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Investigators haven't heard any of those pings since the two they heard over the weekend. so now what's the strategy for this narrow search? we'll talk to an ocean expert, live, coming up. ameriprise asked people a simple question: in retirement, will you outlive your money? uhhh. no, that can't happen. that's the thing, you don't know how long it has to last. everyone has retirement questions. so ameriprise created the exclusive.. confident retirement approach. now you and your ameripise advisor can get the real answers you need. well, knowing gives you confidence. start building your confide...

From the surface, and lowering it by the pole. the reason that the depth is so important is because, again, as we have been saying, you have to be within a one to two-mile radius to detect the pings from the black boxes, however, and there is a but in the story, and always a but in the story, but one surveillance ocean expert says that there are certain conditions like water temperature that could allow the sound to travel a longer distance, such as cold water, so that might fudge the numb bears a little bit when we talk to the one to two-mile radius, brianna. >> jeff, if i'm listening to the ...

Resolution. it was worth investigating, but i think it spoke volumes that we never actually spotted this stuff from the aircraft. the way the analysis has gone so far just to recap is the satellite pings put us in the southern hemisphere. they should have taken that and overlaid it with the aircraft's endurance based on the radar's last hit. they've just refined that calculation. we're narrowing in using the data we have. now if we can pick up some debris to corroborate it, we'll be in the ballpark. >> let's talk about all the garbage in the ocean. is it likely there's more garbage closer to a...

It would sink down into the water. that way it's not up and running just yet. it's just a big idea. but they need some big funding for this thing. another something i could tell you about. there's another biosphere out there built on land in arizona built in the 1980s thchlts a research and development facility for a self-sustaining station columnization technology. people have spend two years in this thing. pretty public exercise they went through. it's owned by the university of arizona. that's the on-land version of what they're trying to do with biosphere 2 which could take you underwater ...