The War Collection: Dambusters The True Story (1993) DVD
 
On the Night of May 16-17 1943, Lancasters of 617 Squadron, using bouncing bombs devised by Barnes Wallis, destroyed the Mohne and Eder dams in the Ruhr valley. It was one of the most brilliant feats of bombing ever achieved. The special bombs had to be dropped from an altitude of precisely sixty feet with no margin for error - all the while under fire.