black boxes, what do you use the bluefin for? >> the bluefin vehicles have been used for over 15 years. originally they were used for ocean graphic research. very first crews were done in an articca. used in the artic to study global climate change. used for alternative energy, offshore wind farms. >> it seems that we have lost the ceo. anyway, we thank him. australian searchers are calling the pings the most promising lead yet. we have heard that one before. are we really any closer to finding the missing plane? joining us underwater search expert coal leenel keller. hank whitmore and air safety investigator matt robinson. matt, we keep hearing about these pings are these picks something you can hear with the human ear or something different? >> it requires a hydro phone, greta. and it does sound a bit more like a chirp. a frequency that you can't
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