They ascend that damn thing with ice picks and all — and all those ice climbing tools appear necessary. Lying flat against the wall is basically the only manner in which they lose what little traction they have.
This is one of those situations where going up looks much, much easier than returning the way they came. Do they know they have to go back down?
I hope there is a big ol’ cup of hot cocoas with extra marshmallows waiting at the bottom — one way or another they’ll make it there.