NASA's Unexplained Files Season 4 Episode 8 Mars's Deepest Secret ( Air Date 2016-10-18 ) Genre Documentary, Talk, Mystery category. Overview "British astronomers working for the CIA intercept Soviet photos of the moon. A malfunction on the ISS could poison its crew with ammonia gas. A startling image taken by a NASA probe points to evidence that life could exist on Mars.".
NASA's Unexplained Files Season 4 Episode 8 Mars's Deepest Secret
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