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As the Athabasca Glacier ice melts, water runs off along the surface in little streams. Occasionally, it will drill into the ice with the aid of some fast-moving rocks and grit, and plunge down through the glacier until hitting another stream layer (or bedrock) below. The tubular holes are called glacier mills, or moulins. A few people fall into them accidentally, which is a death-sentence. Our glacier walk guide told us that in some places, well-prepared divers will go into mills on purpose to explore below the surface of millennia-old glaciers!

Copyright © Royce Howland. All rights reserved.

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