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And i can discuss, but we do appreciate you joining us. jeffrey thomas from perth. >> pleasure. well time is ticking away on those batteries, as you know in those black box pingers. if they do get to the 5irarea of the data recorders and do get them that will be absolutely critical. here with more on what's in those recorders and what valuable information they hold is miguel marquez. >> reporter: the search for airasia 8501 narrowing. the hunt on for a tiny signal in a turbulent sea. new pings from the data flight recorder. >> the pinger has a pulse and it comes in a specific interval and sp...

So david, i mean what do you think? do you think that -- is this even an issue, the battery power and the pinger or are you convinced that a lot of debris has been recovered or some debris has been recovered that eventually this is going to be found -- the fuselage will be found by searchers pretty quickly? >> it's still a very important piece because of the fact that even once they find the main part of the aircraft or the tail of the aircraft these boxes are twisted and mangled in amongst -- all of that metal could be under the dirt. there's a number of places that box could disappear to beh...

Wave or waves hit it before the people on board could get out and that's what ultimately sank it. i want to bring back les and david to weigh in on this. this minister one of the reasons he has come up with this theory is because the pinger or one of the alarms didn't go off that's designed to go off on impact if you crash into the sea and they didn't get any indication of that so he is saying that might lend itself to the idea that there was a soft or controlled landing. >> he's referring to the deceleration indicator. so if the elt decelerates quickly, which would be if the aircraft went in ...

Miles away from the wreckage. it could even be conceivably be on dryland. this is a very important development. heather: you talk about the ping errant ability to trace that. time is of the essence and also the debris itself as we go day by day and the weather conditions deny access to that area. the debris is being spread across a wider area as well. >> some off it is being found 100 miles away from the last reported point of the aircraft. these are the old pinger batteries. right now they have 30-day batteries. to use a football analogy it's a running clock. heather: there were reports at le...

Those so-called black boxes only have about 25 days of power left. for more on the search and recovery, let's bring in mary schiavo, former inspector general for the faa, david soucie and peter goelz, former managing director of the ntsb safety board. mary, i'll start with you this time. talk about the challenges inherent in finding a black box. why haven't they found a black box yet? >> well, first and foremost, it's just the condition of the seas and the inability to get out there with all of the equipment to really find them and try to find the pingers, et cetera, and get their hands on it....