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Investigators must turn to 3D technology to determine why two float planes carrying tourists collided above a spectacular Alaskan waterfall. (National Geographic)
Galerie (5)
Foto © National Geographic Channel
![Mayday - Without Warning - Van film](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/504/168504724_3rsmox.jpg)
Foto © National Geographic Channel
![Mayday - Without Warning - Van film](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/970/168970254_rponvj.jpg)
Foto © National Geographic Channel
![Mayday - Without Warning - Van film](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/504/168504725_fw9mzb.jpg)
Foto © National Geographic Channel
![Mayday - Without Warning - Van film](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/504/168504726_73niqv.jpg)
Foto © National Geographic Channel
![Mayday - Without Warning - Van film](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/504/168504727_w7ef4p.jpg)