From the surface, glaciers look like solid masses of snow and ice, broken only by the occasional wrinkle and fissure. Beneath that top layer of ice and snow, however, lies a complex network of channels and openings, created by the flow of water, ice, and air.
Sometimes, these forces combine to create large openings. These glacier caves can last a few days or a century, and are difficult and dangerous to explore.
Photographer Eric Guth has traveled the world to find these caves, photographing them for those that may never make the cold trip themselves.
Photo: Eric Guth