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Watch NOVA Season 21 Episode 19 Online

  • 6.9/10
  • COUNTRIES: United States of America
  • Subtitles: English

NOVA travels to Lake Baikal, the world's oldest and deepest lake, containing one-fifth of all the fresh water on Earth. Investigating Baikal from above, below and all around, NOVA charts its dramatically changing environment over the course of four seasons.