Behind Russia's Frozen Curtain explores the stark landscape, frigid sea, and wild animals in Franz Josef Land, one of the most remote and inhospitable places on Earth. National Geographic Pristine Seas Explorer-in-residence Enric Sala leads a group of scientists and adventurers on the first international scientific expedition to Franz Josef Land. From diving in subzero temperatures to running away from polar bears to avoiding titanic icebergs, the Pristine Seas team faces some of its most dangerous challenges to date.