Soyuz 4

First docking of two manned spacecraft (Soyuz-4 with cosmonauts B.V.Volynov, Å.V.Khrunov and A.S.Eliseev, and Soyuz-5 with cosmonaut
V.A.Shatalov), the first transition of cosmonauts from one spacecraft into another through the open space (E.V.Khrunov, A.S.Eliseev, from Soyuz -5 into Soyuz-4).