> Did the U.S. Air Force suffer a nuclear weapons accident at an airbase in Europe a few years back? [Update: After USAFE and LANL initially declined to comment on the picture, a Pentagon spokesperson later clarified that the image is not of an actual nuclear weapons accident but of a training exercise, as cautioned in the second paragraph below. The spokesperson declined to comment on the main conclusion of this article, however, that the image appears to be from inside an aircraft shelter at Volkel Air Base.]
So: no.
Gimlet-eyed viewers may have concluded the same thing independently, by noticing that there a couple people standing around in the background looking bored, one of them holding what may as well be a clipboard.