in the tail? >> i think there is one of them in the tail and one is further forward so that would be good news if they found the tail. now they can begin the process of recovering data from the cockpit voice recorder. >> because in terms of the investigation, these are the holy grails in terms of the search. they want to get their hands on those and find out the information they want and, of course as of now we don't have any sense that they're hearing any pings. >> no indication of that at all at this point, no. >> it was indicated by david gallo that there's a lot of shipping traffic so a lot of noise for those devices. >> towed ping locators as we mentioned for those of you that are sort of new to this we've learned a lot, certainly with mh-370. you've both taught us a lot. so they have the side scan sonars they also have these towedtow ed ping locators and it's important to talk about the acoustics of the ocean. it may not be very deep only 100 feet comparatively to some other portions of the ocean. this is fairly shallow. but there's still acoustic noise