28 November 2016
Chinese astronaut Yang Liwei said that he had heard a mysterious knock during his flight in space, China Central Television reported. Yang said he was very nervous when he heard the sound, and moved close to the porthole to try to find out the cause. However, nothing out of the ordinary appeared both inside and outside. After returning to Earth, he told technicians about the mysterious sound, and tried to imitate it with some instruments, so as to solve the mystery. But Yang said he had never heard the exact sound again. The sound has also been heard by Shenzhou 6 and Shenzhou 7 astronauts. Yang said, "Before entering space, I have told them that the sound is a normal phenomenon, so there is no need to worry."
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