the challenges of what happens when you get down there, are you yet convinced that these pings are the black box? >> well, you know, remember the frequency doesn't match. there's been some speculation that there might be some reasons why the frequency has changed. >> battery life, depth. >> consistent with it. but it's not that kind of smoking gun that you really want where it's exactly the right frequency. so after a month of this bizarre saga that we've been through, it's all come down to the cylinder of ocean, about 12 miles across or so, about three miles deep. this dark, cold, you know, alien world. and we're trying to find out what's in this cylinder, if it's there, great. if it's not there, well, boy, we're really back to square one. >> especially when we are at -- we are even past what should be the battery life of these pingers. they still want more pings at these depps. it thanks for your perspective.