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Australians who would examine them frame by frame, pixel by pixel. >> if the currents are strong and the ocean is choppy, how do you distinguish between white caps and a crucial piece of debris? >> if you have a white cap like that it's much more difficult to identify a piece of debris. it will determine more attention and more eye balls to make those distinctions. >> reporter: what's making the search difficult is that the water was choppy. after the pictures were taken there was low visibility and rough seas. brian todd, cnn. as the u.s. ramps up sanctions on russia, officials in both coun...

With potential adversaries, for example. >> reporter: why did it take four days for the pictures to go public? brown says digital globe would have first had to download them then send them via satellite to their colorado labs, process then in different formats then send them to the australians who would examine them frame by frame, pixel by pixel. if the currents are strong and the ocean is choppy, how do you distinguish between white caps and a crucial piece of debris? >> if you have a white cap like that it's much more difficult to identify a piece of debris so it requires just more attentio...