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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鈥檚 one of the world鈥檚 largest cave shafts in the world and one of Mexico鈥檚 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鈥檚 one of the world鈥檚 largest cave shafts in the world and one of Mexico鈥檚 13 natural wonders.