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But i think the confidence comes from the fact they had four hand shakes and a partial fifth from the satellites. that last one, as they sent the "ocean shield" and their assets right there and boom, first day they got the ping. i think that was a big confidence builder that let them know they are in the right place, that the hand shakes from the satellite directed them in the right direction. i think that's probably the confidence. they seem to be in the right place. their clues so far are panning out. that is my take on why they were confident about where they are. >> mr. ginsberg, there hav...

That ping is the most promising because of its quality is the word they use. details like many others in the search have been coming almost like clock work. we get them from australian authorities. in the search for answers, information has been harder to come by. the item, the co-pilot's cell phone. pamela, what are you learning tonight? >> this is another tiny piece of the puzzle. expert s and sources we have been speaking with are trying to figure out what the information about the co-pilot's cell phone really means. we know that if any of the passengers were on and not in airplane mode the...

Joins us from australia. and what about the australian prime minister saying they will regroup and reconsider. what does that mean? >> if you haven't found anything in the area where you were most promising to find something, and houston basically said it's around the strong -- the ping that gave the strongest signal which we now know this evening was the second ping. if you haven't found anything in that vicinity you've got to really seriously question is it worth keeping going to the first and the third and the fourth? and that's when you have to rethink the strategy. >> jeffrey you are taub...

Week. >> late word just in from the u.s. navy which confirms the underwater search is happening in the area where a second ping was defected on saturday april 5th for 13 minutes. a significant length of time. let's dig deeper into the possibility in spice of the glitches with bluefin it would help to have more in the water. tom foreman has been exploring that angle. >> the effort above the water has involved dozens of planes and ships going back and forth why not apply that same thing below the water? we have been talking about how this bluefin will go back and forth mapping the bottom with a ...

21 back into the water. but this is a really critical time in this search operation, the bluefin 21 having completed its very first mission. it scanned some 34 square miles. that area is really important because it's the area that officials have, in part, identified as the most likely place to find the black box. and that is based on analysis of pings according to the u.s. navy, the second ping that was detected on april 5th. in particular, it lasted some 13 minutes. it was the strongest signal detected. now, if the bluefin had, in fact, found something, it is possible that they could fit it w...