"Les Habitants des Flammes de Pierre" is the making-of documentary for the film "The Pillar of Solitude," which recounts Walter Bonatti's historic 1955 ascent of the southwest pillar of the Drus (the Bonatti Pillar) in the Mont Blanc massif, an 800-meter-high vertical face, climbed solo in six days, despite having only three. In the film, the renowned Swiss mountaineer Michel Vaucher portrays Bonatti. Unlike the film "The Pillar of Solitude," which was shot in black and white, the making-of documentary was filmed in color.