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50 degrees in the waters around there and it has been many hours that some of those people have been missing, paula, thank you so much. another snag in the deep sea search for flight 370. the unmanned blue fin 21 was forced to resurface for a technical problem that was fixed. while it was on board, officials downloaded data from that device. that data shows nothing significant on the ocean floor. meanwhile the families of the passengers missing on that flight, they are fed up. they say there have been too many lives and broken promises, so today they stormed out of the malaysian airlines briefing. the we know if that bluefine 21 ....
Ocean has a lot of silt on the bottom. and if we have silt on the bottom, that could be quite layered, quite deep and that could complicate how things are on the bottom. the vehicle it s having trouble getting to the ocean floor in the sea area. there are a lot of challenges here. our stephanie elam is off santa barbara, california for a little show and tell for us of sonar. it s interesting that this sub is taking pictures with sound. tell us about that. reporter: exactly, christi, that s a great way to put it. we wanted to come out here and show you how it works, i want to introduce you to james. there is sonar, but there ee s ....
Up a small tool. this operation alone took two weeks in 2,000 feet of water. a small task compared to retrieving mh-370s flight recorder which could be about three miles under water. they just shift through the trash until you find it. you might need to pull every piece of that trash up before you find it laying under something. reporter: the challenges don t end once the debris s collected. lifting thousands of feet to the surface is a science in itself. sometimes it takes several trips. the journey three hours each way. the most dangerous parts of any recovery is getting that from the water on to the surface. reporter: it s not just objects either. 239 people were on board malaysia flight 370. warren recovered other plane crashes. he s seen the graves that remain. how hard is that? it s i guess it wouldn t be any different than a fireman or policeman or soldier, it s a job. reporter: keeping emotions in check. the delicate balance crews face ....
Cover a broader area. reporter: it s a slow going process because they are pretty much flying blindly because they don t know what s at the bottom of the sea floor. and they also seem to be testing the limits of the device too. i would love for you to ask james, we were expecting 16 hours down, two hours of mapping, we were looking at a 24-hour period, but they have had some technical issues? reporter: yes, they re having those technical issues on that 24 hours of going down. that s part of the deal because the reason why it takes so long is because it s so deep, right? theyer re planning extremely long distances. there s a lot of interconnected ....
Multiple types of them? there s a variety of technologies, primarily they re going to use side scan sonar. reporter: how do they work. the sonars work in the same fundamental principle. they re going to be emitting sound. as that sound hits the sea floor and comes back to the sonar, it s going to come up to either an image or data that s on the bottom of the ocean. this has gone into the indian ocean it s a very complicated process, from the perspective of the sonar, it s actually very good to have the sonar deep, it will produce very good data when you re nice and deep. but the complexity is getting that sonar down near the bottom. they have to get close to the sea floor, they have to dive through i want to look at how this data comes in. one of the things they re ....