NovaTemporada 21 Añadir imagenNúmero de episodio19Journey to the Sacred SeaOverviewNOVA 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.Air dateDecember 20, 1994Runtime (min)60