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ac intv cooper cmdr william marks search effort_00003420.jpg
ac intv cooper cmdr william marks search effort_00003420.jpg

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    'Whole operation has been a challenge'

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'Whole operation has been a challenge'

U.S. Navy Commander William Marks updates CNN's Anderson Cooper on the search team's strategies to find Flight 370.

'Whole operation has been a challenge'

U.S. Navy Commander William Marks updates CNN's Anderson Cooper on the search team's strategies to find Flight 370.