Soyuz 3 marked the Return To Flight of human Soyuz missions after the fatal Soyuz 1 flight. Launched one day after the uncrewed Soyuz 2, Soyuz 3's single crewmember attempted the first Russian rendezvous and docking. While the rendezvous was successful, the docking was not. Two attempts failed, the first because Beregovoy didn't realize Soyuz 2 was "upside down" to the way it should have been for docking. The Soviets lied, claiming the docking was successful. The mission lasted nearly 4 days and validated all the changes and upgrades made to Soyuz, the first version of the craft still flying to the International Space Station today.