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Equipment now, most of the time we are using auv, on the air france flight we were using auv because the topography was better for towing sonar. but auv is a carrier, also, the so sonar, the same kind of equipment. that is the only way to see something under water because you don't care about the light, if it is dark or not with the sonar. you don't need any light. and you have the swab, which could be pretty big, much bigger than the towing sonar, the auv, more power, the battery cannot give the same power than you can get from a surface ship. and that is different. erik do you think they sho...

That long. moving on to a look what is actually looking for the black box. you have a surface ship, in this case an australian ship, towing the t.p.l., the towed pinger locator. the depth that it is being towed at, about two miles from two miles underneath the surface, that's how far this thing is underwater, under the surface of the water. and it will sweep back and forth, the surface ship will, in paths that are approximately two miles apart. it is an incredibly slow process and it's so far not yielded an exact fix on where those black boxes might be sitting. with more on the search, let's b...

Done? dropping of an anchor where they would have heard that site? how do they get others to duplicate that path? >> a great question. it matters how the chinese located -- we're giving a haven't gender location, 1010 degree 1010 -- 101 degrees west. 257 degrees south, something like that. and you know, i don't know if they dropped a, if they got that through gps. it's one thing to know where the surface ship is nap they were towing some sort of listening device, you've got to know where that is and that could easily be a mile or more away from the surface ship. depends where they were and if ...

How do other conditions impact the underwater search that would take place? >> well, now, of course, you're talking about towing this from a surface ship. so the surface ship is not only going to be affected by the winds, but they're going to be affected by the seas. and, again, as i think your bureau of australian meteorology guest mentioned earlier, the seas down here are pretty challenging. today, it looks like a pretty good day. a pretty good day means seas like about 7 feet. so from your floor to the ceiling of your average living room. they're going to pick up and come up to about 10 to ...

Surface ship has been able to locate them. >> that's the frustration for searchers. they know the time is running out to find the flight data recorders. the pings they send out will start fading over the next few days. the batteries will end up dying after 30 days. retired lieutenant michael kay is back with us. alongside him is christine denison. she is an ocean explorer and logistics expert. >> i want to start with you about this new potential discovery. 122 pieces of possible debris or at least objects spotted in an area a lot smaller than we have been dealing with in the past, about 400 sq...