Biggest Cave Shaft in the World HD - Mexico

Cave of Swallows is a Pit cave in San Luis Potosí, Mexico - The entrance high point provides over 370 meters freefall drop to the bottom - The Cave of Swallows has the biggest cave shaft in the world ... Narrated by David Attenborough for BBC Television.

• 2009-11-25T23:11:40+00:00
• Duration: 01:41

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Keywords

caves, cave, bbc, swallows, mexico, wildlife, nature, zoos, attenborough, education, documentary, Potosí, pit, shaft