Kerning Cultures Network - In our latest episode, Toufic Abou Nader makes a journey to the bottom of the deepest cave in the world. For perspective, we made this map of that
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Veryovkina Cave - Wikipedia
Krubera Cave Article, Cave Exploration Information, Cave Expedition Facts -- National Geographic
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In Deep: The World of Extreme Cavers | The New Yorker
A 'Blind Descent' Into The Deepest Caves On Earth : NPR
How Australia's deepest cave was discovered | CNN
