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In May 1953, British airman Ronald Maddison died after taking part in a nerve gas test at government research base Porton Down. His death would be covered up for nearly fifty years. Witness speaks to fellow test subject Michael Cox, who was in the gas chamber when Maddison collapsed.

(Photo: Sergeant Gordon Beard of the RAF Regiment wearing protective clothing and using a residual vapour detector at Porton Down in Wiltshire, 3 June 1969. Credit: J. Wilds/Keystone/Getty Images)