Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) – The clock is ticking on the signals from the flight-data and cockpit-voice recorders, known as "black boxes," of missing Malaysia Airlines Flight 370. The batteries for the recorders last about 30 days.
But even if the signals stop, investigators can conduct underwater searches using manned and unmanned vehicles.
Oceanographer Ian MacDonald, a professor at Florida State University, walks us through the new technology available to investigators.