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>> why? >> well, because they are clearly getting more and more confidence in the equipment that they are using to try to pin down where the aircraft went in. so they are more comfortable with what they have now. the fact that it is larger than what it was before, that just means that obviously they are more confident in the accuracy of that and it's progress. >> for those of us not in the business of this aviation expertise as all of you are, i think most of us would think that to triangulate and search the area of the field, that would be the direction that these searchers would want to go. ...

Let me bring you in first, simply because it seems to me that for the purposes of this conversation, let's say that the pinger batteries are dead. now we go to submersibles. what is the primary mission right now? >> the primary mission really is to find debris field on the seabed and hopefully, it will be somewhat recognizable. it could be really broken up, but usually, get something like the tail or wings or cockpit that might be recognizable, even by sonar. so, once you find that, specifically in this cairns the tail, then you really focus in on the tail with video and photographs to see if ...

Those batteries of the black box pinger have completely expired. the question now being when exactly are they going to feel comfortable to make that assumption and deploy the underwater autonomous vehicle to find the physical wreckage, isha. >> 37 days into the search for flight 370. erin mclaughlin there in perth, thank you, erin. not much is known about the seabed in the southern indian ocean. it's one of the most remote places in the world. in fact, it's said we know more about the surface of the moon and of mars than we do about the bottom of our oceans here on earth. tom foreman looks a...

You are hearing simulations what the sound is. it's also at 160 decibels. think about how loud that is, it's very loud, ten times louder than osha requires hearing protection for humans. so it's 160 decibels, about as loud as a gunshot. if you think about being in the mountains and shoot a gun or hear a gunshot, you have no idea where that's coming from, you hear the gunshot. that's where they're at right now. but there is a region you have to stay within, where that pinger did the first time, two miles, for two hours they heard this pinging sound and so i'm very confident that they found that...

Continuing to expand. putting it on the what you have level and the factual level, the pings are the same, the locations are the same, spread out about 17 miles, so that area still the find. it's no worse than it was two or three days ago. they just don't have anything to make it better. i really see they're pretty much in the same position and just waiting to put the submersibles in. and i expect that will come in a day or two. >> david, do you think that's a day or two away and how confident with all this information that keeps changing and yet today no press conference, because they don't k...