Although the base of the mountain (from the Godwin-Austen glacier) is a sight to behold, (as it is from the Gasherbrum Glacier), getting to that point is comparatively hazard-free. Ascending to the summit - only attempted by the most fit and experienced climbers - is marked by both obvious and hidden dangers.

Constant snow cover completely masks openings to ice caves and crevasses. Even the most seasoned climbers can fall into a crevasse or cave without warning. (The links take you to a snow pictures - from the stunning perspective of a scanning electron microscope.)

Vittorio Sella, the renowned Italian mountain photographer, took the first pictures of K2 and its pitfalls. It was 1909. Sella had previously ordered a special camera weighing 40 pounds to record what he found. Such scenes as 1888's Crevasse on the Glacier Blanc, although not taken on K2 itself, demonstrate the perils of a crevasse.

Ice caves (follow the links to good examples located in Iceland) can be even worse because of their size. Caverns, they can be unmanageable for climbers to exit without rescue. And rescue, on K2, may not always be possible.