If the ice sheet covering Greenland melted, global sea levels would rise 21 feet (7 meters), profoundly impacting our planet. How, why, and when could this happen? A few years ago, scientists found lost sediment from a secret sub-ice Cold War base in the Arctic from the 1960s that holds clues to a time when Greenland Ice Sheet was gone. The Memory of Darkness, Light, and Ice is an hour-long documentary about the discovery of this sediment and the critical implications of the science to our future.