Of the four dams targeted, the Eder had the most difficult approach. Dambuster pilot David Shannon described the problems of his attack: "There was this huge gothic castle stuck up like an eagle's nest right up on a point and you had to fly over that and drop right down the hill. It was wooded and rough land and scenically it was rather beautiful, the situation of this lake, but not the sort of place to try and get in with a four-engine aircraft, down to 60ft, do your run, get your speed to 232mph and then have a sheer rock face at the end of it to climb up over the top." The experimental bomb, the new squadron and the bold plan had worked. A torrent had been unleashed. But at a cost, of the 133 aircrew taking part, 53 died and three were captured. Extensive damage was caused on the ground - though the impact on the wider German war effort is still hotly debated.