The men took up residence to conduct a variety of investigations as part of the 1956-57 International Geophysical Year (IGY) research program.
Siple, Tuck and the 16 other 'winterovers' were the first people in history to witness sunset and sunrise at the South Pole, events that are separated in Antarctica by six months of darkness and almost unimaginable cold. In the depths of the austral winter at the station, the temperature dropped to -77.2 Celsius (-107 Fahrenheit) on Sept. 18, 1957, the coldest temperature ever recorded on Earth at the time.
These men laid the foundation for the scientific legacy that continues into the 21st century, as the National Science Foundation dedicates the third permanent station at the South Pole in 2007.
Born in 1908, Siple—a biologist—was no stranger to Antarctica. In 1928 at the age of 19, Siple—an Eagle Scout and a representative for the Boy Scouts of America—would join the expedition of Adm. Richard E. Byrd to the pole. He spent many of his intervening years in the Polar Regions, eventually as the director of scientific projects for Operation Deep Freeze during the 1955-56 season, which laid the logistical groundwork for the existing system of U.S. scientific stations in Antarctica.
Siple and Tuck and their wintering group were not only the first to face the daunting isolation of a winter at the bottom of the world, but their scientific accomplishments provided a vital link in what otherwise would have been a 3,000 kilometer (1,800 mile) gap between IGY stations.
South Pole station was the first inland weather station in Antarctica, with weather balloons being sent aloft every 12 hours. The South Pole seismograph was unique among the 16 IGY seismic stations, sitting as it did atop the miles-thick continental ice sheet. Samples also were taken to measure the amount of carbon dioxide in the air. The scientific legacy of that first winter spent by Siple and Tuck and the others lives on because subsequent atmospheric and seismic instruments at the pole have produced some of the longest continuous measurements of natural phenomena in existence.
"When I had first considered going to the pole," Siple wrote, "I had questioned how much scientific work would actually be accomplished. I had felt it would require almost all the combined efforts of the stations' personnel merely to stay alive. So it was gratifying that, as things turned out, the results of our scientific endeavors were of a reasonably high order."
The quality of the IGY observations at South Pole and other Antarctic stations was enough to persuade the United States and other nations to continue their scientific programs in Antarctica. In 1961, the original station was officially named Amundsen-Scott South Pole Station, to honor the early Polar explorers and stress the international nature of Antarctic research.
The original station was last occupied in 1975 during the transition to the current Amundsen-Scott South Pole Station, under the iconic geodesic dome. The original station now lies buried, being crushed by the enormous pressure exerted by the ice sheet of the Polar Plateau.
Siple did not live to see the new station open. He died of a heart attack at his desk in 1968, at the age of 59.
—by Peter West