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60 miles from last known location in the air of this plane, which raises the possibility of a very large debris field. so does that make it clear that there is still a lot of work to be done before you can start reliably putting something in the water, a hydrophone and come to find where the black box is? >> correct, jim. good evening jim and richard. here is a pinger. this is a typical -- typical of the one installed on the aircraft in question. the range of these pingers is like you said about two miles in great or perfect sea-state conditions. so you are talking about not a lot of chop and ...

Going about 150, and even though there's bad weather out there right now, had he will get that wreckage. i understand they think they may have spotted it even upside down, but if it's integral, the black boxes will be in the tail. that's where they're located, and they can with stand the shock of hitting the water and there will be a pinger that's activated as soon as the recorders are under water but not before that. the pingers will begin to sound, and they will -- they have a good long life so they will be pinging. they do require a very special receiver, however. people may not know that. ...

Acoustic listeners in the water. i would consider night operations they can launch the big ships and work at night and run from the weather during the day and at least start looking for the pinger on a clock that's ticking >> they have a general idea of where the plane went down. i understand that sonar is on its way from singapore. it's not there yet. have to wonder why isn't it there yet? >> that's in question if they've seen the plane or not and frankly when you take sonar images you take long range pictures to narrow it down. the imaging is not extremely detailed. could be a world war ii w...

Debris site if the pinger can't find it. this emits sound. >> reporter: like hydrophones, sonars work better in very deep water. but coleman says in shallow water, the search can move along more quickly. sonar is just showing us what's at the bottom, right? >> exactly. it's emitting that sound. as the sound comes back off the bottom, it's interpreting it to draw a 3-d image of what's on the sea floor. and it also generates a top-down image. >> reporter: that imagine will help investigators mark the debris field so the process of salvaging as much of the plane can begin. stephanie elam, cnn. >>...

The vast majority of it containing technology that supports the brain buried deep within. surprisingly small, but containing everything neil campbell needs on a handful of computer chips. in a box this big, that's what you need sp >> that's the crucial portion. >> let's bring our guests back in. we have tom fuentes, david sousi, and miles o'brien. miles, when we were back in march, there was this urgency about flight 370, finding the black box before the battery on the pinger went out. here you have more shallow water, so is there as much urgency to find that black box? >> 30 days is 30 days. ...