Signals detected by teams scouring the Indian Ocean for wreckage from flight MH370 have to be from a plane, an expert has told Sky News. Chris Bellamy, Professor of Maritime Security at the University of Greenwich, has said it is "very difficult" to think what else the pings picked up by a Chinese ship could be. "That is the frequency of an aircraft black box. Ships have black boxes, but that’s at 400kHz-15kHz, so quite a different range of frequencies.
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