Salyut 3

• 1. Introduction

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  Salyut 3 carried a secret into orbit. Launched on the 25th of June 1974, it was presented to the world as a civilian Soviet space station, part of the Salyut programme that had already sent crews into orbit. But Western observers were suspicious almost immediately. The station flew unusually low, its crew came from the Soviet Air Force, and it used radio frequencies normally reserved for military operations. The real purpose of Salyut 3 was reconnaissance, surveillance, and something even more unexpected: self-defence. A gun was bolted to its hull. Inside, cosmonauts would photograph targets laid out on the ground far below. And when the last crew left, the station would fire its weapon alone in the void before burning up over the Pacific. How did a military outpost end up disguised as a peaceful research station? And what actually happened during its brief, secretive life in orbit?

• 2. The Almaz Secret

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  Vladimir Chelomey was the engineer credited with designing the military Almaz stations, which ran parallel to the Soviet civilian space effort throughout the late 1960s and into the 1970s. The civilian stations, known as Long-term Orbital Stations or DOS, had their own lineage stretching back to Salyut 1, launched in April 1971. The military counterparts were called Orbital Piloted Stations, or OPS. To prevent the West from understanding what they were, Soviet authorities publicly labelled every station in this family under the Salyut name. Salyut 3 carried the internal designation OPS-2, or Almaz 2. The first Almaz station, Salyut 2, launched in April 1973, never received a crew. It failed within days of reaching orbit, leaving Salyut 3 as the first military station of this kind to actually function as intended. The Soviet Union's reluctance to release information about the station's design extended even to the mission details, which is why so much of what is known about Salyut 3 comes from post-Soviet sources and the recollections of the cosmonauts who flew there.

• 3. A Station Equipped for War

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  The Agat-1 Earth-observation telescope dominated the work compartment of Salyut 3. Its focal length was 6.375 metres, and post-Soviet sources described its optical resolution as better than three metres. NASA historian Siddiqi went further, speculating that, given the size of the telescope's mirror, the resolution was likely better than one metre. That placed it among the most powerful optical instruments then in orbit. Cosmonaut Pavel Popovich, who commanded the Soyuz 14 mission to the station, later recalled that the station carried fourteen cameras in total. These included a topographical camera, a star camera, and a Volga infrared camera with a resolution of 100 metres. Film developed aboard the station could be processed and scanned within as little as 30 minutes of being shot. Important images were broadcast to Earth via a television imaging system; less critical material was packed into a small Earth-return capsule that could be ejected from the station entirely. On the 9th of July 1974, the crew activated these systems and spent several days photographing locations including central Asia, as well as targets laid out deliberately on the ground at Baikonur.

• 4. The Gun in Orbit

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  A weapon aboard a crewed space station was not something either superpower publicly acknowledged. The gun fitted to Salyut 3 was designed for self-defence, its origins attributed to Alexander Nudelman. Accounts differ on which specific weapon it was: some say a Nudelman-Rikhter Vulkan gun, a variant of the 23 mm Nudelman aircraft cannon; others point to a Nudelman NR-30, a 30 mm gun. Later Russian sources suggest the weapon was the Rikhter R-23, barely known outside the Soviet Union. Pavel Popovich has reportedly verified that the station was armed. The gun was fixed rigidly to the hull, meaning the only way to aim it was to rotate the entire station. Any live test with cosmonauts aboard was ruled out because of the risk that the recoil would shake the structure too violently. After the last crewed mission departed, the ground commanded the gun to fire. Some sources say it fired until it ran dry; others describe three test firings. Either way, a weapon discharged in the vacuum of space during an officially civilian mission, and very little of it entered the public record for decades.

• 5. Living Inside a Spy Station

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  The total habitable volume of Salyut 3 was 90 cubic metres, spread across an airlock chamber, a large-diameter work compartment, and a smaller living compartment. Its launch mass was 18,900 kilograms. Two main engines, each producing 400 kilograms-force of thrust, kept the station manoeuvrable. Maintaining constant orientation relative to Earth's surface required as many as 500,000 firings of the attitude control thrusters, a figure that suggests the relentless mechanical demands of keeping a reconnaissance platform precisely aimed. Life inside was more considered than the station's military purpose might suggest. There was a shower, a foldaway bed, and a standing sleeping station. The floor was covered in Velcro so cosmonauts could move without drifting. Entertainment ran to a magnetic chess set, a small library, and a cassette deck stocked with audio tapes. For exercise, the crew had a treadmill and a Pingvin suit, a garment designed to keep the body working against resistance. The station also tested the first water-recycling facilities carried into orbit by a Soviet spacecraft, a system called Priboy.

• 6. The Missions That Flew and Failed

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  Pavel Popovich commanded Soyuz 14 alongside flight engineer Yury Artyukhin. They launched on the 3rd of July 1974, docked the following day, and spent fifteen days aboard the station before landing safely on the 19th of July. Then Soyuz 15 launched on the 26th of August 1974, carrying commander Gennadi Sarafanov and flight engineer Lev Demin. Demin was 48 years old at the time, making him the oldest person to have flown in space up to that point. That record would stand only until the following year, when Deke Slayton flew as part of the Apollo-Soyuz Test Project. Sarafanov and Demin never made it aboard Salyut 3. The Igla rendezvous system on their Soyuz malfunctioned, and neither cosmonaut could complete a manual docking. Coming within 40 metres of the station before turning back, they de-orbited and landed just two days after launch. The failure meant the Igla system needed significant rework, and the time required to carry out those modifications exceeded the remaining orbital life of Salyut 3. The third planned crew mission was cancelled outright, and the spacecraft that would have carried them was later reassigned to a mission at the civilian station Salyut 4.

• 7. Disposal and Aftermath

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  On the 23rd of September 1974, after the decision to send no further crews, the station ejected its Earth-return capsule. Small engines deorbited the capsule, and NASA reported that its parachute opened at an altitude of 8.4 kilometres. Other sources dispute this, saying the main parachute failed and the capsule was deformed on landing, though all the film inside was recovered. The station itself remained in orbit for months longer. Its final orbital altitude, as reported by NASA, was between 268 and 272 kilometres. Salyut 3 was deorbited on the 24th of January 1975, re-entering the atmosphere over the Pacific Ocean. The next station the Soviet Union launched was the civilian Salyut 4; the next military one was Salyut 5, which became the last station of the Almaz line. Salyut 3's operational record was thin by the standards of what had been planned: one crew, one partially documented set of photographs, and an armed station that fired its gun in private before it fell.