BBMF

The Derwent Reservoir in Derbyshire was used for practice runs by the elite crew of 617 Squadron as they prepared for the groundbreaking mission. The pilots practised the dangerous low-flying manoeuvres they needed to perfect in order to drop the new “bouncing bomb”, designed by engineer Barnes Wallis, at the exact height and level necessary for it to skim across the water and explode against German dams.

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