On January 16, 1969, Soyuz 4 and Soyuz 5 docked in orbit, marking the first time two crewed spacecraft joined together in space, and the first transfer of crew between vehicles in orbit. Cosmonauts Alexei Yeliseyev and Yevgeny Khrunov spacewalked from Soyuz 5 into Soyuz 4, demonstrating techniques essential for future space stations.
The Soviet space program, still smarting from losing the race to circle and land on the Moon to the Americans, scored a genuine technical triumph with the Soyuz 4/5 docking. Vladimir Shatalov piloted Soyuz 4 solo, launching a day after Soyuz 5 carried three cosmonauts, Boris Volynov, Alexei Yeliseyev, and Yevgeny Khrunov, into orbit.
The two craft found each other and linked using an automated rendezvous system followed by manual docking, forming what Soviet media proudly, if briefly, called the world's first experimental space station. Because the Soyuz spacecraft lacked an internal transfer tunnel, Yeliseyev and Khrunov had to don spacesuits and spacewalk from one capsule to the other through open space, a tense, historic first.
The mission demonstrated orbital docking and crew transfer capabilities that would become routine decades later with Mir and the International Space Station, but at the time felt like a genuine leap. Soviet propaganda touted the mission as proof of continued space superiority even as NASA prepared for the first crewed lunar landing later that year, a reminder that the Space Race's competitive pulse hadn't slowed despite America's looming triumph.
Key people: Vladimir Shatalov, Boris Volynov