Hikers cross frozen lake so clear it's as if they're walking on water

This is a cool video. Literally. Two hikers came across a frozen lake with ice so clear that it appears as if they are walking on water.

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Tomas Nunuk, from Slovakia, was hiking with a friend in the High Tatras Mountains on November 3. The pair changed course when conditions impeded their original route and came across the lake. Video of Nunuk standing in the crystal clear ice is both breathtaking and heart-stopping.