In Carlsbad Caverns National Park, this isolated pool of cave water is completely untouched by humans.
Found in the Lechuguilla Cave network in New Mexico, the pool is about one foot wide, two feet long and several inches deep.
The water is actually clear and may be ancient rainwater that filtered down the caves limestone 700ft.
The edges beneath this pool appear to be ‘pool fingers’, which could be bacterial colonies that have evolved entirely without human presence.