Nuclear World War II: Mutally Assured Destruction

I could see a few of the first attacks getting through but after that not a chance.

Not even that. Trying to launch aircraft loaded down with primitive nuclear weapons without fighter escort over 6,000 km is going to be a bloody disaster.
 
... early nuclear bombs are too heavy to put on a sub, and any subs trying to cross the Atlantic after 1943 will be detected and destroyed.

No, they're not too heavy. An early nuclear weapon weighs about 5 tonnes - that's well within the capacity of any ocean-going U-boat in this timeframe. Consider that each torpedo weighed about 1.5 tonnes, and they would normally carry at least a dozen.

As for the detection issue, I'm not convinced it's as clear-cut as you make out. Even at the end of the war, putting to sea in a U-boat wasn't a death sentence for the crew. A U-boat which avoided the major shipping routes as much as possible might have a decent chance of making it to the eastern seaboard of the USA.
 

Kongzilla

Banned
And I belive it was the Enigma code that was the death sentence for German U-Boats. Even as dodgy as the Nazis were they would probably order Radio silence and what not. Plus the crew would be used by Loyal SS men and other crazy personnel
 
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