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American cavers were first to descend the 1,200-foot deep Sotano De Las Golondrinas, better known as the Cave of Swallows, in 1966. It’s one of the world’s largest cave shafts in the world and one of Mexico’s 13 natural wonders.
American cavers were first to descend the 1,200-foot deep Sotano De Las Golondrinas, better known as the Cave of Swallows, in 1966. It’s one of the world’s largest cave shafts in the world and one of Mexico’s 13 natural wonders.