forbidding terrain. they train on icescapes like this. then descend into the depths of the coldest climates, braving perilous weatheronditions to reach people trapped in the most intimidating of landsces. guides on the ice, they've canceled hollywood too. keeping crews safe on blockbusters from "star wars" to "interstellar" and "game of thrones." we joined them right in the heart of this icy wonderland. >> walk up that wall of ice.