Alex Honnold Climbs a 4,000 Foot Sea Wall | Arctic Ascent

Alex Honnold, a rock climber famous for his free solo ascents, and a team of expert climbers and scientists reach the final phase of their epic expedition - A 4,000 foot sea wall called Ingmikortilaq, one of the biggest unclimbed rock faces on the planet, and one of the most important glaciers in...

49 min - Adventure & Extreme - National Geographic

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