Scientists now have a clearer picture of Camp Century, an abandoned U.S. military base long hidden under the ice in Greenland, thanks to a NASA research team's good luck.

"We were looking for the bed of the ice and out pops Camp Century," NASA scientist Chad Greene said after spotting the secret city and Cold War relic in Greenland. Greene and his team were flying over the Greenland Ice Sheet in April,

NASA has released images of a nuclear military base built 30 meters below the ice cap, whose existence had been completely forgotten. During a flyover in an autonomous aircraft, scientist Chad Greene detected an anomaly deep within the ice.