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View of a glacier cave (R) of the Perito Moreno Glacier located at Los Glaciares National Park, southwest Santa Cruz Province, Argentina, on March 9, 2016. With 250 km2 ice formation, and 30 km in length, the Perito Moreno is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes mountain range. AFP PHOTO / Walter DIAZ / AFP / Walter Diaz (Photo credit should read WALTER DIAZ/AFP via Getty Images)

View of a glacier cave (R) of the Perito Moreno Glacier located at Los Glaciares National Park, southwest Santa Cruz Province, Argentina, on March 9, 2016. With 250 km2 ice formation, and 30 km in length, the Perito Moreno is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes mountain range.   AFP PHOTO / Walter DIAZ / AFP / Walter Diaz        (Photo credit should read WALTER DIAZ/AFP via Getty Images)

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Travel in Los Glaciares National Park in the province of Santa Cruz, Patagonia Argentina 8 January 2009. (Photo by Javier Escobar/NurPhoto via Getty Images)

Travel in Los Glaciares National Park in the province of Santa Cruz, Patagonia Argentina 8 January 2009.
 (Photo by Javier Escobar/NurPhoto via Getty Images)

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Ice cracks from the wall of the Perito Moreno Glacier located at Los Glaciares National Park, southwest Santa Cruz Province, Argentina, on March 10, 2016. With 250 km2 ice formation, and 30 km in length, the Perito Moreno is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes mountain range. AFP PHOTO / WALTER DIAZ / AFP / Walter Diaz (Photo credit should read WALTER DIAZ/AFP via Getty Images)

Ice cracks from the wall of the Perito Moreno Glacier located at Los Glaciares National Park, southwest Santa Cruz Province, Argentina, on March 10, 2016. With 250 km2 ice formation, and 30 km in length, the Perito Moreno is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes mountain range.   AFP PHOTO / WALTER DIAZ / AFP / Walter Diaz        (Photo credit should read WALTER DIAZ/AFP via Getty Images)

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Ice calves from the wall of the Perito Moreno Glacier located at Los Glaciares National Park, southwest Santa Cruz Province, Argentina, on March 9, 2016. With 250 km2 ice formation, and 30 km in length, the Perito Moreno is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes mountain range. AFP PHOTO / Walter DIAZ / AFP / Walter Diaz (Photo credit should read WALTER DIAZ/AFP via Getty Images)

Ice calves from the wall of the Perito Moreno Glacier located at Los Glaciares National Park, southwest Santa Cruz Province, Argentina, on March 9, 2016. With 250 km2 ice formation, and 30 km in length, the Perito Moreno is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes mountain range.   AFP PHOTO / Walter DIAZ / AFP / Walter Diaz        (Photo credit should read WALTER DIAZ/AFP via Getty Images)

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Ice cracks from the wall of the Perito Moreno Glacier located at Los Glaciares National Park, southwest Santa Cruz Province, Argentina, on March 10, 2016. With 250 km2 ice formation, and 30 km in length, the Perito Moreno is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes mountain range. AFP PHOTO / WALTER DIAZ / AFP / Walter Diaz (Photo credit should read WALTER DIAZ/AFP via Getty Images)

Ice cracks from the wall of the Perito Moreno Glacier located at Los Glaciares National Park, southwest Santa Cruz Province, Argentina, on March 10, 2016. With 250 km2 ice formation, and 30 km in length, the Perito Moreno is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes mountain range.   AFP PHOTO / WALTER DIAZ / AFP / Walter Diaz        (Photo credit should read WALTER DIAZ/AFP via Getty Images)