Dark Summit tackles the topic of responsibility in mountaineering. Those who venture into this harsh environment know the risks: for every 5 climbers who reach the summit of Mount Everest, one dies. In the "death zone" above 25,000 feet, are individuals obliged to risk their own lives to help others? As technology and outfitters give less-experienced climbers greater access to the world's highest peaks, this question becomes more controversial. When attempting to aid a climber in distress may put your own life at risk, where do you draw the line?