3rd Batman movie, the one that made even less sense than a superhero movie normally makes.
The entire plan depends on a fusion reactor acting like a fission bomb that Bane didn’t even know was down there, Blackgate being moved within city limits after the events of the second movie for no clear reason, and a letter that again no one knew existed while the plan was being carried out.
Also if he broke Batman’s back why not just kill him? Why give him a chance to escape?