zealand. at eight months old, he is traveling with the duke and duchess of cambridge, mom and dad to him. not really your typical play date. >> very cute baby, a roomful of cute babies, could watch that all day, susan, thank you very much. that does it for us, be sure to -- thank you very much for watching. >> i'm rosemary church and i'm errol barnett. the search for flight 370 is becoming much more focused and narrowed. the time to find the aircraft's black boxes may quickly be running out. >> also ahead -- >> i saw people running and screaming and crying. >> 20 students are stabbed after a teenager goes on a rampage through his u.s. high school. why authorities believe this attack could have been much, much worse. >> and coming up later for you, here on cnn newsroom -- >> you killed her! you shot and killed her!

won't you take responsibility for that? >> the prosecutor there grilling oscar pistorius during day one of cross-examination. but could that strategy end up backfiring? we'll preview thursday's session, set to begin in just a few hours. >> the search for malaysia flight 370 grows more intense with each passing day. two underwater pings heard tuesday have authorities optimistic that the plane missing now for 34 days, may soon be found. >> we want to show you the latest map from search headquarters in perth. take a look, it's on your screen now. the operation now covers some 58,000 square kilometers, about 22,000 square miles. >> all suspected signals came from the same general area and in line with the missing plane's

estimated flight path. but the latest sounds were weaker, raising concerns that the beacon's batteries are perhaps dying out. >> in addition to the search beneath the surface, there's a visual search going on as well. 13 ships and 14 planes. officials are hoping the field can be narrow to take a closer look. >> let's get the latest now. er erin, it's just after 1:00 in the afternoon there in perth. what's the latest on this search effort today? >> as far as we know, the ocean shield, equipped with the american towed pinger locator, still combing the waters, trying to detect any further pings. of course the more pings they're able to acquire, the more information they have on the potential signal source. so they say they're going to keep doing this until they're

absolutely certain that the battery has completely run out. as you mentioned on tuesday, the signals they detected, noticeably weaker than the signals detected on saturday. now, it's also interesting to note that one of our producers taking a look at at marine traffic monitoring website noticed that the british vessel, the hms echo was moving in the direction of the ocean shield. we reached out to authorities here in perth for more information on that. we have been unable to confirm officially those movements so far. but it's interesting because that british vessel is equipped with mapping technology that's able to map the seabed floor. so it will be interesting to see if in fact is moving towards the ocean shield, what it will believe doing if and when it does get there. >> of course because there's been much chatter about when that part of this search process will get under way. but of course the pinger locator, as you say is in the

search area, trying to reacquire a signal. and the search for debris is taking place to the west of there. talk to us about that effort. >> that's right. some 14 planes and 13 ships continuing to scour the waters for any signs of plane debris. they're now looking in an area that's based on a current analysis, using the information they've been able to acquire from the believed flight path, as well as from the pinger locations detected by the ocean shield. they've been able to narrow down that search area to less than a third of what it used to be. some 22,000 square miles. but officials saying that by narrowing down that search area, they're able to take those assets and intensify those efforts, but no signs of the plane so far. >> all right, erin, thank you very much. well, the ship that picked

up those underwater signals on saturday and tuesday is carrying a u.s. navy pinger locator as we've heard and been reporting on. >> this really is a key piece of technology because the more pulses investigators can detect, the more they'll be able to narrow down and zero in on flight 370's locator beacons. >> joining us now, commander, thank you very much for your time. first, walk us through what specific mission your team is involved in today. >> sure, as you know, on the ship, we have the two initial detections, one for the long period of two hours. then of course on the eighth, another four-minute stretch and a seven-minute stretch. so now the question is, where do we go from here? so, there are a couple important points to remember. first, that this is a very deliberate, methodical operation, so it's not like

we're just going to throw the bluefin in the water and find this thing tomorrow. what we want to do is maximize the time that may still be left on those black box batteries. so we're going to keep searching with the towed pinger locator. right now, we've done an incredible job to decreasing the search area to a small, defined area. but for a side-scan sonar that works slowly and methodically, it's still pretty big. so we want to keep listening for the black box pings, hope to narrowly define that area just a little bit more and then we can start searching with our active side scan sonar. so the priority is to keep the tpl in the water, see if we can get some more detection on that, and then after we think the batteries are exhausted will we start searching with the bluefin side-scan sonar. >> and commander, i wonder if

you could just explain to us how you're coordinating with the malaysian navy right now. >> the joint task force has been set up by the australian government. so it's a coordinated effort. our personnel are in support of those two entities. so the important point to remember, everything we do is in support of this coordinated effort. so, for example, what search sectors to search in, the acoustic analysis. excellent work being done by an australian center to determine the strength of the pings and where they're coming from. weather analysis, so the u.s. role from here in the 7th fleet, it's our equipment, but we are in a supporting role of both

those governments. and it's a very tight-knit, close, collaborative process. we talk to each other every single day. and everything we do is in sync. >> commander, talk to us more about that coordination. it's not just the u.s., australia, china, british vessels there as well. do you collect the information and then send it to perth, or do you allow the working group to make sense of it? >> on the ocean shield, that's the vessel carrying the tpl and the bluefin, those folks see video. they're actively looking at the sensors. it's a continuous, 24-hour operation. active duty u.s. navy civilians and australians on board. as that data comes in on scene, they analyze it the best they can. you have to remember, it's very

advanced software that goes with this equipment. this ping normally is not audible by humans. it's not just something that you can listen and hear it with your ear. so the software actually does a lot of processing to create the picture and audible signal that they here. so the folks on the ship do the audio processing and then send that data off to the headquarters. and from there, it's a team effort. >> thank you for joining us, we appreciate it. >> one of the most puzzling aspects, after more than a month, not one piece of debris from the airliner has been recovered. but searchers from several nations are still looking. our matthew chance filed this report after taking off with a new zealand flight crew as they scanned the sea. take a look. >> the search for any sign of

malaysian 370. we flew to a remote corner of the indian ocean, where it's estimated the currents may have carried debris of the missing plane. it's like searching for a needle in a thousand haystacks. >> -- over a thousand miles -- [ indiscernible ] -- it's a pretty remote part of the planet, that's for sure. >> with no land for a thousand miles, one of our engines is switched off, a way of preserving fuel, we're told. then the search of a patch of this vast ocean resumes. all right, we've descended to well below the clouds, so low, in fact, just a few hundred feet from the surface. we've been asked to put on these life jackets in case we accidentally ditch into the sea. so for the next five hours or so, we're going to be

chris-crossing this desolate, virtually empty part of the indian ocean for any sign, any wreckage, anything at all that could be linked to flight 370. on board, this sensitive radar and optical equipment, being closely monitored. but the hunt for 3 sencht is a painstakingly manual search. the crew take 20-minute turns to scan the waves below. >> okay, we've been circling around. descended to a much lower level and we found something. >> yeah, we found two objects. two are small and white, not significant. one seems slightly longer, orangey, we'll go through the procedure to acquire it. and we'll assess them as to whether he tell them immediately. and that's pretty much the captain and the coordinator's decision as to whether it's significant. >> it wasn't, the captain said. just more junk floating in the

sea. >> let me ask you, we've been looking for this plane since march 8th, and you've been a significant part of that. firstly, thank you. are you frustrated that nothing has been found? >> i wouldn't say frustrated. we are just -- [ indiscernible ] missions of this nature, from my experience, take time. >> and more searching by air and sea to solve the mystery of flight 370. matthew chance, cnn, over the indian ocean. >> well, we are going to continue to follow developments on the missing plane throughout the hour here on cnn newsroom. but first, after the break, we'll check on some other stories we're watching this hour. a 16-year-old boy accused of stabbing nearly two dozen of his classmates. we'll hear from students who witnessed the attack first hand.

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gathered to pray for those injured in the attack. no one knows yet what sparked this rampage. cnn's pamela brown walks through it. >> this teenage boy behind the terrifying rampage today. a five-minute alleged spree of stabbing and chaos at his pennsylvania high school. >> i was walking over towards the exit and there was blood all over the floor. thought maybe someone had a nose bleed or something. and someone yelled she got stabbed. >> officials say 16-year-old alex hribal used two kitchen knives. >> he's a nice young man, he's not a loner, never been in trouble, he works well with other kids in school. >> no immediate word on a motive. fbi agents were seen at his home following the attack. >> the suspect's computer is being confiscated. as far as i'm told, the subject did not have a cell phone.

>> the sophomore was arraigned this evening, charged as an adult, accused of four counts of criminal attempt to commit homicide, 21 counts of aggravate assault and one count of possession of a weapon on school property. the carnage began shortly before the start of classes wednesday when hribal began stabbing students in a crowded hallway and went from classroom to classroom. a fire alarm was pulled and that helped get people out of the school. >> i can tell you what we saw when we got there, it was a 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. >> investigators say an assistant principal tackled the team and the school resource officer was able to handcuff the suspect. >> there are a number of heroes.

students who stayed with their friends and did not leave their friends. cafeteria workers who automatically just reactively began caring for students who were bleeding. teachers and teachers aides who pulled students out of the hallways and into rooms and began applying first aid and protecting those children. and then, obviously, the school resource officer. >> the suspect, 16-year-old alex hribal, charged as an adult on four counts of criminal intent to commit a homicide, and 21 counts of aggravated assault. in court on wednesday, the magistrate denied bail for him. his defense attorney asked for a psychiatric evaluation for him. also interesting to note, his parents were not present during the arraignment.

oscar pistorius is due back on the witness stand in just about two hours in a south african court. he's expected to face more tough questioning in his murder trial. robyn curnow has more now on a contentious day of cross-examination. >> this is the video shown by the prosecution in his first day of cross exam iping oscar pistorius. the olympian shooting water melons at a gun range, yelling, then saying it's a lot softer than brains. the defense called the court presentation an ambush, evidence they say they weren't privy too. the judge allowed it and then the prosecutor took everyone by surprise. ordering a graphic photo of a dead reeva steenkamp on every courtroom screen. >> i'm going to show you, mr. pistorius, it had the exact same effect, the bullet that went into her head. >> forcing pistorius to look, to

compare the water melon to steenkamp. >> my lady, i was there that night. >> have a look, i know you don't want to but it's time you take responsibility for what you've done. >> and in doing so, may have overstepped. >> it's a valid strategy to unsettle the defendants so they get tripped up on the stand. >> earlier pistorius was on the stand for the defense. >> i had her head on my left shoulder and i could feel the blood was running down on me. >> pistorius detailing the moments after he shot and killed his model girlfriend reeva steenkamp. >> i was shouting and screaming to help me to get her to the hospital. >> he said he desperately tried to save her life. >> i had my fingers in her mouth to help her to try to breathe.

>> the defense making oscar pistorius meticulously recap, minute by minute. >> reeva already died whilst i was holding her before the ambulance arrived, so i knew that there was nothing they could do for her. >> the amputee discrediting expert testimony who said he did not have his prosthetics on when he broke the bathroom door down with a cricket bat. >> i can barely stand on my stumps let alone wield a bat. >> the defense trying to discredit his testimony, discussing neighbors the prosecution never called to the stand, who say they never heard a woman's voice that night. >> she heard loud crying and not a woman screaming. >> pistorius continuing to proclaim his innocence. >> i did not intend to kill reeva my lady or anybody else for that matter. >> it was a tragic mistake, says

pistorius who battled a prosecutor who was determined to prove it was nothing less than premeditated murder. >> you made a mistake? >> that's correct. >> you killed a person, that's what you did? >> i made a mistake. >> you killed reeva steenkamp, that's what you did. >> this aggressive cross-examination will continue on thursday. pistorius said he did not think before he shot. but the prosecutor said, we will show you, you are lying. >> and cnn will take you live to pretoria when oscar pistorius returns to the witness stand later today. again, that's expected to happen in a little more than two hours from now. we are going to return to our top story after this short break, the missing malaysian airliner. >> coming up for you, the science behind the ever narrowing search zone. closed captioning brought to you by franklin templeton

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welcome back. want to check the latest we have on the search for malaysia airlines flight 370 now. 13 ships and 14 planes are searching the indian ocean west of australia today, looking for clues in the plane's disappearance. the search area covers about 58,000 square kilometers. >> now, this search area, as well the australian vessel, ocean shield, has picked up four underwater signals, believed to be from the plane's cockpit voice and flight data recorders,

the so-called black boxes we've been talking about. >> search leader angus houston says he's optimistic the plane will be found soon. now even though it still covers a vast area, the search zone has narrowed dramatically. each time search teams pick up the pings, or possible beacon signals, it helps them pinpoint the potential location of the wreckage just a bit more precisely. tom foreman explains. >> reporter: the way that they have developed these new pings has really been quite fascinating. take a look at the ark here that came from the satellite hits sometime before. look at what happens when we move in to where the ocean shield was following this exact path. now, it looks like a hodge podge here, but this is what turned up those pings and put them in this area, which is really right alongside where that satellite track was running. looks like a mess, but in fact, there's a real plan here.

what they do, they try to establish a grid, by going back and forth with the ship, getting as many pings as they can. then they go the other way and get as many things as they can that way. if this all works properly is the strongest pings cross referenced from two different lines, this way and that way. and that helps them define a smaller search area. that's why they keep working. they want to get as many pings as possible to try to narrow this in, because the better job they do here, the better luck they're likely to have when they finally go beneath the waves, where it's much harder and much more time consuming. >> all right. as we told you earlier, the search efforts are occurring from the air and sea. and our meteorologist joins us with more on the conditions in the region. how is it looking? >> we have some winds headed in this direction after a couple days of tranquil weather.

tom really pinpointed what's happening in this region as we narrow down the search zone. the temperature in perth, 88 degre degrees fahrenheit, but the perspective as far as the search zone, the old search areas, remember, that wthat was equivalent to 2/3 of the united states. now it's equivalent to something the size of west virginia. you see the areas, we have a sonobuoy occurring in this region and also in the western search zone. but the perspective as the orion cruises the above the water, the ocean shield, the ping detection happening right there at the surface as well. and we have the sono buoys that we talked about, markers that

have been dropped into the ocean. the conditions beneath the see very important. this was the pesky storm system that brought in low clouds toward the southern end of the search zone. we like to see high pressure build and that's what's going to try to happen in the next couple days. but it stays far enough south to have some clouds in the region. notice the southern tier of the search zone is where the clouds are isolated and the winds want to pick up 12 to 15 miles per hour. nothing as strong as what you would see across the southern perspective as well. some thundershowers also in the forecast, popcorn showers i like to call it, because you can see the isolated nature of them. but any of these storms could play a significant role impacting the storm at the surface. beneath the surface, we know the search area is somewhere 12,000 to 19,000 beneath the surface. the titanic was found at 12,500. we have the alvin out, down to

14,700 feet. so the region we're detecting the signal from is between 13,000 and 14,700 feet. so it's really in the bottom regions of anything ever found that was quite significant by people. so this is going begin an undertaking here that a lot of work has already been put into, guys. >> what impact do you think the weather will have on the operations there with the pinger locator? they could still find the signal, despite the weather pattern? >> yeah, the storm could churn up the ocean a little bit. so any motion with that will make it a little more challenging with any signal left in place and that's the key to triangulate where this device may be, the black box recorder out there. so that's of course something that a lot of people are looking at carefully, the water surface. >> good to know. many thanks to you. >> you bet. and still to come here on

cnn newsroom, which do you think would be harder to find in the ocean, flight 370, or the titanic? >> if you look closely at the map, you may know the answer to the question. coming up, we'll ask someone who was involved in the successful search for that infamous ocean liner.

>> we want to once again welcome our viewers in the u.s. and around the world. i'm errol barnett. >> and i'm rosemary church. thanks for joining us. >> i want to bring you the latest on the search for the malaysian jet liner. the two underwater signals have led authorities to narrow their

search area once again. >> let me show you this map. now the area covers 58,000 square kilometers now, what's especially encouraging is that all four pings detected since the weekend were picked up in the same general area. and in line with the missing airliner's latest estimated flight path. >> now, this is still a massive effort. today's operation involves 13 ships and 14 aircraft. keep in mind, they're still covering an area that's twice the size of belgium, or for those of you in the u.s., roughly the size of west virginia. >> search leader angus houston says he's optimistic, the jet liner will soon be found. >> relatives of those on flight 370 have been following the search. more on that from beijing. one of the things we have to mention, it's been more than a month now, beyond the heart break, a lot of these families

are in a financial limbo as well. >> yeah, that's right, errol. we're talking about 154 people on the plane that are chinese citizens and many of the families are here and they've been here for the past 34 days, and even though their lives are on hold, they still have daily responsibilities that we all have. they have to pay their bills. they have to pay their rent and their mortgages. so the question is, what happens to the bank accounts of the passengers on board? many of those passengers were the breadwinners of these families. well, that is one financial stress that the families have had to deal with, and that's been brought up to the chinese government. now the government has offered to help. they have said, if you're in some sort of a dilemma with your bank, let us help you. fill out these forms, give us your personal information, and then the government has been stepping in to work with the banks to try to accommodate

these families. so, errol, the dilemma here for these families is that no plane has been found. they don't have any sort of documentation or any piece of paper to explain what has happened to their loved ones, that they can show to a bank or to a landlord. >> and they still have to deal with all the bureaucracy anyway. you can imagine how much more difficult it is for them considering they still don't know what happened to their relatives. how are the relatives holding up? >> well, they're here today. they're meeting informally. this is what they've been doing every day, of course every day is filled with so much pain. but it's a little bit easier because they're with each other. they all say they find strength from being with each other. i was inside, talking with the

relatives. they're in that memorial room where we've seen some of the handwritten notes on the wall. several of them were gathered around a laptop. several of them were just talking. several of them were behind closed doors just discussing. i know the family committee has talked about trying to reach out to some of the other countries who had passengers on board. even though most were from china, some of the passengers were from the u.s. and australia, new zealand, as well as india, so there's this effort to try to contact them to bring them into the fold. errol? >> from beijing with the financial and emotional strain with the relatives of passengers on flight 370. >> if the worst fears are eventually realized with solid confirmation that flight 370 did crash into the indian ocean, getting to the wreckage will be very difficult. one reason, of course, the treacherous terrain of the ocean

floor. but as we report, another is the depth of the ocean itself. >> plunging to nearly 15,000 feet below sea level is a journey into a mysterious abyss. a journey few humans can even comprehend. the boeing 777 is about 200 feet wide, 242 feet long and possibly so deep under the indian ocean that you'd pass the statue of liberty, the eiffel tower and the tallest building in the world on the way down and still be only a fraction of the way to where the plane wreckage might be resting. keep plunging and you've entered a place sun light can't reach. the pinger locator is being towed below that. at these depths, marine life is unlike anything most people have ever seen. >> the deeper you go, you find less and less. they have to be cold tolerant. they might not even have eyes. they may be blind because they don't need to see. there's no light down there.

>> keep going toward the ocean floor, and at 12,500 feet below sea level is where you'd find the wreckage of the titanic, where it still rests today. if it were turned upside down at 14,400 feet is where you'd hit the iconic peak of washington state's mt. ran ear. only after that, you would reach the spot where the pings are coming from, 14,800 feet into the abyss. if that doesn't capture the magnitude of this search, imagine what one oceanographer described for us. picture yourself standing on top of one of the highest peaks in the rocky mountains looking all the way down and trying to find a suitcase, in the dark. >> got a lot of failures here. >> only a handful of people have traveled to these depths and beyond. one of them is movie director james cameron. using a state of the art vessel,

he dropped 35,000 feet, seven smiles to the deepest place on earth. he's turning the scientific mission into a movie. >> that need to see what's there, beyond the edge of your lights, to see the unknown for yourself. >> the pressure at nearly 15,000 feet is crushing. and very few man submarines can even withstand it. >> there are only half a dozen subs that can go to basically half the ocean depth, with a number of countries having that capability. it gets to the point of collapse. it basically implodes. it just crushes. >> finding the plane is daunting. bringing it back from the deep, even more difficult. >> now the best clues right now for searchers are those underwater pulses that were picked up by the australian naval ship, the ocean shield. >> yeah, jewels javi is a research oceanographer with the

scripps institute of oceanography, he joins us via skype from san diego, california. of course, it's worth pointing out that you were involved in the search for the titanic. i'd be interested to get your perspective on comparisons here between the search for the titanic and of course flight mh370. >> sure, thanks for the invitation. it's a pleasure to be here. well, i think for the titanic, we had a much better idea where it was. as you may recall from reading the stories, there were a number of ships that arrived on the scene. we didn't quite at gps that we have today, but the navigation was good to within, i would say, a couple miles. so imagine you have a 30 kilometer, by 30 kilometer uncertainty in finding the titanic and that's something on the order of a thousand kilometers. what we have here is more like 58,000 kilometers of uncertainty in finding this shipwreck. so the task is much more difficult. >> now, jules, you were saying

earlier to our producers, that you think there's only a 50/50 chance that these pings that have been detected and are narrowing the search zone to drop the submersible eventually, what else could these pings have been? >> well, there's a couple of -- well, i don't want to come off as a huge cynic, but the media that i've been seeing is produced by a number of the news media. if they're seeing the pings that are 16 miles apart, and we know, for instance, that the operational range of the sonar is on the order of a couple of miles, then i can't resolve why they're hearing those pings so far apart. i don't think there's a lot of other stuff that would have that frequency. some of the marine mammals, it could be other man-made devices around that we just don't know about. but i would agree with you there's a small uncertainty in the actual recognition, but this

disparity between their operating range and the ranges at which we're hearing them, seems to be uninterpretable for me. unless, the possibility, we know there are two boxes and the other possibility is that maybe it's not sitting on the sea floor. maybe it's somewhere in the water column and it's being moved by currents. >> it's drifting around? >> these are possibilities. >> another point that you raise which we found very interesting, you're saying the weakening of the signals from the black boxes, if that's what it is, it's not necessarily an indication that it's the weakening of the batteries. explain that to us. >> well, in the ocean, the propigation of sound can be very complicated. you know, there are different kinds of refractive indexes, indices that sounds have, if thear listening to something on the other side of a mountain, you wouldn't necessarily hear it. so if the thing is sitting on

the sea floor and we're going around listening to it, we may not have a direct path. and the variation in intensity may actually be due to the topography and the different types of paths that the sound can take. rather than the weakening of the actual system itself. >> and jules, what about the silt at the ocean's floor, how will that complicate things further? >> i think it will complicate the search effort because the typical sequence, and this is how titanic was supposed to be found and the air france 447 was found, was to go back, if you have a reasonable area to understand where it is, with an underwater torpedo which will use acoustics to localize targets and will go back with an optical imaging system. the silt at that point could be a problem, depending upon the

thickness of the layer. >> all right, jules javi is a research oceanographer from scripps, speaking to us from san diego. we appreciate your insight. thank you very much. >> i'm rooting for them. let's hope for the best. >> aren't we all? thank you very much. we will have more on the search later. this hour on cnn newsroom, first we'll update you on other stories we're following right now. investigators looking for answers as a u.s. teen allegedly goes on a stabbing rampage in the halls of his high school. >> also ahead, more tough questions for olympic athlete and accused murderer oscar pistorius. do stay with us.

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welcome back. authorities in pennsylvania are trying to figure out why a 16-year-old high school student went on a stabbing rampage. witnesses say the suspect brought two kitchen knives to school wednesday and ran down the hallway stabbing people. at least 20 students and a security officer were injured in the attack. an assistant principal was eventually able to tackle the suspect. >> the fire alarm went off. i was walking over towards the exit. and there was blood all over the floor. thought maybe someone had a nose bleed or something.

and someone why would she got stabbed. >> thought it was a normal fire drill. i saw people running and screaming and crying. so i thought, oh, something has to be wrong. then i saw people holding each other's hands. i saw other people getting cut. just blood everywhere. it was very traumatizing. >> the suspect has been identified as alex hribal. you see him here. he's being charged as an adult, with four counts of attempted homicide, and 21 counts of aggravated assault. the community of murrysville held a vigil on wednesday night to pray for the victims. ten people are still hospitalized, four of them are in critical condition. >> police in florida are looking for a driver who pushed another car into a daycare center, killing at least one child. the girl died at hospital and 14

other people were injured, most of them children. about 50 children were in the daycare center at the time. >> please, spend this evening and this afternoon in prayers for the families who have children who have been injured in this absolute tragedy and disaster. keep them in your prayers and please keep a look out and let us know if you see anything. together we'll find whoever is responsible for this and those feels need to know this whole community is behind them. >> as you heard there, police do not have the person responsible for this. they're looking for the driver of this dodge durango. they say he was trying to flee car into the daycare center.her- oscar pistorius should be arriving at a south african court about an hour from now as his murder trial is set to resume. pistorius will be on the witness stand for the fourth day, talking about the night he shot

and killed his girlfriend, reeva steenkamp. pistorius said he thought someone was breaking into his house. on wednesday, the prosecutor showed video of pistorius shooting water melons at a firing range. and they displayed a graphic picture of steenkamp as well. here's a look back at that first day of cross-examination. >> you killed her, you shot and killed her. won't you take responsibility for that? >> i did, my lady. >> then say it then. say yes, i shot and killed reeva steenkamp. >> i did, my lady. >> mr. pistorius, did you at any time, intend to kill reeva? >> i did not intend to kill reeva, my lady, or anybody else for that matter. i felt helpless. i wanted to take her to the hospital. i had my fingers in her mouth to help her try and breathe.

i had my hand on her hip. i was trying to stop the bleeding. >> oscar pistorius as you've never seen him before. [ gunfire ] >> screams of delight, but listen to the voice of a man who sounds very much like oscar pistorius. >> it's a lot softer than brain, but [ bleep ]. >> i didn't at any point compare it to human or shooting a human. >> no, you did. you did. you said it's softer than brains. who else got brains? >> my lady. i was in that whole sentence, i was referring to zombie. >> but one can see the effect the ammunition had on a water melon. it exploded. am i right? >> that's correct, my lady. >> you know the same happened to

reeva's head. you know you don't want to because you don't want to take responsibility, but it's time that you look at it. >> i've taken responsibility by me waiting -- not waiting to live my life, but waiting for my time on this stand to tell my story for the respect of reeva. but i will not look at a picture where i'm tormented by what a felt and saw that night. i remember when i picked her up. i don't have to look at a picture, i was there. >> very difficult to listen to. prosecutors are trying to convict pistorius of premeditated order. but so far most think he was reckless in using his gun. >> here's pistorius's account of what happened. in the early hours of valentine's day, he and reeva were asleep in the bedroom. he got up to bring fans in from the balcony and to close the door. at the same time, reeva got up to use the bathroom, but he

didn't realize that and says he thought she was still in the bed. then he heard a noise, grabbed his pistol from under the bed and moved down the hall to confront the intruder. he heard a noise in the bathroom, thought the intruder must be inside, and he shot his gun. the prosecution has a different theory. they say there was shouting and screaming around the time of the shooting. it was so loud the neighbors could hear it. they're implying either the couple had a fight and that's why he killed her, or that she screamed when she was first shot and pistorius should have realized his mistake and stopped shooting. >> pistorius is expected to face more intense and emotional cross-examination when court resumes about one hour from now. stay tuned for that. another update on our top story coming up for you, the mystery of flight 370. >> and we'll show you what an

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mazola makes it better. welcome back. want to bring you the latest now on the search for flight 370. 14 planes and 13 ships are taking part in today's hunt for the missing malaysian jet liner. >> they're covering a smaller search zone, about 58,000 square

kilometers. authorities narrowed it down after analyzing satellite data and four underwater signals detected saturday and tuesday came from that same area. >> tuesday's pings were weaker, adding to concerns, the locator beacons are giving out, if they haven't already. >> a first step toward answering the many questions surrounding flight 370 will be finding its flight data recorders. as rosa flores reports, that will require a lot of technology and patience. >> reporter: four times investigators have heard pings that are consistent with the signals coming from the missing jet's data recorders. >> i believe we are searching in the right area, but we need to identify aircraft wreckage. >> that's where this probe comes in. it's sent to scour the ocean floor. it's an autonomous underwater

vehicle and it uses side-scan sonar, you can see it right here, to create that picture. it's also equipped with a gps system. you can see it right over here. 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, it's tethered. that would not be the case of course in the indian ocean. once this launches on to the water, it kind of floats, it's buoya buoyant. >> to get down to a depth of 4,500 meters, it takes about two hours. >> this is an auv made by bluefin robotics. it's the same auv that's in the indian ocean ready to dive more than 14,000 feet in search of the missing triple 7. this animation shows how it moves along the ocean floor as

if it were mowing a lawn, creating a map of potential plane debris. it's also equipped with a still camera, essential to the search. >> so once we get a debris field, we'll have the auv run a pattern over the debris field with photographs. that will proch identify the airplane for sure. >> if they find flight 370, this remotely operated vehicle, an rov, can retrieve the black boxes from the ocean. >> you have your two cameras here, pilot monitor and co-pilot monitor. >> the rov can operate in the deep sea where humans can't and may be the only chance of recovering the flight data recorders and any evidence of what happened to mh370. rosa flores, cnn, new york. and if you want to track fast-moving developments on the search for flight 370, but can't get to a tv, you can always stay

updated by logging on to our website, cnn.com. and that's all we have for this hour of cnn newsroom. i'm rosemary church. >> and i'm errol barnett. thanks for your company. stay with cnn.cous. >> and for our international viewers, errol and i will be right back after this short break, with another edition of cnn newsroom. stay with us. i'm on expert on softball. and tea parties. i'll have more awkward conversations than i'm equipped for, because i'm raising two girls on my own. i'll worry about the economy more than a few times before they're grown. but it's for them, so i've found a way. who matters most to you says the most about you.

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>> we have breaking news tonight, the search area for flight 370 has narrowed significantly tonight after more pings were picked up by the australian ship ocean shield yesterday. 13 shippedz and 14 planes are out there right now, criss-crossing an area that's about 7,000 square miles smaller than yesterday. the ocean shield's 24/7 search with the navy's towed pinger locator is still going on with the ship's non-essential equipment turned off to minimize distracting noise. as the search goes on, there are still more questions than answers. you've been tweeting us questions biy the thousands. like this one from debby. if they find the black boxes, how long until they find out what happened?