In the 1950s and early '60s, a small band of high-altitude pioneers exposed themselves to the extreme forces of the space age long before NASA's acclaimed Mercury 7 would make headlines. Though largely forgotten today, balloonists were the first to venture into the frozen near-vacuum on the edge of our world, exploring the very limits of human physiology and human ingenuity in this lethal realm.

Cast:Michael Murphy, Burkhard Bilger, Scott Carpenter, Francis French, John Glenn, Cooper Gordon,

Genre:Documentary, History,

country:United States of America,

Production:Insignia Films,