to be potentially in the right location which is a few hundred miles from that central april 5th latest search location, northwest of perth. and that it was able to detect this beacon which what might be on the 30th day, which will be the life expectancy of that battery. that's what's so remarkable here. and that ship is saying that that signal is 37.5 kilohertz per second which is in concert with what you're saying. but what more would you need to hear from this chinese vessel or anyone else leading this investigation to help verify whether what they're hearing is, indeed, potentially the pulse from a flight or voice recorder? >> sure. first thing we would want is multiple sources they can pick up this signal. also, keep in mind, there should be two beacons in that general debris field. the cockpit voice recorder and