Not sure about the atom bomb thing, but Ren's comment got me thinking... (never a good thing...)
There's much speculation about why the Mayans built pyramids much like the Egyptians. Obviously there are some noticeable differences in the structures, but considering how far apart the two cultures were, it's odd that they both thought to build pyramids for such purposes. Some people believe Atlantians made this possible. According to the correct translation of Plato's dialogue, Atlantis is located "Beyond the pillars of Hercules," (the Strait of Gibraltar). This would put it out in the Atlantic (since it was written by someone in Greece-- or Egypt, if we understand that Plato was quoting Solon.) Either way, it would NOT be in the Mediterranean as people often think. So some people think Atlantis acted as a kind of liaison between the east and west, allowing ideas to transfer from culture to culture.
What does all of this have to do with anything? Beats me. I guess they could tie it in to Indy4 somehow if they want. Anyway, it's now past midnight and I have to go to work tomorrow, so with that half-developed thought, I'm going to bed.