On the evening of May 16th 1943, nineteen Lancasters attacked the great dams of Western Germany with a revolutionary new ''bouncing'' bomb. The crew became known as The Dambusters.
Two men from the South watched the tests in 1942 and 1943. Bob Payne lived at Chesil Beach in Dorset, where the early prototypes were put through their paces.
Ant Larkins saw some of the later tests at Reculver on the Kent coast, where the old church towers acted as marker posts for the pilots.
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Philippa has the weekend weather for the east
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Landmarks across the south will switch off their lights for an hour tonight as part of action on climate change.