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On top of it, maybe a few days. if not and they have to search up and down the possible paths, 17 miles at this point, that's a long time. they will be looking at weeks to months. >> air prance, the pinger was not working. here you have data. i wonder if could you explain the urgency here. you are a pilot. one of the key driving forces here you need to know what brought that plane down because if it is mechanical you want to correct that so it doesn't happen again. >> over 990 777s flying. i'm sure boeing wants to know. was it a mechanical error on the aircraft that brought had down? was it no...

Fact they are man made, but the person on this show believes it is the pinger, what else could it be? >> well, there are scientific reasons that there would be pingers there, but shame on the scientific who has a pinger there and is doing this and saying hey, this is mine. that probably would have happened. so i tend to believe they're marching down the right road. but this is so extraordinary without a shred of debris, with all of a sudden out of the blue, seen -- seemingly out of the blue, the only explanation i have on this, the category not shared with the public is the horizon over the ra...

Size of -- maybe a little smaller than new mexico now. then the prime minister seemed to intimate that the search area for the black boxes themselves is much smaller than that. is that what he meant, rob? >> he's saying -- he's implying that the pinger location is an area of high probability within the overall search area. again, we're not dealing in an exact environment. when you're dealing with acoustics or sound under water, sound can bend, it can bounce, it can be inflinsed by a lot of factors. until you actually have eyes on the wreckage, you can't be completely confident. >> david, let m...

We've got no clues. we don't know why this was done, really even who did it or why. it's just one huge question mark. and maybe people are getting frustrated. oh, and to mention -- don't forget to mention that now the pinger's probably dead. and so our odds are getting worse by the minute. our only hope -- listen, a few days ago, they weren't even going to deploy these towed pinger locator equipment until they found some wreckage that would let them narrow down the search. they didn't have any wreckage. the pinger was about to die. they said let's throw this in the water and hope for the best....

Looked at them, they've tried to tune them so they can detect the frequency of what the pinger should emit. the first thing. the second thing is they operate deep enough. almost 300 meters, maybe deeper, and are able to provide that good link to a better acoustic channel away from the noise of the surface. the only problem with them is they really are a narrow area search tool. when you think about it, you've got to drop sonobuoys near something you're interested, you think exists in the water. right now, they're looking at an 18,000 square mile search area. that would take between 40 and 80 d...