatically narrow the search area. So the question is how will they actually reach the plane . Well, the company that is going to be doing that is on the show tonight. And the husband of a flight 370 passenger is out front. This is about people and the people on that plane. He is going to react to tonights breaking news. Arrhea, bloating . One Phillips Colon Health probiotic cap each day helps defend against these digestive issues with three types of good bacteria. I should probably take this. Live the regular life. Phillips. [ male announcer ] when fixed income experts. Work with equity experts. Who work with regional experts. Who work with Portfolio Management experts, thats when expertise happens. Mfs. Because there is no expertise without collaboration. And let in the dog that woke the man who drove to the control room [ woman ] driverless mode engaged. Find parking space. [ woman ] parking space found. [ male announcer ]. That secured the data that directed the turbines that powered the farm that made the milk that went to the store that reminded the man to buy the milk that was poured by the girl who loved the cat. [ meows ] the internet of everything is changing everything. Cisco. Tomorrow starts here. More of our breaking news tonight on the disappearance of flight 370. Officials zeroing in on what could be the missing malaysian airliner. They have just moments ago right before this program slashing the size of the search area, and they say they have identified two more sets of pings. That brings it to four total that they say they believe at this point is from that planes black box. The latest developments mean investigators could be just days away from taking the search to the next level, which means going under the water and trying to find what is there. Our rosa flores begins our coverage on this with a first look at that search. Reporter four times investigators have heard pings that are consistent with the signals coming from the missing jets data recorders. I believe were searching in the right area, but we need to visually identify aircraft wreckage. Reporter thats where this probe comes in. It was sent to the indian ocean to scour the ocean floor. Its called an auv, an autonomous underwater vehicle. And it uses side scan sonar. You can see it right here, to create that picture. It he is also equipped with a gps system. You can see it right over here. And of course, that lets the crew know where this probe is at any point in time. It has been used before to identify and help recover plane wreckage. It would be able to narrow the debris field. For demonstration purposes, its tethered. That would not be the case, of course, in the indian ocean. Once this launches on to the water, youre going to see it kind of floats. Its buoyant. Our particular auv has about a 20hour endurance. To get down to a depth of 4500 meters, it takes about two hours. This is an auv made by bluefin robotics as it searches underwater. Its the same auv that is in the indian ocean, ready to dive more than 14,000 feet in search of the mission 777. This animation shows how it moves along the ocean floor, as if it were mowing a lawn, creating a map of potential plane debris. The auv is also equipped with a still camera, essential to the search. So once we get a debris field, well have the auv run a pattern over the debris field with photographs, and that will pretty much identify the airplane for sure. Are you getting the signal on the beacons as well . Reporter if they fight flight 370, this remotely operated vehicle, an rov, can retrieve the black boxes from the ocean. You put your two cameras here on our pilot monitor and your copilot monitor. Reporter the rov can operate in the deep sea where humans cant, and may be the only chance of recovering the flight data recorders and any evidence of what happened to mh 370. Rosa flores, cnn, new york. All right. David kelly is the president and ceo of bluefin robotics. Good to have you with us, sir. Appreciate it. As you know, right now theyre still searching with the towed pinger locators. But those only hear a black box. Your bluefin can see a box, see the wreckage. When it is time to put the bluefin in the water to answer the question of whether this is the plane . The bluefin can search about 40 square miles a day. And so the appropriate time would be when they had narrowed the search area enough that that coverage would give them data that they need to resolve the mystery. So it sounds like youre saying a few days away, if they were to continue to acquire the signal and triangulate more, you would still wait a few days . The people on the site, we salute their efforts in trying to resolve this mystery. Phoenix international that owns the bluefin 21 has done multiple of these types of missions. They know what theyre doing, and i trust their judgment on when to put the vehicle into the water to conduct the search. And what about whether how deep it can go . I know at least the specification says 14,763 feet. But obviously, the ocean at this point could be a little bit deeper than that. Its not fully mapped. So they dont know. I know any change in depth at that far below the surface, it could be an incredible change in pressure. Is the bluefin able to operate outside its formal range if it needed to . Yes. The bluefin standard 21 that phoenix has is rate to 4500 meters. And as you noted, thats about two and a half miles down. At that depth, the pressure is equivalent to having the weight of a Cadillac Escalade on your thumbnail. Its also slightly above freezing at that depth and its pitchblack. We are looking, following good engineering practice, we do have design margin on that vehicle. Were reviewing the data now to look at any possible extension of the operating depth that the vehicle could be worked at. Stay with us. I want to bring in bob ballard back, the underwater explorer who discovered the wreck of the titan and and our own richard quest. That is understand, the pressure of a cadillac on a thumbnail. Not only the pressure, but its the mechanism by which it has to do it. Untethered, down below, its untethered, its down blow. Its slow. It has to bring its pictures back up again. It then has to be analyzed. So you dont really embark on Something Like this until youre really ready. You dont think oh, well lower the bluefin today to see whats down there. You cant just go down and look around and come back up. Bob, what 00 the what this means . Weve got video of the wreckage of the titanic when you went down there and used these kinds of vehicles, went down there yourself that was 12,500 feet down. About what were look at now. But when you went down, how much did you know what the ocean floor would look like down there, or were you, similar to this kind of situation, kind of going down not knowing what the surface would be like . We had better maps. We actually had a better idea of the terrain that the titanic was lost in. There was a canyon running through the area. So we knew pretty much the topography we were up against. Here, as far as i know, they dont have the kinds of maps that we have when weve done previous searches. And what theyre going to be doing now is trying to narrow the box, but there are also assets not far away that can actually come in and make detailed maps. But i think the point is that this is a very slow process. When youre operating at those depths, the time to get down, the time to get up, we call it the elevator time, can be very long. A couple of hours in this case for this vehicle. But, you know, we have the assets in place for this phase. Well then move to the second phase, then the third phase. This takes a multiphase of operations that quite honestly dependent on where the assets for the next phase are located can be weeks. And certainly, a recovery could be months. So david, what about in terms of what its going to be able to see if it goes down . Lets assume you get to the point you know youre in the right place. The bluefin goes down. Its looking around. Theyre saying in terms of what they do know, which is very little here, there are so many things we dont know. But there could be hundreds of feet of silt at the bottom of this. Just, i mean, thats an enormous amount. Youre going to be able to see through that, see whats there wreckagewise . The bluefi 21 sonar payload that is on this particular vehicle has three different sown arrest in. It has a side scan sonar which provides imagery of the bottom, can cover roughly a little over half a mile in swath. It has a multibeam echo sounder, which will give depth information. You also can do some coarse imagery. And depending on the bottom time, it can see some depth into the sediments on the bottom. So, richard, all the reporting you have been doing in terms of what is down there, if the plane is there, this issue of being no debris on the surface, you heard bob ballard. It makes total sense to him with the typhoon and the time that has happened that there is no debris no matter how this plane went under the water. But this whole question people have asked of whether its intact or how many pieces its in. Do we have any information or any guesses about that . No, we dont. The experts are telling me that bearing in mind what we know so far, that there is a realistic possibility that it is in major pieces. Okay. Note im not saying they dont know, right. Im not saying its intact, its all sitting there on the bottom of the ocean. But it could be in major identifiable looks like a plane. Okay. Now what about this issue of the black boxes themselves . Because everyone keeps saying, they record over themselves. So every couple of hours, the cockpit voice recorder. If someone in that cockpit, whoever it was, pilot, crew, whoever else was in that cockpit, was in charge did this on purpose, it is possible that they didnt want anyone to ever know and youre going hear two hours of silence . Its not possible. Its highly likely. Unless the plane so what im saying is you could find this plane and this mystery of why this plane is there may not be solved . No. Because you will get sufficient information from the flight data recorder about the implements and the instruments and who was doing it. You may not know who is doing it, but youll know what was being done. Bob, what do you think about this issue . Again, for our viewers just joining, bob not only found the titanic, he brings planes up from underwater. He recently brought up fighter off the coast of syria that had been shot down. Assuming if that is the case, didnt want us to know what happened, that we would be able to find out from those recorders . Well, the first place, he certainly picked the best place to hide his plane. I mean, it looks like this individual was actually going out as a way to hide the plane. But we can find it. And im very confident. I dont think the silt issue is an issue, you know. Ive like i said, ive seen debris fields from the thresher and the scorpion where they drop nuclear reactors. So yes, the very, very heavy objects will go into the bottom to some degree. But engines, for example, from the turkish phantom 5 were sitting right on the surface of the ocean. You couldnt have had a heavier object hit a soft bunch of mud. So i dont think this thing is buried. Certainly the fact that you can hear the pinger, its not buried. So i think youre going to find a large debris field. Youll be able to figure out by its density where things are. And you slowly collapse it, collapse it, and collapse it. And then you finally set up shop. And when you set up shop in 15,000 feet of water, its not that big an issue. The big issue is how much of this airplane do you want to bring up. And how do you bring it up . Thats the other question, right . Its not like you can just stick a crane down three miles and bring it up. There is all sorts of recovery devices. It also depends upon how big the objects are. I think theyre going to obviously want to get the black boxes. That should not be difficult. Its a question of how much of this plane do you bring up to reconstruct it to understand what happened. And that all going to be on what you finally end up encountering. I suspect there are some very, very large pieces. I would have i would be surprised if there is an intact airplane sitting on the bottom of the ocean. But we have found intact airplanes sitting on the bottom of the ocean. So until we can collapse the box, until we can actually get into the debris field, there is a lot of possibilities. But the good news is i think were going to home in on this guy. David, quickly, before we go, what level of detail can you see when you go under . You see big objects. Are you going to be able to see what it looks like on that plane, the seats, all the detail . There is three different sensor resolutions that would be involved. In the first broad area search, the objects that could be detected would be about a meter in size and larger. And its also important to remember when youre looking in a sonar image, youre looking at sound waves imaging an object, not light. Understood. And so the objects will look different than when you look at a camera. There is a higher frequency sonar that then can be deployed that can see objects about a half meter and larger. And then there is the High Definition black and white camera, which would see obviously optical level of resolution. All right. Well thank you very much to all three of you. And still to come, more on the search for flight 370. The families with this development. What do they think . Were going to be joined by the husband of someone on that plane. And Oscar Pistorius in his own words with a tearful defense. To truck guys, the truck is everything. And when you put them in charge of making an unbeatable truck. Good things happen. This is the ram 1500. The 2014 motor trend truck of the year and first ever backtoback champion. Guts. Glory. Ram. 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We take care of the heat, so you dont get burned. Just another way we put members first, because we dont have shareholders. Join the nation. Nationwide is on your side i want to check with anderson to see what is coming up on anderson 360, breaking news on two fronts. Tragedy and heroism at a high school outside of pittsburgh. Youre going to meet gracie evans who helped save a friends life after he put his on the line standing between gracie and the suspect who stabbed allegedly more than 20 people in the school. Also, four signals now in a 17mile area. But there is still no confirmed debris in the surface. Still no visual sighting under water. Well keep with commander William Marks aboard the u. S. Navy command ship, the uss blue ridge. And well take you down to depths of the ocean floor. This is what it looks like 9,000 feet down in the area where search em where efforts are centered. Gary tuchman shows what researchers are up against a anderson, see you in just a few minutes, and our breaking news continues on the missing malaysian flight 370. As i mentioned the search crews are zeroing in on the wreckage, what they believe could be the wreckage, they reduced the search zone by 20 in one day after locating two more signals that could be pings on the black boxes. But for families that are waiting, they want the answers, the truth. But do they really want this to be the plane . It could finally provide a bit of closure for some. This mans wife was on her way to a u. N. Conference in mongolia. Tonight, i searched around to see if they found the plane. If it is the plane indeed, then i suppose the last word is more or less not too far off. And one has to accept the reality and the finality of the goal. That things have come to an end. And if it is not the plane it is equally difficult and equally traumatic, because then the wait just continues for much longer, and i dont know if that is any better. So either way i think from a personal standpoint it doesnt take away the the pain. The waiting. The agony of simply not knowing. And the what shall i say . The extreme difficulty of the continued actions of somebody who is very much an integral part of ones life. And when chandrika and you had a wonderful life together, you said the last time you spoke, you were very pragmatic about what happened. And now we could be days away from learning if it was the plane, and you said look, i dont know if it is or if it isnt. And you wanted an answer, are you really prepared to hear the answer . This year would have been the 25th year of our marriage, yeah, so we have been together 25 years in married life. So it has been a long time. And so it is a little hard to imagine what life might be in her absence. If she is forever gone. And at the same time it is hard to imagine what it would mean to actually claim her if she is indeed at the bottom of the ocean. And i dread the prospect of having to go to the court and go through some process of identification. That is the part that is quite dreadful and i cant imagine what that might be. So i cant imagine what i really wish to look forward to in any case. And do you think you will ever get the answers about what happened . My belief is that eventually well get around to that. But it is going to take a while. It is going to take us a long time. And it is going to require a lot more people to become a lot more candid up front and forthcoming with what they know already and what they discover in due course of time. And you talked about how this would have been your 25th anniversary with chandrika. And her birthday was march 30th, which you had to commemorate without her with you. What are you going to do to honor her life and celebrity your life together . 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[ scott ] feed your lawn. Feed it. The expedia app helps you save with mobileexclusive deals thanks scott. Download the expedia app text expedia to 75309 expedia, find yours a tense day of testimony as Oscar Pistorius took the stand for a third day. The prosecutions chance to grill the onetime olympian, robyn curnow out front again in pretoria. To tell the truth as i can on that night. Reporter Oscar Pistorius undergoing a gruesome cross examination during his third day on the stand. I took reevas life. You killed her, you shot and killed her. Who will take responsibility for that . I did, my lady. Then say yes, i shot and killed reeva steencamp. I did, my lady. The olympic runner says the shooting was an accident, but the prosecution says it was murder. I shot because i was at that point, with that split moment i believed somebody was coming out to take me. Prosecution showed a video of pistorius shotting a watermelon just months before. You know the same happened to reevas head, it exploded. Things quickly became heated when the prosecution asked Oscar Pistorius to look at a crime scene photo of reevas head. I will not look at a picture where im tormented. I dont have to look at a picture. I was there. The prosecution accused pistorius of not answering the questions directly. My lady if i was sitting here and thought of every implication of what i say, it would be reckless, my life is on the line. But reeva doesnt have a life anymore because of what you have done. At the end of the day, Oscar Pistorius said he didnt think before he shot. The state will respond that they will prove he was lying. Robyn, thank you. And president obama and the first lady in fort hood to pay tribute to the three People Killed in last weeks shooting rampage. To the parents of these men, as a father i cannot begin to fathom your anguish. He spoke about each soldier who lost his life. Staff sergeant carlos lazany rodriguez, came from a close knit family from puerto rico, during the almost 20 years of Selfless Service he earned numerous decorations including the combat action badge. And on april 2rd, he was just months away from retirement. Sergeant Timothy Owens was from eppingham, he became a black belt and taught martial arts before joining the army in 2004. Sergeant first class Daniel Ferguson grew up in smalltown mulberry, florida, in high school he was an outstanding athlete. Sergeant ferguson died a hero. He was shot as he held a door closed to protect a roomful of other soldiers. He put himself in the line of fire to save them. All three soldiers were fathers, all three had served tours in kuwait and iraq. These men and their families are in our thoughts. Anderson begins now. Good evening, tonight searchers get closer to finding the wreckage of flight 370. Late and significant new developments ahead. But first, breaking news, the heroes emerging in a high school, where a sophomore will be charged as an adult. The elements this time of the 16yearold suspect we are not naming, two kitchen knives and five minutes of terror. My best friend stepped in front of me and he got stabbed in the back. And then in 30 seconds, i saw three people get stabbed. She helped save the life of one