Frozen cave pictures by Paul Zizka/Aurora Photos (6 images)

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Daring climbers scale an illuminated ice cave while the night sky is lit by the stunning Northern Lights. The skilled ice climbers scaled the cave to the the top and used a headlight to create a mesmerising blue glow.

Beyond the cave, the night sky was ablaze with shades of green, red, blue and yellow from the spectacular Aurora Lights. These stunning photographs were taken by Paul Zizka, 37, at the Athabasca Glacier in the Columbia Icefields, Alberta, Canada.
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