the search has resumed in the indian ocean for flight 370 and the search area has moved east. we heard from australian officials about what an inexact science the search is. so far no wreckage, but what if they do find something and it's at the bottom of the ocean? randi kaye takes a look at that. >> reporter: this is what it looks like trying to recover an airplane in the ocean. you're watching a u.s. navy salvage team gather pieces of twa flight 800, which went down off new york in 1996. >> the u.s. navy has recovered an in tact helicopter from 12,000 feet.

>> reporter: retired captain chip mccord has been involved in many salvage recovery operations. but those were in water much shallower than the indian ocean. the navy has underwater vehicles designed for deep water salvage operations. they can go as deep as 20,000 feet, but the deeper the recovery, the slower the process. >> it takes about an hour for every 1,000 feet that you need to descend. so if you're going to 11,000 feet, you can count on 11 hours to get down. >> reporter: at those depths, it's pitch black. so the underwater vehicles are equipped with lights and cameras. they're also outfitted with sonar to scout for debris. they are steered by two operators on board the ship above, who use instant feedback from the salvage vehicle's

cameras to direct the robotic arms. >> they can hover, they can move left, right, forward and aft, and go to where they need very carefully, hover over a piece and pick it up if they need to. >> reporter: remember air france right 447 which crashed in the atlantic ocean in 2009? two years later, an unmanned vehicle found the debris field for that flight, 13,000 feet beneath the surface. the engines were pulled from the ocean floor. if flight 370 is found, search teams are prepared to do the same. >> if it's small, the rov can pick it up and put it in the basket. >> reporter: but they can only carry about 4,000 pounds, so anything heavier, like the fuselage, will have to be attached to a cable and pulled to the surface by a crane on the ship. keep in mind, this could be happening miles below the

surface, an incredibly difficult task. still, no doubt salvage teams will keep their eyes peeled for the black box, hoping to get much-needed answers first. randi kaye, cnn, new york. >> fascinating technology. joining me once again is david gallo, and also a technical adviser in the investigation of air france flight 447. it's one thing to look at the technology, but i'm also fascinated, this is essentially a human operation. it's human effort being exerted out on the sea. what is it like to be out there, what is it like to try to constantly be searching, to constantly not have enough information? it's got to be so difficult. >> finding the information is crucial. when we were out there the first time, it took us a long time to just figure out what was happening, because it was -- it was a total mystery. >> was it the debris that

started to give you the first -- i know you had gotten some data from the plane before it went down, but was it finding those pieces of debris five days into it? >> we had the data, we had the position of the location of the aircraft, we knew that the airplane had a problem, because the maintenance messages were sent out. so we were in a better position than the people searching for this flight. >> there's just not enough data points right now. >> it's all about data, understanding the right data. in the beginning of the air france flight, we had too much information and not the right information. it's just a matter of understanding which information you need. >> david, as we talked about, until you find a debris field, until you know where the plane entered the water, all this underwater equipment is not to be utilized. >> it's not like there's a lot of teams that can do this kind of work. so the human power behind the

effort is very limited. so you don't want to burn out -- and it's also difficult to move out. you have to have the right ship, you have to mobilize on that ship. you have an air ship or freight. ships go about 10 or 12 miles an hour across the surface of the ocean. >> when you're -- how much of the air france flight wreckage did you end up bringing up? once you get the black boxes, is that enough? do you not need to bring up more of the wreckage? >> you needed the black boxes and just for safety, we would get the engines afterwards in case something needed to be done after the investigation. but the main thing was the black boxes. >> we want to use these remotely operated vehicles with incredibly high precision navigation to do very accurate, high definition still photography, videographer and make a virtual site so you can bring that back to the investigators.

in this case, it would be the accident investigation team. so before yotu things up, we have the ability to do that work. >> i don't want to get too -- i don't know if gruesome is the right word, but there are families waiting to hear what happened to their loved ones and would like to have them return home, whatever that means. and for air france, were you able -- is recovering people from the depths, is that part of it? or are they -- are they left there? >> well, you want to answer that? >> it's a difficult thing. we get emotional, you try to be unemotional about it, but you can't help, you're just below the layer of the scientific aspect, there's a deep emotion allayer. i can just say whatever you want to recover from the depth, you can do it if you have the will, yeah, sure. >> the -- again, you had so many data points on air france.

then it took two, almost two years -- >> 600 days. >> i'm sure you were counting each of those days. do you see -- miles o'brien was saying he's pessimistic that maybe anything will be found. are you? >> something that's been bothering me, one, it's -- i hear a lot of comparisons to air france, almost like it's a competition, like which one is tougher. it's not to be meant a competition like that. it took two calendar years, but a lot of that was spent haggling trying to get back out there, getting permission to get back out there. all told, we spent -- >> four months at sea. but it took a long time to analyze the data, the good information, the not so good information. >> you don't want to burn out crews and stuff. you want to get your ducks in a row. >> exactly. >> but this case it's just where do you begin, without that last known position, without a shred

of evidence that the plane is in the water at all. >> things like bureaucracy, getting permission, all of that impacts an investigation. >> sure. >> in retrospect, looking back, this has only multiplied the number of foreign nationals involved. >> we were talking about how unfortunate it is we find ourselves back in this situation after air france. there needs to be a better system to deal with these things where people cooperate. and here we have the same kinds of issues about who's bringing what to the effort. it's frustrating. >> i appreciate you being on the program. we just got word that the tsunami warnings for chile and peru have been canceled. so that's certainly some good news there. we'll have the latest on that coming up. also ahead, what the airlines is admitting about the fatal crash

of its boeing 777 in san francisco. and the washington landslide, the death toll has risen to 28. tonight, we're getting our first look inside the search zone. and. 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 that's just the start. to produce more from existing wells, we need advanced technology. that means hi-tech jobs in california and colorado. the oil moves through one of the world's largest pipelines. maintaining it means manufacturing jobs in the midwest. then we transport it with 4 state-of-the-art, double-hull 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.

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tonight, there's more news about another boeing 777, it crashed while trying to land at san francisco general airport last july. three people died, more than 180 injured. it was the first commercial airline crash in the united states in more than four years. the investigation still ongoing and newly filed documents, pilot error is being admitted. >> oh, my god. it's an accident. >> reporter: from the very beginning, it seemed clear that flight 214 from seoul, korea,

was flying too low and too slow on approach to san francisco. >> there was no rain, no fog at the san francisco airport. i've seen it in much tougher conditions to land. so yeah, it was so shocking we could miss the runway by so much. >> reporter: the plane clipped a sea wall and someone, breaking into pieces. there was chaos on the ground. passengers ran from the plane as emergency crews arrived. they doused the plane with foam. these pictures show you the aftermath inside the cabin. rows of seats were also dislodged. three passengers died, one run over by a fire truck involved in the rescue. scores of others injured. now nearly nine months later, the airline admits in a regulatory filing that pilots failed to maintain a safe approach. given the pilot's experience and training, there are no obvious explanations for why they did not recognize the deteriorating air speed and abandon the approach sooner.

yet the airliner says boeing and its 777, the same model of plane missing, is also partly to plane. it says the plane's navigation instruments, airplane software, led the crew to believe the jet was maintaining enough speed to land safely. in its own documents, boeing says not so. placing the blame squarely on the pilots. the equipment it says had been functioning normally. >> there's almost 1200 or so 777s flying around. that hasn't been a problem with any of the other carriers that i'm aware of. >> reporter: according to mark weiss, the airline has a weak argument, maintaining that safe air speed is -- >> the bottom line it's the pilot's job to maintain safe air speed at all times. that may go back to a fundamental problem of skill sets or training. >> reporter: the federal aviation administration urged boeing in 2010 to update its

software. but the airline says boeing hasn't done so. the back and forth will likely lead to a legal battle over financial damages. a process that could take years. what happened with the sfo crash and the malaysian airliner could not be anymore different. in san francisco, the cause is clear. with 370, of course, there's still no answer. dan simon, cnn, san francisco. >> up next, more breaking news. the death toll in the washington landslide is climbing. the latest numbers ahead. plus, a look inside the search zone, 640 acres of mud and debris. you make a great team.

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q. i cthis year aloneore places offi hit new york...ist. and texas! see, hotwire checks the competition's rates every day... so they can guarantee their low hotel prices. ♪ h-o-t-w-i-r-e ♪ hotwire.com more breaking news tonight. in oso, washington the death toll has climbed to 28. the youngest just 4 months old. tonight, 20 people are still missing. finding anything in the debris field is incredibly difficult work and covers some 640 acres. and in some places the mud is 70 feet deep. close to 600 people assisted by cadaver dogs are combing the area, trudging through the muck. today anna cabrera got a first-hand look what they are up against.

here's her report. >> reporter: this is ground zero of the washington landslide. our first look at the destruction up close. >> all of this debris was once over the roadway. this all used to be homes. debris piled up to 80 feet high in some spots. tires, twisted cables, large appliances and uprooted trees. the only decipherable objects in the mangled mess. the images don't fully capture the devastation. this neighborhood was mutilated by the enormous force and power of land and water that ripped through this valley. >> we do have family members out here today with us. our family's just gotten bigger. we've kind of adopted the town of oso, maybe they've adopted us. >> reporter: a week and a half after the disaster the driving force remains finding victims. nearly two dozen people are still missing. >> would you be able to find all the victims? >> we're going to try. >> reporter: it's slow methodical work with big risks.

the debris field is full of a toxic sludge, a combination of human waste, chemicals from households as well as propane tanks, oil and gas making the search effort extremely dangerous. every person, animal and thing that comes out of here has to be decontaminated. workers are forced to wait for some areas to dry out before investigating. pumps have helped to clear some of the water where search dogs have picked up human scent. sunshine today gave search teams the upper hand in what's inevitably a recovery mission. all of this heavy equipment is helping to clear the debris off the road to provide more access for rescuers. but the debris is staying put until hand crews can come and go through these piles to pull belongings for family members who lost everything. two american flags fly among the men and women working here. one, recovered from the debris, hangs in reverence for hives lost. another flag at half-staff on a

lone tree left standing in the slide zone. a source of strength and a symbol of hope for better days ahead. ana cabrera, cnn, arlington, washington. up next, the breaking news out of chile where an 8.2 earthquake has hit off the coast. the latest ahead. t for myself. with unitedhealthcare, i get personalized information and rewards for addressing my health risks. but she's still gonna give me a heart attack. that's health in numbers. unitedhealthcare. to prove to you that aleve is the better choice for him, he's agreed to give it up. that's today? [ male announcer ] we'll be with him all day as he goes back to taking tylenol. i was okay, but after lunch my knee started to hurt again.

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want to get you up to speed on the breaking news out of chile this evening. a magnitude 8.2 earthquake that struck off the country's coast has been followed by 12 after shocks. reuters reporting two people confirmed dead, three others with serious injuries. the tsunami warping has been canceled. martin, seems to be an area prone to strong quakes. i understand the region was having strong tremors for weeks before hand, is that correct? >> reporter: absolutely. there will been various trimmers, including in santiago. in fact, geologists have been

predicting all of these tremors have been a build-up to something major. whether this is it or something bigger than be expected in the near future, we don't know yet. but it seems to have been building up to something. also, i am -- i might also point out we've had earthquakes in california, which of course is on the same line. so it may be a generalized problem here. >> reporter: if the tsunami warning has been called off, i would imagine they would be on their way back. although perhaps in some regions, it's not advisable,

since electricity has been cut off. i think the damage is worse than what was originally reported. up to 80% of the city is blacked out. and it may take a while to restore electricity to those cities. >> martin, appreciate the update. >> the government will continue to work for as lon as necessary to face this emergency and protect our compatritheots. >> the hunt for clus, a british submarine joins in the search. we are live in perth. >> i am an angry mother. my family is hurt. i just, i want justice. >>