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Nazi Attack on America Preview
Long before 9/11, a far deadlier, little-known attack from the ocean depths struck our shores, lasting three-and-a-half years and claiming 5,000 lives. Now, famed undersea explorer Bob Ballard, discoverer of the Titanic, investigates the wreck of one of the attack craft, a German submarine that lies at the bottom of the gulf just a few miles off New Orleans.
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New evidence sheds light on the remarkable life—and mysterious collapse—of the ancient jungle city.
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What if violent asteroid impacts actually jump-started life on Earth? Explore a dramatic theory.
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53:41
See how ingenuity and teamwork keep the crew alive and doing science 250 miles above Earth.
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Astronauts and Mission Control relive terrifying moments during construction of the ISS.
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Find out why deadly flash floods are on the rise and how we can protect ourselves from them.
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Explore mysterious 9,000-year-old Stone Age megastructures found in the Arabian Desert.
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Discover how two revolutionary ancient inventions changed the course of humanity forever.
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Discover how Homo sapiens outlasted Neanderthals – and how they helped make us who we are today.