 Salyut 1 was moved to a higher orbit between July and August 1971 to ensure that it would not be destroyed prematurely through orbital decay.In the meantime, Soyuz capsules were being substantially re-designed to allow pressure suits to be worn during launch, docking maneuvers, and re-entry.However, Salyut 1 ran out of supplies before the Soyuz redesign effort was concluded, and it was decided to fire the engines for the last time on 11 October, to lower its orbit and ensure prompt destructive re-entry over the Pacific Ocean.