Ice drilling teams. Above: a team under Lonnie Thompson carrying equipment up Huascaran, Peru, the world's highest tropical mountain. Bringing ice cores back to civilization, still frozen, was a tremendous challenge. Below: extracting a 6-meter core segment from the drilling apparatus in subzero temperatures at the GISP2 site in Greenland.
GISP2: Compare the picture here of the 1960s Camp Century operation.
Photos National Oceanic and Atmospheric Administration Paleoclimatology Program/Department of Commerce, from NOAA site. Upper by Lonnie Thompson, Byrd Polar Research Center, The Ohio State University. Lower by Kendrick Taylor DRI, University of Nevada-Reno.