 This meant that the malfunction could not be examined and a new Spektar optoelectronic block had to be produced for future missions.It was later integrated with the rest of the equipment on Salyut 6 and the Bulgarian experiments were initiated in 1981 by Soviet cosmonauts.Despite the aborted mission, Bulgaria became the fourth Interkosmos country (after Czechoslovakia, Poland and East Germany, in that order) and the sixth in the world to send a citizen in space.