NASA's Unexplained Files
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Secrets Underground
Friday, 05:00
American Stonehenge. Rob Nelson investigates the mysterious rocks at the bottom of Lake Michigan known as Underwater Stonehenge. Plus, the search for escape tunnels in Alcatraz. S1, Ep1
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The Moon That Disappeared. Newly discovered documents reveal NASA's secret plan B for failure of the first moon landing. And NASA's Cassini mission unravels a 300-year-old mystery. S3, Ep5
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