In 1965, when the United States and Russia were preparing to launch manned spacecraft into space, Commander Sergei Korolev decided to select pilots Alexei Leonov and Pavel Belyev to carry out the first flight mission, two years ahead of schedule. During this process, both the two astronauts, the commander and countless participants faced great pressure and risks. Under the attention of the public, the media simultaneously broadcast the launch process. When Alexei opened the hatch and took the first step in space, the whole Soviet Union was boiling. However, when Alexei was about to return, his space suit malfunctioned, and then the hatch of the spacecraft could not close automatically... He almost died in space...