NASA's Unexplained Files Season 6 Episode 6 Secrets of the Alien Signals ( Air Date 2019-05-16 ) Genre Documentary, Talk, Mystery category. Overview "When NASA begins a strange experiment to communicate with dolphins, experts investigate if it's a prelude to making alien contact. But some fear that such a discovery could have apocalyptic consequences.".
NASA's Unexplained Files Season 6 Episode 6 Secrets of the Alien Signals
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