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Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.

Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.

On the Next Episode of The Lead

Journalists Carl Bernstein and Bob Woodward on the death of legendary news editor Ben Bradlee.

Journalists Carl Bernstein and Bob Woodward on the death of legendary news editor Ben Bradlee.

March 24th, 2014
05:46 PM ET

Listening for missing plane's flight recorder 'pings' underwater

(CNN) – The Malaysian Prime Minister announced Monday that Malaysia Airlines Flight 370 is likely in the southern Indian Ocean, and that all on-board have perished – which pushes the search under water.

Signs of possible debris have ramped up over the last few days, but even if any are confirmed to be a part of the plane, that doesn't necessarily ease the search for wreckage.

The U.S. Navy has announced it has requested that a "Towed Pinger Locator System" be moved into the area to help find the flight recorder, a listening device put in the water to pick up the "pings" of the recorder, although they stress it's not really useful until you have a debris field.

Oceanographer Ian MacDonald, professor at Florida State University, explains.

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