The first spacewalk
Alexei Arkhipovich Leonov stepped out of the Voskhod 3KD capsule, becoming the first man ever to walk in space. His spacewalk continued for 12 minutes and 9 seconds and it was part of the Voskhod 2 mission. The event was originally planned to take place a year earlier on Voskhod 1 mission but it was canceled. Leonov famously exited the spacecraft just days before the U.S. intended to launch their first two-man spaceship thus the Soviet Union managed to win this particular part of the well-known Space Race.