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Quote, duress. malaysian officials originally said the final words were "all right, good night" said be the copilot. we learned a few more things today. what else? >> each time they hear something new it brings new hope. here is one of the up sos they heard. this is computer analysis of one signal. experts are trying to confirm if that came from a black box, from flight 370. our open trace gallagher spoke with an ocean salvage expert who is not involved in the search, but says he convinced. >> these represent they have located where this plane has crashed. >> malaysian officials say they

>> want to make a final point? >> when it came to the computer analysis, they turned to the fbi. they said, these are the best examiners in the world, they have the most expertise, so they sent the comb pumt puters to qu virginia. they'll be looking for the best experts to handle this. >> all right, guys, thanks very much. up next, we'll speak with an underwater expert about all these challenges that face them now. ameriprise asked people a simple question:

Practice emergency procedures and routes and put all of these different airports on his simulator. what is more important than the simulator, will be the computer analysis and if they go and bring like home computers in. if somebody is bad in doing something, it is going to show on their computer. it is it no way to hide. if you do information search it is on their. >> simoutor come loaded with thousands of a strips. >> but which ones did he go to? that is some what telling? you can tell the difference between an emergency airport to go to and something sen hours away. that is a big difference...

Going. they are looking at thousands of miles of ocean as the maps show us. how it pick out an element that may be some piece of debris. a lot of that is been through computer analysis. it's tough. you have to have an idea of where you want to start looking. it may be sadly somewhere over the indian ocean. it may be the common sense answer to all of this. it went down along the expected flight path. nobody knows. >> this is the satellite image and wondering what was to be made of that. >> the contributors here on cnn, you are there with any response. what do you make of this? >> it is an extra...

The authors. as far as we know, the u.s. government has broken no laws with all of this surveillance. it has followed all established procedures. congress approved these programs, though it did so in secret, writing laws that aren't public. shouldn't we know more about the actual checks and balances for this kind of surveillance? the larger question "big data" raises is this. should any government be permitted to use computer analysis, even if highly accurate, to observe, inform, quarantine or even arrest people because they are likely to do something bad? that seems like a scenario from a sci...