Johnny Johnson was attached to the crews that were going to make for the Zorper Dam. He simply couldn't for a long time find the right place to drop the bomb. It took nine goes at it until the rear gunner said, will somebody just get that bomb out of here? And on the next run as it happened, he delivered it and found it purely by instinct. There was a film made of the raid called the Dambusters with a very catchy tune. Tonight there are 617 squad. Tomorrow the world will know the mayors.