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Lot, lot smaller. how much smaller is it based on the fact that those pings were found about, what, 17 miles apart? >> well, you know, we're giving the towed pinger locator a 1 to 2 mile detection range and actually it might be a little bit manufacture because of the altered frequency that we're hearing. the water actually absorbs that energy less, so the sound can travel farther. so maybe the tpls can see quite a bit differently farther than we expected. but at any rate, let's say you gave it maybe twice the detection range so they could see 5 miles, then the pings we have detected are 17 mil...

Equipment used to locate the pings. if the box goes dead, they will switch to a sonar search for identify what is consistent in size and shape with flight mh370 black box's. >> when the acousting beacons are no longer emitting we will switch to a sonar search for with a shorter detection range and tough processes. and whether we locate it or not with the toad pinger the area we are in will be a high area we will conduct the sonar search. >> reporter: that is the last step, but there is a willingness to do that. >> when and if they bring up the

Salinity and has the effect of attenuating, bending, sometimes 90 degrees of sound waves. it's quite possible for sound to travel great distances, but be very difficult to hear near the surface of the ocean, for instance. so it is a markedly different environment to what you see with sound traveling through air and it's a very specialized skillset that is being employed at the moment. in terms of the towed pinger locator, we're expecting around a 2,000 yard detection range, so you can picture now moving 3 knots through the water or 5 kilometers per hour with a detection range of around 2 miles...

Travel great distances laterally, but be very difficult to hear at the surface of the ocean. it is a remarkably different environment with what you see with sound traveling through air. and it's a very specialized skill set that is being employed at the moment. in interpretation of the towed pinger locator, we're expecting around a 2,000 yard detection range. so you can moving through or 5 kilometers an hour with a detection range of around two miles. that's a very small piece of the area being searched. ocean shield at the moment is on a fifth leg of a search that is an expanding square aroun...

The signal strength will become less which means that the range will start to decrease. >> okay. the detection range starts to decrease. all important information. so i want our panel to ask you some questions, jeff, but first, let's go ahead and get their take on these latest developments. with us now cnn aviation correspondent richard quest, analyst miles o'brien, and cnn an looalyst david gallow is on phone with us. at the director of special projects at woods hole oceanic institution. what do you make about these pulses the chinese state media is reporting about. we sort of learned not to ...