Old fears surface when the remaining astronaut candidates face a series of space agency swim tests. Their teamwork and mental agility is scrutinised in an underwater test, assembling a large cube. They learn basic Russian before heading off to the German Space Centre. In a simulation used to train astronauts, they attempt to dock the Soyuz space capsule with the International Space Station. They are subjected to a spin in the facility's rotating chair and more candidates are sent home.

Originally released by BBC Worldwide Learning, 2017. Streaming video file encoded with permission for digital streaming by Infobase on November 21, 2019.