An extraordinary cave network, never seen by human eyes, has been discovered in the depths of a US national park.The eerie blue pool network has been described as a "wonderous sight" by park employees at the Carlsbad Caverns National Park in New Mexico.It followed an expedition into what are called "virgin" cave passages in the park, long renowned for its complex cave structures filled with wax-like stalactite rock formations.Now explorers have discovered something uniquely remarkable – an isolated pool of milky-blue water untouched by humans, 700ft below ground.Carlsbad Caverns announced the discovery on Facebook this week, calling the site found within Lechuguilla Cave “completely pristine”.Geoscientist Max Wisshak, who led the expedition.
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