This Horizon special episode is part one of a three part series on the projects, cosmonauts, and engineers involved in the Soviet Union space program.

This Horizon special episode is part two of a three part series on the projects, cosmonauts, and engineers involved in the Soviet Union space program.

This Horizon special episode is the last part of a three part series on the projects, cosmonauts, and engineers involved in the Soviet Union space program. In this episode, two Soviet cosmonauts risk their lives earlier this year in a dangerous space walk to try and repair their stricken craft.