View taken from behind of a hiker, equipped with crampons and emergency equipment, crawling through a blue ice tunnel formed in the Mendenhall Glacier. As the glaciers in southeast Alaska melt, ice is exposed thousands of years after being buried. Some tunnels in the 1,500-square-mile Juneau Icefield are connected to ice caves, which formed as the glacier moved across uneven surfaces; Mendenhall Glacier, Tongass National Forest, Southeast Alaska, Alaska, United States of America, by Melissa Farlow / Design Pics

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