French and Spanish speleologists explore Europe's deepest caves for possibility of constructing underground hydroelectri

The video covers a Franco-Spanish cave expedition in the Pyrenees, highlighting a record descent and paying tribute to Marcel Lubin. It explores the majestic caverns and discusses the scientific and practical goals, including potential hydroelectric projects and geological studies. The expedition is portrayed as a blend of adventure and scientific inquiry, with modern explorers drawn to the unknown.

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