According to a story in The Daily Mirror, a Chinese astronaut said he heard distinct knocking on the body of the spaceship and it left him feeling very nervous.
The story reports that astronaut Yang Liwei said the knocking sounded like a hammer hitting an iron bucket. Perhaps someone was banging that radiator to get more heat in that bad-boy ship … it gets cold in space, y’all.
Yang Liwei, 51, now the equivalent of a major general in China’s Air Force, said he looked out the window and saw nothing. And he never heard the sound again.
Probably just a salesman.