Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.

In this April 9, 2014 photo provided by the Australian Defense Force, a Royal Australian Air Force AP-3C Orion flies past Australian Defense vessel Ocean Shield on a mission to drop sonar buoys to assist in the acoustic search of the missing Malaysia Airlines Flight 370 in the southern Indian Ocean. The ship searching for the missing Malaysian jet has detected two more underwater signals that may be emanating from the aircraft's black boxes, and the Australian official in charge of the search expressed hope Wednesday that the plane's wreckage will soon be found. (AP Photo/LSIS Bradley Darvill/Australian Defense Force/AP, LSIS Bradley Darvill) EDITORIAL USE ONLY
In this April 9, 2014 photo provided by the Australian Defense Force, a Royal Australian Air Force AP-3C Orion flies past Australian Defense vessel Ocean Shield on a mission to drop sonar buoys to assist in the acoustic search of the missing Malaysia Airlines Flight 370 in the southern Indian Ocean. The ship searching for the missing Malaysian jet has detected two more underwater signals that may be emanating from the aircraft's black boxes, and the Australian official in charge of the search expressed hope Wednesday that the plane's wreckage will soon be found. (AP Photo/LSIS Bradley Darvill/Australian Defense Force/AP, LSIS Bradley Darvill) EDITORIAL USE ONLY

    JUST WATCHED

    Search area tightens to smallest yet

MUST WATCH

Search area tightens to smallest yet

After detecting a 5th ping potentially from plane's black boxes, search area narrows further. CNN's René Marsh reports.

Search area tightens to smallest yet

After detecting a 5th ping potentially from plane's black boxes, search area narrows further. CNN's René Marsh reports.