shie shield. i mean, is it likely with such rudimentary methods that they have picked something up? >> it is possible. simple is better, and if that signal can travel through the water and reach that hydrophone, you will get a response. and they have evidently think they have heard a response. and also, any sew for tn sonar out there at 37.5 kilohertz will see the frequency as with well. >> and thank you so much. and i will get to the panel shortly, but richard, you wanted to get in on that, and very great question. we will talk more about that coming up, and time is running out on the flight recorders or the black boxes, and if the beacons stop working, just how much harder does the entire operation get? we will discuss that on the other side of the break. don't go anywhere.