Salyut 3 featured a “self-defense” gun purportedly designed by Alexander Nudelman for station use. Some reports suggest it was outfitted with a Nudelman-Rikhter “Vulkan” gun, a modified version of the 23mm Nudelman aircraft cannon, or conceivably a N...

Initially, the rendezvous with Salyut 3 proceeded smoothly. However, as the Soyuz spacecraft approached the station, a critical problem arose. The Igla rendezvous system, designed to guide the spacecraft to the station, malfunctioned.