Alex Honnold Climbs a 4,000 Foot Sea Wall (Full Episode) | Arctic Ascent | National Geographic

National Geographic follows Alex Honnold and a small team as they attempt Ingmikortilaq, a roughly 4,000‑foot sea wall on the Renland Ice Cap in eastern Greenland. The film documents an expedition to one of the largest unclimbed rock faces in the Arctic — approach, hauling, route‑finding and anchor building in remote polar conditions — and makes the logistics and objective hazards of a big‑wall alpine sea face the central story. The episode also records a scientific program alongside the climb: glaciologist Heidi Sevestre works with the team to collect field measurements and observations about the surrounding glaciers and ice cap. That interplay — a climbing expedition doubled as a platform for glaciological data collection — is the film’s main value, showing how technical climbing operations can be used to access and document rapidly changing polar environments.