Sightings2003

Yang Liwei describes unexplained knocking aboard Shenzhou 5

When

15 Oct 2003

Sources

2 public sources

China's first astronaut, Yang Liwei, said in a 2016 interview that during his 2003 Shenzhou 5 flight he heard a knocking like a hammer on an iron bucket that ground teams could not reproduce. Later crews reported similar sounds; proposed causes include thermal flexing.