
https://www.popsci.com/story/environment/glacier-microbes-rocks-food-life-space/
Portage Glacier (right), Burns Glacier (center), and Shakespeare Glacier (left) in Southcentral Alaska, seen from the air. (USGS, Alaska Science Center/)
In the darkness beneath glaciers, which range in thickness from less than a quarter mile to a full mile deep (or more), microbes cannot depend on sunlight for energy. Instead,