is technically possible that they did, because of the ocean liars, the gradient, the temperatures, it's technically possible they picked up the same ping from the black boxes, if that's what they turn out to be. indeed, yes, the answer is yes. >> mike, i imagine there's a lot of noise in the ocean. what other, if any other, natural sounds, could be confused for the pinger? >> we've talked about this throughout the day. we can't really identify a sound that would be misconstrued as this pinger sound. as you heard earlier, there's multiple aspects to the pinger. not just the frequency, but the pulse rate, the repetition rate, and it appears to be consistent with what we would expect to hear from an aircraft pinger. >> yeah, as paul has been saying all along, there are other signatures that go along with these emergency pingers, and it appears from the information that angus houston gave last night, that they are -- they carry all of those signatures. but mike, are you concerned that