and you need to eliminate the possibility that anything else is getting into your system. you know, you have to know what you're measuring, and that what you are measuring is what you are looking for and not a result of ambient. >> yeah. geoffrey thomas, we just heard -- we just learned that they aren't deploying the submersible drone until they get another transmission. is that the right move at this point, do you believe? >> look, i think it is, don. and at the same time, we shouldn't underplay the debris search, because now what we've got is we've got what we believe is the location of the ping. now, instead of looking at an area the size of texas, we're now looking at an area the size of houston. so we have a point. and the current around that spot is actually a counter, is a clockwork circle, it's an eddy.