Perhaps Hitler was hoping to fit an Atomic bomb to the top of one of his planned intercontinental A12 rockets. If so, his intention was nothing more than a pipe dream. The Nazis were engaged in a secret nuclear energy project during World War II, trying to make a bomb as well as a nuclear reactor, but this effort was never going to produce results in the same way the Manhattan Project did. Hitler simply didn't put enough resources into it. On top of that, scientists who could have helped with the research were conscripted into the army, Luftwaffe, or navy, and their talents were wasted along with their blood. And, of course, the antisemitic political beliefs of the Nazis caused other talented people to flee Germany, not only draining the Third Reich of the brains needed to complete the project but also aiding the Americans who were sometimes the beneficiaries of these defections. All things considered, the one wonder weapon that could have persuaded the Allies to call a halt to their offensives was the very weapon that Hitler never put sufficient effort into. There's a certain irony to that.