Soyuz 11 was a manned space mission. It was the only mission to live on Salyut 1, the first space station. It was a backup mission of Soyuz 10, which was failed to dock. The mission killed three men in space when it lost air pressure during re-entry of the atmosphere. They were Georgy Dobrovolsky, Vladislav Volkov, and Viktor Patsayev.