Barnes Wallace was inspired by a catapult and some marbles. He discovered if you shoot the marbles onto water it will go further than if you shoot it in thin air. He took this on to create the bouncing bombs which were revolutionary for the war. Once the bombs were made, the 716 squadron took the bombs and blew up the three main dams in Germany that were called Mohne, Eder and Eneppe.
After the war, a film was made about the brave RAF pilots that carried out the raid. This year, it is the 75th year since the film was released and it was shown in the Royal Abert Hall. It was also shown in many cinemas and on television.