Who or What Is Knocking On His Spacecraft? | NASA s Unexplained Files

China s first astronaut gets a haunting experience as he hears an eerie knocking on the outside of his spaceship s door. There are no faults with his craft, so is he imagining it, or is there someone, or something, on the outside knocking to get in? Stream Full Episodes of NASA s Unexplained Files: https://www.discoveryplus.com/show/nasas-unexplained-files Subscribe to Science Channel: http://bit.ly/SubscribeScience Like us on Facebook: https://www.facebook.com/ScienceChannel Follow us on Twitter: https://twitter.com/ScienceChannel Follow us on Instagram: https://www.instagram.com/ScienceChannel/