Mir EO-5

[3] However, in March 1989, the Soyuz spacecraft that was intended to be utilized for the mission was seriously damaged during testing in a vacuum chamber.

The cosmonauts attached a mooring post to the outside of the airlock compartment and removed a Kurs antenna so it could not interfere with future EVAs.

While on Mir, the crew took part in experiments in the fields of medicine, geophysics, space technology, earth observation, astronomy and materials sciences.

Procedures were developed to ensure the spacecraft maintained an appropriate temperature, and once ground control considered the situation manageable, the EO-5 crew returned to Earth.

[4] During their stay upon Mir, the crew completed 2631 orbits of Earth, and the mission in total lasted 166d 06h 58m from launch to landing.