Wolf Blitzer delivers the most important breaking news and political, international, and national security stories of the day. Tune to The Situation Room weekdays 5-7pm ET on CNN.
More than 20 days after MH370 went missing, search teams have still not discovered any sight of debris in the southern Indian Ocean - and many are now questioning if the plane parts might have sunk, making the search that much more difficult. CNN's Rene Marsh examines whether such debris from a plane would normally sink or float.
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