Ra [also known as The Ra Expeditions] is a 1972 documentary film directed by Lennart Ehrenborg and Thor Heyerdahl about the expeditions organised by Thor Heyerdahl in 1969 and 1970 in attempt to cross the Atlantic on papyrus boats. It was nominated for an Academy Award for Best Documentary Feature.

Explorer Thor Heyerdahl and his ten-man crew sailed their reed boat, the Tigris, over routes he believes were followed by Sumerian traders 5,000 years ago. The film goes beyond science to focus on the man, Heyerdahl, in an effort to explain what motivates him to risk his life in the search for knowledge.

In 1971, American Norman Dyhrenfurth led an expedition of 30 climbers from 13 different countries, including Don Whillans, Dougal Haston, Naomi Uemura, Pierre Mazeaud, Michel Vaucher, and others. This expedition aimed to simultaneously climb the southwest face and the direct west ridge. During the ascent, Indian climber Harsh Vardhan Bahuguna perished at Camp 3 in a storm. The expedition, already suffering from organizational problems, was severely tested after his death. The Americans decided, unilaterally, to abandon the west ridge. The Europeans, who had spent days equipping the route, were left out and felt relegated to the roles of route setters and porters. Frenchman Pierre Mazeaud, Swiss climbers Michel and Yvette Vaucher, and Italian Carlo Mauri then left the expedition. The Americans continued their ascent of the southwest face up to 8,350 meters before giving up.