At the 33 second mark of this video of the Chinese space walk the astronaut moves a flag quickly from right to left. http://uk.youtube.com/watch?v=fWw0ilbuZuk The flag flutters as it moves. The purpose of the YouTube video was to prove the Chinese space walks were faked in a water tank. I want to know whether the flag is behaving the way it would in water, or in a vacuum. My tendency is to think the flag is behaving the way it would in water. Can anybody clear this up?