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(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.