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The advice from the manufacturer is that 33 kilohertz is -- or 33.2 kilohertz is quite credible. the air france locator battery from five years ago was 34 kilohertz. so, what happens, there's a change, with the pressure, on the ocean floor, and the age of the particular batteries, the capacities can change and you get changes in the transmission level. [ inaudible question ]
In perth, 3:00 in the morning there. will, the ping detected by the ocean shield was not the same frequency we would expect to hear from a black box. what are crews there saying about that? >> reporter: yeah, remember when we first got the word that those chinese ships that potentially heard a ping, and we heard the 37.5 kilo hertz, and then we're hearing that these pings were like 33, and 33.2. and so you're wondering, what gives, why is it not the same number? well, the manufacturer of the black boxes says that that -- it still makes this a credible lead. there's still a very good chance tho...
Nye, michael kay, steve marks, and paul ginsburg. paul, i want to get to you quickly, because i want to talk about what he said. we're wondering about the legitimacy of 33.2 kilohertz, was it credible. angus houston said, yes. we have to remember that air france came in at 34 kilohertz, because of the pressure of the ocean, the depth, the age of the batteries, it can change the transmission level. do you concur? >> well, there's an easy way to find out. i would suggest that we do an experiment as part of this investigation by dropping new working pingers into this part of the ocean, and measur...
Many, many, many days because it's very slow, very painstaking work to scour the ocean floor, so -- and of course, the depths are -- are very deep. and it's very challenging. [ inaudible question ] yeah. the advice from the manufacturer is that 33 kilohertz -- 33.2 kilohertz is quite credible. the air france locator battery, from five years ago, was 34 kilohertz, so -- what happens, there's a change with the pressure on the ocean floor. and the age of the particular
That underwater autonomous vehicle, it would be a very, very, very long time before they could verify or find any sort of wreckage. christine? >> tell us about the difference in the signal strengths. is that casting any doubt on their findings? >> reporter: well, the signal that they detected is a total of 33.2 kilohertz, and they're expected to detect a signal of 37.5. houston addressing that at the press conference earlier today, saying that that doesn't necessarily diminish these results, given the conditions out on these vast, deep ocean waters, some 2.8 miles deep. sound can do funny thin...