Melting polar ice caps is not new news. However, the scare factor got upped when Nasa’s Earth Observatory published a Greenland map, featuring a subterranean secret. Under the ice lurks a former US. base. Camp Century was part of a project designed to create mobile launch sites for medium-range nuclear ballistic missiles. The site contained housing, recreation and medical facilities, all powered by a nuclear reactor. Mapping done by NASA reveals color coding, where melting is anticipated to be speediest, showing how the camp could be exposed before the century runs out.