Great film, but one thing I didn't understand... [Spoilers]
...what's with the 'atomics' being on Arrakis? House Atriades wasn't there for long, and before that the Harkonnen were there for hundreds of years. So at what point exactly did the stash of atomic missiles, his "grandfather's legacy" I think Gurney called it, get to a secret bunker there? Were they there the whole time the Harkonnen ruled the planet? That seems really unlikely. It also doesn't seem likely they managed to transport them there in the very short time they ruled. Why would they move them there anyway, and not keep them on their home planet?
Maybe someone familiar with the books can explain this?