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Only until then are you positive you have it. >> even then, experts say, sound in the ocean can play so many tricks on your ears. >> several people can look at a signal and see different things. because all they're really recording is sound energy. >> false positives from fishing and research equipment left in the area. from debris and thermal conditions. from the vessel itself can also play tricks on the techs. phoenix's operators are good at weeding out false positives. they do it by carefully monitoring the specific frequencies and repetition rate. and at centers off-board, they're highly t...

The "bluefin" able to monitor in realtime. so that work is ongoing. and maybe we might get a breakthrough. maybe we might get lucky. >> that's the hope of us all. especially the family members. geoffrey, thank you. >> also 20 hours we'll have to wait in between each time it goes down and comes up. so a lot of time -- this will take a lot of time. >> it will take a lot of time. but also that point he made that the conversations he's having off record and he's taking from it there's a certain amount of information that hasn't been made public. and they may be the source of the confidence. >> boo...

Area because any chance of hearing the ping, you want it to be as pristine and quiet so nothing interferes with that. >> the fact that they heard a fifth ping, a false alarm, the fact that they haven't heard any since the first four, that would reinforce the notion that the batteries are most likely dead? >> it's also important that the false positive, the sonobuoy may have had a hit, that's fairly common in sonar work. you look at the accumulation of evidence and how things line up. they are doing it in the right way. >> your assessment is that by next monday, tuesday, wednesday, they send th...