National Geographic and Plimsoll Productions

Deadly icefalls hit Alex and the team as they make a first ascent of the 1,500-foot-high pool wall. Then, they set out on the first-ever crossing of the Renland Ice Cap, where they face snow storms and deep, deadly crevasses. After surviving a whiteout, they battle to get off the ice before traveling up an iceberg-filled fjord to get their first glimpse of the big climb: Ingmikortilaq