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Talking about the fact they re intermittent. because of the nature you played earlier the pinging noise and because of the nature of it, it repeats and repeats and repeats. it doesn t suddenly just stop or it doesn t drift in and out. our understanding of what happens is that this can can, you can often, you can often, it can often cease to make that noise either because of wave action or because of the boat motion or any of those sort of reasons. and that s why he said it was so important to go back and have another listen to make sure to see if they could find it, again. in terms of the battery, our understanding of that from the company that makes the machines is that the pinger doesn t just stop. it s not like a light switch and doesn t do what you just suggested, stop and then start, stop and then start. it is sort of a gradual fade. the signal gets weaker and ....
And the tpl won t exclude any place. doesn t really narrow it down very much then necessarily. mary but the go ahead. john, i like what i see. for air france 447, something that people thought, a plane people thought would never be found. we had a good last known position and we had the debris. the debris was good to say you re in the right area. but the retrofit of the debris led us on a two-month wild goose chase. we lost time with the debris. it was good old plowing back and forth, mowing the lawn of the ocean floor that found that aircraft. i m often struck by the differences here. as you said there was debris there within days of that flight disappearing. here obviously no debris and we re a month into it already. mary, with the batteries either dying soon or perhaps already ....
Give more information. because what they appear to be doing is moving this box around and not really explaining why. so they have to explain why to us. that s an interesting question. david gallo, i want to bring you in here. as they re moving these assets around and changing the search area, now they have the towed pinger locater out there. how confident are you that the batteries in the black box are even still working, even still pinging? that s anyone s guess, john. here s the thing about that. going over an area and not hearing the pinger doesn t mean that the aircraft is not there. the tpl is useful if you do hear something. if you don t hear something not that useful. i think at this point, knowing where the plane isn t is important information, too. and the tpl won t exclude any place. doesn t really narrow it down very much then necessarily. mary go ahead. john, i like what i see. for air france 447, something ....
You have underwater because time is running out. so i would do exactly the same thing. you also, sylvan, say that you think that this is all right now obviously based on data, the analysis of the data tax . do you think there s more data out there and do you think there needs to be a better analysis? that s a very good question. because in the case of air france, on one hand we had too much data. on the other hand we had too little data. the idea was to backtrack the data that could help us on the ocean as opposed to the air problem. so we sort of went through the data and then found new data that helped us narrow down the retro drift and the positions of the debris field. david it certainly doesn t sound in this case like it is case of too much data, does it? not where we need it, right. ....
You here. the towed pinger locater. in the water as we speak, searching for these pings from the black boxes. what do you think the chances are that we ll find anything? well, in case of the air france, we had two towed pinger locaters. we went over the whole area. and the water is so deep that you have 10,000 meters of cable behind the ship. so it s very difficult to narrow down the position it doesn t sound like you re very optimistic. is this just a case where it s better than nothing? i mean, in this case you have to try everything, everything. and especially the pingers are going to be operating for 30 days, maybe a little bit more. you never know. try everything. it s just as simple as that. david, so in addition to the towed pinger locater, the ship right now has the blue fin, the autonomous underwater vehicle right there. tell me when that would become useful. well, in some ways, in the ....