 The third long-duration Salyut 6 crew deployed a 10-meter radio-telescope antenna delivered by an uncrewed cargo spacecraft.After Salyut 6 crewed operations were discontinued in 1981, a heavy uncrewed spacecraft called TKS, developed using hardware left from the canceled Almaz programme, was docked to the station as a hardware test.Some unconfirmed reports say that the station was functionally capable of even more missions, but combating the ever-increasing mold in living quarters was becoming impossible, and in practice caused the retirement decision.