The Möhne, the Eder and the Sorpe.
Barnes and Molly Wallis in 1925. (Estate of Mary Stopes-Roe)
The Wallis home in Effingham, Surrey. (Cambridge University Library/MS Vickers)
Wallis in his study with an assistant. (Cambridge University Library/MS Vickers)
1940 cartoon showing the Wallis-designed Wellington bomber.
The scaled-down model of the Möhne at Nant-y-Gro in Powys, eight minutes after a test explosion in 1942. (The National Archives/AVIA 10/369)
Recording apparatus attached to scale-model dam at Watford. (The National Archives/DSIR 27/43)
Test explosion at Nant-y-Gro. (The National Archives/AVIA 10/369)
Cherwell, Portal, Pound and Churchill watching a display of anti-aircraft gunnery, June 1941. (Imperial War Museum/H 10306)
Air Vice Marshal the Hon. R.A. Cochrane. (Imperial War Museum/CH 14564); Sir Charles Craven. (Cambridge University Library/MS Vickers); Sir Norman Bottomley. (National Portrait Gallery, London/Howard Coster); Arthur Collins; Air Marshal Sir John Linnell. (Imperial War Museum/CM 5259); Gp. Capt. F. W. Winterbotham. (Barry James Gilmore/Fairfax Media/Getty Images)
Air Chief Marshal Sir Arthur Harris. (Imperial War Museum/CH 13020)
Harris with his wife Jill and daughter Jackie. (Leonard McCombe/Picture Post/Getty Images)
Avro Lancaster ED932 (G-George) being flown by Guy Gibson during tests at Reculver. (Imperial War Museum/FLM 2343)
An Upkeep bounces onto the seafront during tests at Reculver. (Imperial War Museum/FLM 2343)
Tests at Reculver. (Imperial War Museum/FLM 2360; FLM 2362; FLM 2363)
Melvin Young in the victorious 1938 Oxford Boat Race crew. (The Times/News Licensing)
Young’s miraculous October 1940 Atlantic rescue. (Trinity College Oxford, with help from Arthur G. Thorning)
Young with his rescuer’s captain. (Trinity College Oxford, with help from Arthur G. Thorning)
Melvin and Priscilla Young. (Trinity College Oxford, with help from Arthur G. Thorning)
John ‘Hoppy’ Hopgood. (Hopgood family)
Hopgood with his sister Marna and his mother. (Hopgood family)
Hopgood with Marna. (Hopgood family)
Aircrew of 106 Squadron. (Imperial War Museum/HU 91941)
Henry Maudslay at Eton. (Maudslay family)
Maudslay as squadron leader. (Lincolnshire County Council Archives)