On June 8, 1985, cosmonauts Vladimir Dzhanibekov and Viktor Savinykh manually docked with Salyut 7, which had drifted silent and powerless for nearly four months. Inside, they worked by flashlight in winter coats and fur-lined hats, restoring the station system by system while frost covered its walls and equipment—and kept the wall heaters off until it evaporated, fearing meltwater would destroy the electronics.

When Soyuz T-13 reached Salyut 7 on 8 June 1985, the station could not assist with the rendezvous. It had stopped communicating with Soviet mission control in February, its batteries had discharged, and its attitude-control system was no longer holding it steady. Commander Vladimir Dzhanibekov and flight engineer Viktor Savinykh therefore approached and docked manually with a vehicle that was dark, cold and electrically dead.

The successful docking is often treated as the climax. It was really the beginning of a slower and less visible emergency. The crew had to establish that the station still held breathable air, identify the electrical failure, restore power without overloading the surviving batteries, and warm an interior whose frozen moisture could damage the very equipment they were trying to revive.

That last problem explains one of the mission’s most careful decisions. Air heating began while the walls remained cold. The wall heaters stayed off until the frost coating the station had disappeared, because warming those surfaces too quickly could send liquid water into electrical panels and instruments.

A station that could not help them dock

Salyut 7 had been uncrewed since October 1984, but the decisive failure came the following February. A fault associated with the solar-array pointing and telemetry systems allowed its batteries to run down. Without electrical power, communications, thermal control and automatic rendezvous support were lost together.

Soyuz T-13 launched on 6 June. Two days later the crew found the station slowly rolling, with its solar arrays pointed in unhelpful directions. Dzhanibekov flew the closing approach while Savinykh monitored distance and relative motion. A handheld laser rangefinder helped them judge a target that could neither transmit guidance signals nor stabilise itself.

NASA’s Mir Hardware Heritage records the hard docking as the first by a Soyuz with an inactive station. Electrical connections through the docking collars confirmed that Salyut 7 was dead. Only then could the crew test its air and consider opening the hatch.

Cold, dark and still pressurised

The men sampled the station’s atmosphere before entering. It was very cold but breathable. They went in wearing winter clothing, including fur-lined hats, and used flashlights because the station lights had no power. Frost covered walls and apparatus, and the water supply had frozen.

A NASA technical survey of Soviet space-station systems later summarised what they found: no functioning electrical system, frozen water and instrument panels beneath a crust of ice. It reported that restoring electricity and life support took about a week and a half.

The scene was not simply an inconvenience. In orbit, meltwater does not drain safely towards a floor. It can gather into floating droplets or cling to surfaces, reaching connectors, circuit boards and equipment bays. Restoring heat therefore had to be treated as part of the electrical repair, not merely as a matter of comfort.

The failure had become a chain

All eight onboard batteries were flat and two were beyond recovery. A failed sensor in the solar-array pointing system had prevented the batteries from recharging, while a telemetry radio problem kept mission control from recognising what was happening in time. Power loss then shut down the radio along with the rest of the station.

Dzhanibekov and Savinykh could not simply connect the remaining batteries and switch on every load. They tested the surviving units and linked them to the solar arrays in a controlled sequence. Soyuz T-13 then turned the combined spacecraft until the panels faced the Sun, substituting the ferry’s control system for the station’s disabled one.

That manoeuvre produced the electrical foothold needed to restore circuits one at a time. Lights and communications mattered, but so did equipment that moved and refreshed the air. Until Salyut’s own life-support system became dependable, the crew continued relying on Soyuz T-13’s air regeneration.

The wall heaters deliberately waited

Air heaters were switched on on 10 June, according to NASA’s chronology. The wall heaters were a separate matter. NASA says they remained off until all the frost had evaporated, specifically to prevent water from entering equipment. The apparent contradiction disappears once warming the cabin air and heating the station’s walls are understood as different operations.

The aim was to raise the cabin temperature without causing an uncontrolled thaw across instrument surfaces. Frost could disappear into the cabin air and be handled through ventilation and moisture control; liquid water wandering through unpowered electronics would create a new fault before the existing one had been repaired.

The crew therefore worked in heavy clothing while the process continued. An account reconstructed from mission transcripts shows how methodical the early work was: air checks, battery tests, connections made in sequence and repeated consultation with the ground. The famous improvisation sat inside disciplined procedure.

The station’s water tanks did not thaw until the end of June. Freezing had destroyed the water heater, so a powerful television lamp was pressed into service to warm fluids. Normal cabin humidity was not restored until the end of July. Revival was a sequence lasting weeks, not a switch thrown on docking day.

Recovery came in layers

On 13 June, five days after docking, the attitude-control system returned to service. That was an important threshold because it meant an uncrewed Progress freighter could approach automatically. Progress 24 arrived later that month carrying a new water heater, three batteries, solar-array extensions and roughly 40 kilograms of other replacement parts.

A previous SpaceDaily account of the Salyut 7 rescue describes the wider emergency. The wall-heater detail sharpens the story: bringing a frozen station back to life required controlling the transition between ice, vapour and liquid around vulnerable electronics.

The rescue restored Salyut 7 as a working destination. Later crews visited, and in 1986 Leonid Kizim and Vladimir Solovyov travelled between Mir and Salyut 7 to retrieve instruments. That remains the only crewed journey made from one space station to another.

The difficult part was knowing what to delay

An ESA account of European human spaceflight later cited Dzhanibekov and Savinykh’s manual docking and revival of Salyut 7 as evidence for the value of human action in orbit. The conclusion is reasonable, but the rescue was not a triumph of improvisation alone. Training, system knowledge, ground planning and restraint were equally important.

Skylab offered an earlier example of astronauts rescuing a station after coupled thermal and power failures, covered in SpaceDaily’s account of the improvised parasol. Salyut 7 presented the inverse thermal problem: Skylab had to be cooled, while the Soviet station had to be warmed slowly enough to survive the warming.

Dzhanibekov and Savinykh restored Salyut 7 because they treated heat, moisture, electricity and life support as one connected system. The fur-lined hats and flashlights made the conditions visible. Holding back the wall heaters showed the harder discipline: knowing that the quickest route to warmth was not the safest route to recovery.