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"Deeper, Deeper, Deeper Still" is the sixth episode of the American documentary television series Cosmos: A Spacetime Odyssey. It premiered on April 13, 2014 on Fox and aired on April 14, 2014 on National Geographic Channel. The episode explores the smallest particles in the universe, where host Neil deGrasse Tyson "hunts for elusive neutrinos and the distant, early universe." The episode features the underground neutrino laboratory, Super-Kamiokande, located underneath Mount Kamioka in Japan.