his words, the fact that those elts did not go off, investigators wouldn't be able to rule out the fact that this plane maybe landed safely somewhere, so that's a lead they have to chase down. but just for some perspective here, those elts do not work in water. even though it made that impact with the water, once it goes down into the water, you would not get a signal and everything would happen so quickly. so as one person put it tot me, it would make sense that this elt did not signal. >> elt, what does that stand for? >> the emergency locator transmitter and that's it right in front of you there. >> this is it. >> and that is to let search and rescue essentially know where a crash site is. that did not go off in this flight. if it did indeed make impact with something, they didn't get that signal. >> all right. thanks very much, rene, don't go toofr away. we're digging deeper.