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cnn tonight bill weit submarine under water _00020309.jpg
cnn tonight bill weit submarine under water _00020309.jpg

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    Inside a manned submersible

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Inside a manned submersible

CNN's David Mattingly shares the challenges and advantages associated with searching the ocean floor for Flight 370

Inside a manned submersible

CNN's David Mattingly shares the challenges and advantages associated with searching the ocean floor for Flight 370