half and that apparently it has a pulse signal of 37.5 a kilohertz, what is -- what's encouraging to you about this information? >> well, that's encouraging, because that's the secret number for the frequency for the black box pingers, and the rep rate was about right, meaning it makes that noise about every second. the idea it was only heard a short bit, i kind of get that the water depth of that area goes from shallower than 2,000 meters, less than a mile and a half, to greater than 5,000 meters which is about three miles. depending on where it is inside there, i could see that the signal could come and go, depending where they are with the boat. so there's nothing, you know, that's like out of place. it's just waiting to make sure that that's really what was heard yesterday. or today. >> your feeling, there are a lot of potential obstructions down below, that if indeed this was