I love these sessions, I particularly like the moment when they realise that the walls disappear and they are hanging in space. From the line of flags which lines the snow covered hillside it's invisible. Even close up it appears as just a small hole in the ice. It's only when you're hanging from a rope at the top of a vast underground cavern that you realise why crevasses are something you would be wise to avoid. Giant icicles, tinged deep blue in places, hang the ten or so metres from the roof.
Smaller ones stretch, seemingly forever, in both directions through a deep corridor in the glacier.
Some of the ice is so clear as to be transparent, appearing like great columns of glass. Even though the only light comes from a small gap, it's as if all the walls are illuminated. To me its an ice palace. As I was standing at the bottom attached to a tube of metal screwed into the ice I could watch peoples' reactions as they slowly spun on a spiders web of rope descending in awe to a magical alien landscape of ice. Very difficult to photograph the scenery or to describe your feelings as you descend into the ice.