Soyuz TM-30 (Russian: Союз ТМ-30, Union TM-30), also known as Mir EO-28, was a Soyuz mission, the 39th and final human spaceflight to the Mir space station. The crew of the mission was sent by MirCorp, a privately funded company, to reactivate and repair the station. The crew also resupplied the station and boosted the station to an orbit with a low point (perigee) of 360 and a high point (apogee) of 378 kilometers (223 and 235 miles, respectively). The boost in the station's orbit, which was done by utilizing the engines of the Progress M1-1 and M1-2 spacecraft, made transit between Mir and the International Space Station impossible, as desired by NASA. The mission was the first privately funded mission to a space station.

The mission was part of an effort by MirCorp to refurbish and privatize the aging Mir space station, which was nearing the end of its operational life. Further commercially funded missions beyond Soyuz TM-30 were originally planned to continue the restoration efforts of the then 14-year-old space station, but insufficient funding and investment ultimately led to the de-orbit of the station in early 2001.

Soyuz TM-30 was the first spaceflight for flight commander Zalyotin, who became a cosmonaut in 1990 and completed his general training two years later in 1992. TM-30 was the third visit to space made by flight engineer Kaleri, who became a cosmonaut in 1984 and completed general training in 1986. He served as flight engineer aboard the Soyuz TM-14 and TM-24 missions to Mir in 1992 and 1996-7, respectively.

The crew of the mission was sent by MirCorp, a privately funded company, to reactivate and repair the station. The mission was part of an effort by MirCorp to refurbish and privatize the aging Mir space station, which was nearing the end of its operational life. Further commercially funded missions beyond Soyuz TM-30 were originally planned to continue the restoration efforts of the then 14-year-old space station, but insufficient funding and investment ultimately led to the de-orbit of the station in early 2001.

Sergei Zalyotin and Aleksandr Kaleri reactivated the uninhabited station. The cosmonauts unloaded Progress M1-1, which resupplied the station. The Progress spacecraft was also used to raise the station's orbit to 360 x 378 km x 51.6 deg.
They started air pressure checks using the mano vacuum-meter (MVM) from the BO (life compartment of the Soyuz TM-30) and agreed upon the use of the same MVM for all pressure measurements. Measurements during April 07, 2000 gave valued between 625 and 619 MM Mercury. The accent was put on the work on the life support systems, like the replacement and installation of ventilators, the separation of a cooling loop to be able to purify this, work on the BKV, while on April 09. 2000 the Elektrons, the electrolysis oxygen generators, got the first attention. To make accurate pressure measurements in these parts of the complex possible, the SO (docking compartment at the Kristall module) and the Priroda were shielded off hermetically from other parts of the station. The crew had switched on one of the Elektrons, but this switched itself off.

From the beginning the Mir-28 crew was very busy with air-seal checks in several compartments and modules. This search was intensified on April 18, 2000 and April 19, 2000. The crew worked with special equipment, which had been brought to the station together with the present crew. They spoke about an instrument called Bar and a thermo-hygrometer. The cosmonauts had to disconnect cables in the PKhO (the transition section) to make it possible to close the hatches through which these cables are deployed. The co-ordination with TsUP during these activities was very good and all went well during this risky work.