I call these 'water tubes' because they resemble lava tubes. Once upon a time this ice, and this tube, was farther up the glacier valley buried deeper beneath glacial ice. Water ran through this tube, under the thick ice above it. I now look at glaciers and see a mass of ice that most likely contains an unseen network of tunnels draining water from the melting surface downward and down-glacier. Photographer: Bill Eichenlaub