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Had spoken. the family members had spoken with many aviation experts and that they didn't have much credence in those pings. are you one of those aviation experts that feels that way, that there wasn't a lot to be said for these pings, the wrong frequency, et cetera? why was so much put on them if those were not the right -- that wasn't the right intelligence? >> well, and i was one of those people to say why don't we test them? it was amazing to me that we didn't have data that would show what would happen to the pingers when they're under water and under the pressure of water for more than 3...

Than that. they picked some of these up for hours and hours and hours. what else would they have been? >> well, you know, now the navy is explaining it might have been some frequencies from the ship, from the towed pinger locator itself. i'm still skeptical about trackers on marine life. but they're saying from the very equipment itself could have caused these pings. and many of us were asking all along is someone checking what happens to a pinger underwater for 30 days. we have now had three months. they could have checked it twice. does a 37.7 kilohertz pinger degrade under water pressure to...

Again is the only way to pinpoint its location. the ocean shield moves about two miles an hour tracking the picking. multiple hits are crucial in triangulating a massive search area. >> until we detect a ping, we will not deploy the submersible. is that clear? unless we get another transmission. >> reporter: this is the submersible, bluefin-21, the under-water drone moves along at a very slow pace, mapping the ocean floor. the pinger manufacturer is analyzing the recording. it is actually at 33.3 kilohertz, a lower frequency than the standard .5, a change due possibly to environmental factors....

The salinity and the surface temperature. you might get a difference in temperature between a lower layer and an upper layer and a difference in salinity, in density. and this would affect the path of sound waves. and so the two ping signals could very well be coming from a signal source. and with all the errors adding up, they seem to be very far apart. but if you're going to look some place, this is sure a very good start. >> yeah. jeff, we are learning tonight that the pings detected by the "ocean shield," as bill nye was just referencing, were actually at 33.3, where he said you may get a ...

Used by bringing in more evidence on the radar tracking of this aeroplane. and the location is exactly on this track that the ships were told to go and have a look at. so there's some supporting evidence that, yes, they are the black boxes. >> we listened to this press conference live from angus houston, paul. you were optimistic about this, but now cnn is hearing that the frequency detected was 33.3 kilohertz, not 37.5. do you still believe that these are, in fact, the pingers, and is it an exact match? is 33 that close to 37? >> okay, we're talking about 10%. and we had a discussion this eve...