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we have completely lost sight of the northern arc. once the malaysian prime minister made the famous 10:00 p.m. announcement that they determined it was the south, we really stopped looking at the north all together. i heard that malaysia had asked kazakhstan if they could set up a search facility up there. i haven't heard back about it. so, great question. >> mary, question from dale. it says why not drop pinger in area to calibrate detected pings. we know the ocean can play tricks on sounds. should they put a pinger down to see how pings are manipulated in that part of the ocean? >> absolutely they should do that. they should do that and also put a pinger down that is losing the battery to see if it goes from 37.5 to 33.5 to see if the degradation is right and see how far it can travel. can it travel 17 miles to the site. that's a great suggestion.