Air bubbles trapped in frozen lake by Robert Postma (15 images)

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Air bubbles trapped in the ice of a frozen lake create amazing patterns which look almost alien.

Incredible images show the phenomenon in which ice slowly engulfs air as it tries to escape the lake, turning them into frozen pockets beneath the surface.

As the lake freezes deeper and deeper, more bubbles form beneath each other, creating the strange patterns in the crystal clear ice.
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