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'Million-year-old' grotto discovered in Norway

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'Million-year-old' grotto discovered in Norway
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A group of friends in northern Norway has discovered a grotto believed to be around a million years old.

The 3.7 kilometre long labyrinth shows no trace of human activity.

An air shot, taken four years ago pushed the group to search for the grotto, which is thought to be the world’s longest so far north.