Space station

Salyut 1 marked the first space station intended for long-term human habitation. Three Soviet cosmonauts were found dead on board when Soyuz 11 returned to Earth because of air loss in the cabin.
 (Roscosmos) Russia 1971 Space station

Salyut 1 marked the first space station intended for long-term human habitation. Three Soviet cosmonauts were found dead on board when Soyuz 11 returned to Earth because of air loss in the cabin.