Caves can form within glaciers as a result of water running through or under a glacier. They are often called ice caves, but the term more accurately describes caves in bedrock that contain ice throughout the year. Water usually forms on the glacier’s surface through melting, before flowing down a moulin (vertical to nearly vertical shafts within glaciers or ice sheets) to the base of the glacier. Glacier caves can also form as a result of geothermal heat from hotsprings or volcanic vents beneath glaciers, such as the Kverkfjöll glacier cave in Vatnajökull glacier in Iceland, or where glaciers meet a body of water, with wave action.
Glacier caves can collapse or disappear because of glacier retreat. For example, the Paradise Ice Caves on Mount Rainier in Washington had 8.23 miles of passages in 1978. However, it collapsed in the 1990s, and the section of the glacier that contained the caves retreated between 2004 and 2006. Prior to collapse, caves can be used to access the interior of glaciers for research purposes, with the study of glacier caves sometimes known as glaciospeleology. Others also serve as popular tourist attractions due to their beauty.
“Glacial Balance,” A New Documentary by Ethan Steinman on Climate Change
“Water and its sources have historically been the key factor in the establishment of cities, of civilizations. But we are at a critical point in the environment and mankind’s existence. . . GLACIAL BALANCE takes us to Colombia, Argentina, Chile, Bolivia and Ecuador, getting to know those who are the first to be affected by the melting glacial reserve.”
“Requiem of Ice” Amazing Timelapse Video Shows Melting of the Largest Glacier Cave in the Country
“The cave systems have been mapped and surveyed since 2011 by Brent McGregor and Eddy Cartaya of the Oregon High Desert Grotto and in that time they have discovered more than a mile of caves and passages beneath the Sandy Glacier.”
A team from Uncage the Soul Productions shot “Requiem of Ice” in two caves named Pure Imagination and Snow Dragon, demonstrating the effect of the changing landscape.