The Norwegian heavy water sabotage refers to a series of operations during World War II aimed at disrupting Nazi Germany's efforts to develop nuclear weapons. The primary target was the Vemork hydroelectric plant in Norway, which produced heavy water, a crucial component for nuclear reactors. Between 1940 and 1944, Allied forces, including Norwegian commandos and British intelligence, conducted several missions to destroy the heavy water production. The most notable operation occurred in 1943 when commandos successfully raided the plant, significantly hindering Germany's nuclear ambitions and contributing to the overall Allied war effort.