Operation Gunnerside - the Telemark raid

28th February 1943: Norwegian troops trained by the Special Operations Executive succeed with 'one of the most important sabotage raids ever'

Vemork hydroelectric power plant at Telemark in 1935. The process for producing heavy water took all seven stories of the front building, the final product was accumulated in tubs at the bottom.

When the British learnt that the Nazis had embarked on an atomic weapons programme they were prepared to take considerable risks to disrupt it. The main target w…