Let me start this off by saying this is my first editorial for this sight so I will keep it short and simple. I am writing this editorial to state my opinion on how batman survived the blast.
I like to think that batman when he was outta sigh of Gordon and the others he exited the bat and entered in the coordinates to fly over seas and out of range of Gotham and he drove off in his tumbler.
This is what I like to think happened but I would like to read some of your theories in the comments.