The Mendenhall Ice Caves in Alaska are ancient ice formations that have existed for thousands of years, glowing a vivid blue due to the density of glacial ice that removes air bubbles and allows only deep blue light wavelengths to penetrate. However, these caves are disappearing rapidly as the Mendenhall Glacier retreats at an accelerating rate, with scientists estimating they may be completely gone within 20 years, potentially making this the last generation to witness them.
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Mendenhall Ice Caves Alaska: Glowing Blue for Thousands of Years. Gone Within 20.Added:
Beneath a glacia in Alaska, there are caves made entirely of ice that glow blue from the inside. They've existed for thousands of years. In 20 years, they may be completely gone.
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