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Clip: Season 45 Episode 5 | 4m 14s
Churchill launches the largest military evacuation in military history. But there's a secret killer in the waters.
Aired: 01/24/18
Video has closed captioning.National corporate funding for NOVA is provided by Draper. Major funding for NOVA is provided by the David H. Koch Fund for Science, the Corporation for Public Broadcasting and PBS viewers.
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