Had seen the movie long ago, but found a really good docu about it after wandering around from your link.
Here, if anyone's interested : The Dambusters Raid - Full Documentary (48min)
I think it was Bobalu who provided the initial youtube link, but thanks for posting it here.
Also:
http://www.thedambusters.org.uk/
I read a book about 617 Squadron, written decades ago. One of the folks involved (Guy Gibson?) wrote a letter to a friend of his, in which he said, among other things, “I have enclosed for your inspection the Mohne dam”.
He then had someone else (different handwriting) write on the envelope “Opened and contents removed by Wartime Censor”.