The Salyut-6 was a Soviet space station launched in 1977. Orbiting earth for nearly five years it arguably was the most successful station of its program.
It revolutionized the design of the earlier civil Salyut stations by adding a second docking port. This made crew handovers and resupply mission possible for the first time.
From 1977 to 1982 the station also hosted several non-Russian cosmonauts as part of the Interkosmos program. Some of these countries were Czechoslovakia, East Germany, Vietnam, Mongolia and Cuba.
After deorbiting in 1982 the station was replaced by the more advanced Salyut-7.
The model uses the same core model as the Salyut-7. Overall the model has a medium difficulty.