Well. Let me just start with this. I am fairly disappointed with the outcome of my creative faux quest that I just "completed" in my game. I suited up Cait and myself in hazmat suits and made our way to the crater that I had created because of my chosen outcome in the game. To my astonishment, Bethesda has left us nothing to find at the bottom of the blast hole.. Now sure, a nuclear detonation blew the place up.... I at least expected to find some sort of remnant. Maybe an entrance to the Institute's ruins. I think it would be a cool spot to stick some DLC or a quest mod even. I'm sure there is still some kind of tech that survived the blast that the brotherhood could go after. And maybe we can see what the Institute looks like from the inside, all flooded and blown to bits. I left some screenshots in this post for your viewing pleasure, in no particular order, basically a before and after. Record of the exploration. Screenshots are no bueno under water.

http://imgur.com/mqth4HG

http://imgur.com/WP7u81P

http://imgur.com/pJvo4p6

http://imgur.com/JZWC2cd

http://imgur.com/WAzXNUO

http://imgur.com/l2BcxQC

http://imgur.com/ndFZow2

No, I don't think one should be able to find anything. It was a nuclear explosion that should have roasted almost everything while the rest got destroyed by falling rabble. A much smaller explosion would not have left anything to explore yet alone this one.