In April, while flying a plane over the Greenland Ice Sheet, NASA scientists made a surprising discovery with radar: an abandoned Cold War-era military base consisting of a network of tunnels carved into the ice. NASA has released a photo from 1950. @CBS: bit.ly/4iLerEE National Snow and Ice Data Center Mission Antarctica by @MissionAntarctica A @grttme project - Other backups: @Hallotme