Planned duration 19 days. Biological endurance mission cancelled after near-disaster with Voskhod 2. Initial Orbit was to have been 175 km X 500 km at 65 deg. Follow-on missions with journalist, physician, and all-female crews also cancelled. Original Prime Crew was Katys, Volynov; Backup Crew: Beregovoi, Demin; Support Crew: Artyukhin, Shatalov. These assignments were reshuffled to those shown when Katys had to be dropped from the prime crew.
Carried Vladimir Shatalov; docked with Soyuz 5; returned with Yevgeni Khrunov, Alexsei Yeliseyev from Soyuz 5. Scientific, technical and medico-biological research, checking and testing of onboard systems and design elements of space craft, docking of piloted space craft and construction of an experimental space station, transfer of cosmonauts from one craft to another in orbit. Recovered January 17, 1969 06:51 GMT. This mission finally successfully completed the simulated lunar orbit docking and crew transfer mission attempted by Soyuz 1 in April 1967. In making the transfer Khrunov and Yeliseyev avoided the most spectacular survivable incident of the space age - the nose-first reentry of Soyuz 5, still attached to its service module.
Tested spacecraft systems and designs, manoeuvring of space craft with respect to each other in orbit, conducted scientific, technical and medico-biological experiments in group flight. Carried Vulkan welding furnace for vacuum welding experiments in depressurized orbital module. Was to have taken spectacular motion pictures of Soyuz 7 - Soyuz 8 docking but failure of rendezvous electronics in all three craft due to new helium pressurization integrity test prior to mission did not permit successful rendezvous and dockings. Recovered October 16, 1969 9:52 GMT.
The passive spacecraft in the second planned test of the Kontakt lunar rendezvous/docking system. One or two of the crew would have spacewalked to the Soyuz 11 Kontakt and returned in the other spacecraft.