 It was decided to put together a salvage mission, and on June 1985 the Soyuz T-13 mission, in what was in the words of author David S. F. Portree "one of the most impressive feats of in-space repairs in history," managed to bring the station online again.The Soyuz T-15 mission was the last to visit Salyut 7 in 1986, ferrying equipment from Salyut 7 to the new "Mir" space station; This was so far the only ferry flight between two space stations.Aside from the many experiments and observations made on Salyut 7, the station also tested the docking and use of large modules with an orbiting space station.