On a moonlit winter night in 1943, nine Norwegian commandoes, trained and equipped in England, infiltrated the most heavily defended structure in occupied Europe. Their objective was to destroy the heavy water production facilities critical to the Nazi atomic bomb project. Four months earlier, three-dozen British soldiers had tried and died on a similar mission, without ever gaining sight of their target. But the Norwegians were destined to have a different fate...
After skillfully climbing the "unscaleable" (and therefore undefended) gorge below Norsk Hydro; they snuck into the facility, set and detonated their demolition charges, and escaped back down into the gorge without having to fire a single shot. This attack was the climax of the Allied efforts to deny Germany the bomb.