Years after their initial conversation with the world's foremost expert on underwater explosions, Ben still sings the praises of Dr. Rachel "Big Spinach" Lance. In the first part of this special two-part series, Ben, Noel and Max welcome Dr. Lance back to learn more about the phenomenal -- and, frankly, inspiring -- story of a ragtag crew of rogue scientists who saved submarines ... and, in doing so, saved the Allies during D-Day.

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