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Using tags attached to the animals, cameras in the deep ocean trenches and 3D scanning images, this film illustrates a modern scientific revolution. (National Geographic)
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Photo © ARTE France
![Marine Mammals: Champions of the Deep - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/162/481/162481846_198807.jpg)
Using tags attached to the animals, cameras in the deep ocean trenches and 3D scanning images, this film illustrates a modern scientific revolution. (National Geographic)
Photo © ARTE France