Searchers are listening for the "pings" emanating from beacons attached to Malaysia Airlines Flight 370's black boxes.
It's a challenging task, even in the best conditions.
Malaysia Flight 370: New signal sounds 'just like' one from a plane's beacon
Needless to say, searching the depths of the Indian Ocean for the high-pitched sound, is far from ideal.
A team of researchers took our Rosa Flores out onto the water to show her the kinds of challenges searchers are facing.
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