In this unique footage from the IWM collection, filmed shortly before the Dambusters' Raid in May 1943, an Avro Lancaster flies low off the Kent coast trialling a cylinder-type "Upkeep" bouncing bomb. Learn more about the incredible story behind the raid: http://bit.ly/2rPxxAK © IWM MTE 3437 | Imperial War Museum London

Operation Chastise (Dambusters Raid) 16–17 May 1943 🇬🇧🇬🇧🇬🇧 Operation Chastise was an attack on German dams carried out on 16–17 May 1943 by Royal Air Force No. 617 Squadron, subsequently publicised as the "Dam Busters", using a specially developed "bouncing bomb" invented and developed by Barnes Wallis. The Möhne and Edersee Dams were breached, causing catastrophic flooding of the Ruhr valley and of villages in the Eder valley; the Sorpe Dam sustained only minor damage. Two hydroelectric p