Battling subzero temperatures and forty-foot seas, an international team of scientists embark on a perilous winter expedition into the darkest regions of the Arctic. Their mission: to understand how trace amounts of light may be radically altering the mysterious world of the polar night. What they discover has implications for the global climate and the future of the Arctic. Into the Dark brings viewers into a space on this planet where very few people have ever been - the polar night- to show them how tiny changes can lead to large impacts. In this case, how tiny changes in light can alter an ecosystem. But, in a broader sense, how a tiny molecule - carbon dioxide - can alter a planet.