Nuclear weapons are real. We know that because of the massive amount of nuclear radiation that occurs when a nuclear bomb drops that leaves the area lifeless for thousands of years just like Chernobyl is. Visit Hiroshima and Nagasaki, they are completely void of life.

If it was something like a massive bomb made of hundreds of thousands of sticks of dynamite it would just make a massive explosion and kill thousands of people and they could rebuild the cities on the same spot and today there would be beautiful cities full of healthy people, with no evidence of any highly radioactive nuclear explosions in the past.