not so much a miscalculation but a bad measurement due to faulty equipment.
The scientists never made the claim that they had observed superluminal velocity, rather they published their data in hopes that someone could help them find what was wrong.
The NAZIs were indeed working on the bomb, however they did not have the capacity to refine uranium. You can make plutonium from unrefined uranium in a heavy water reactor, but some norwegian commandos took out the NAZI heavy water plant.
After the war a partially finished heavy water reactor was discovered, buried deeply underground.
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