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Objects as small as a basketball. during a phone call this more than the malaysian defense minister asked defense secretary chuck hagel for sophisticated underwater surveillance equipment, such a hydrophones, a form of passive sonar. pentagon has budgeted $4 million for the mission. >> let's assume the plane is never fought. can investigators ever get to the bottom of what really happened if they never really get any pieces of the plane? we have a retire ntsb investigator and now he's saying it's tough. >> gets tough. the physical evidence has to be found. you have to find a wreckage or find t...

Underwater, a form of passive sonar. five surveillance aircraft will continue their search at dawn, shep. >> shepard: jennifer griffin at the pentagon. >> daniel stacy joins us right now, from the headquarters of the search operation in australia. what's been happening there, daniel? >> well, shep, it's been a number of vessels, even civilian vessels which are scrambling to join the search. today i was down at the docks seeing a chinese icebreaker that normally used to do research in ant arctic could, and it was rapidly restocking and heading back out to sea to get to the search area. >> you f...