CNN At This Hour With Berman and Michaela March 31, 2014 15:25:00
Atlantic. brian, you had a rare look at how this was made. >> that's right. we went to the headquarters of phoenix international where the towed pin to towed pinger was located. it would tow the pinger several miles each way. it can go down as far as 20,000 feet below the surface. its sole mission is to listen for the pinger. we have a pretty good analogy of how it works. >> think of your cell phone ringer. if you lose your cell phone, you can call it and you hear the phone ringing so you narrowed down your search. >> the pinger locator does not tell you which direction to look in but it does ...