The documentary tells the story of Gus Grissom, Ed White and Roger Chaffee, who died after a fire erupted in their spacecraft on the launch pad.

Mercury/Gemini: The first space suits were modified U.S. Navy jet-aircraft pressure suits. Neoprene-coated nylon lined the inside; aluminized nylon covered the exterior. Apollo: Custom-tailored ...

Space exploration has been marked by tragic disasters, such as the Apollo 1 fire, Soyuz 1 and 11 accidents ... Since they had no pressure suits, they lost consciousness in seconds and asphyxiated.