See I don't buy that either. The only evidence I've seen twords that is Desmonds return, but he was pretty damn drunk in a boat fixed by a man with undefined repair skills. Do I think its some how shielded from the outside world? Yes, but we've seen transmisions from it are still able to escape, and its looking like its locatable or else we wouldn't have been shown Desmonds ex (thats just from a storytelling point of view. They'll only show us things that matter or red herrrings. I doubt thats a red herring).
And just on a physics level space and time are a unified entity. If something gets displaced from one its outof the other too. I just don't buy that the creators are doing a mystery where you'll have needed to understand A Brief History of Time to get the plot.