Soyuz, Card No 31 (RaceIntoSpace 1971)
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Card No. 31: Soyuz
The three-part spacecraft – used to develop space station techniques – comprise a spherical experiment compartment, a re-entry module and a rocket-powered service module.
The experiment compartment, as well as allowing men to perform scientific and technological experiments (e.g. vacuum welding under weightlessness in Soyuz 6), can be separately de-pressurized to form an airlock allowing cosmonauts to emerge into space.
After docking two men transferred from Soyuz 5 to Soyuz 4 in orbit returning to Earth in a different craft.