the dambusters

FThe film falls into two distinct halves. First, Wallis struggles to develop a means of attacking Germany's dams, in the hope of crippling German heavy industry. Working for the Ministry of Aircraft Production, as well as doing his own job at Vickers, he works feverishly to make practical his theory of a bouncing bomb which would skip over the water to avoid protective torpedo nets. When it came into contact with the dam, it would sink before exploding, making it much more destructive. Wallis calculates that the aircraft will have to fly extremely low (60 ft) in order for the bombs to skip over the water correctly. But when he takes his conclusions to the Ministry, he is told that lack of production capacity means they cannot go ahead with his proposals.

Angry and frustrated, Wallis secures an interview with Sir Arthur "Bomber" Harris (played by Basil Sydney), the head of Bomber Command, who at first is reluctant to take the idea seriously. But he is eventually convinced and takes the idea to the Prime Minister, who authorises the project.

Bomber Command forms a special squadron of Lancaster bombers, 617 Squadron, to be commanded by Wing Commander Guy Gibson. He recruits experienced crews, especially those with low-altitude flight experience. While they train for the mission, Wallis continues his development of the bomb, but experiences problems. With only a few weeks to go, he succeeds in fixing them and the mission can go ahead.

The film's reflective last minutes convey the poignant mix of emotions felt by the characters – triumph over striking a successful blow against the enemy's industrial base is greatly tempered by the sobering knowledge that many died in the process of delivering it.