Extravehicular activity (EVA) tunnel on the Soviet Voskhod 2 spacecraft. The first ever EVA, or spacewalk, was performed by cosmonaut Alexei Leonov on 18th March 1965, while orbiting the Earth in the Voskhod 2 spacecraft. This is the tunnel that he used to exit and enter the spacecraft. It was designed to prevent decompression of the spacecraft when it was open.