Obscure Facts
The Nazis Almost Built an Atomic Bomb -- But Lacked One Critical Material
Germany's nuclear weapons program, led by Werner Heisenberg, came tantalizingly close to building an atomic bomb but ultimately failed for a reason that had nothing to do with scientific knowledge and everything to do with logistics: they did not have enough heavy water. The Norwegian resistance, led by Norwegian commandos, conducted a series of audacious raids on the Vemork heavy water plant in Norway, destroying equipment and sinking ships carrying the product to Germany. The last shipment was sunk in February 1944. Without sufficient heavy water to sustain a chain reaction, the German bomb program never progressed beyond theoretical work.
Source: Based on Heisenberg's War by Thomas Powers and The Norwegian Saboteurs by Leif Larsen memoirs