It wouldn't surprise me in the least. I know that you can't go there, so it's the perfect place to hide something like that. This is fiction, @v4vapid did a writing contest and asked me to enter... I just made this up on the spur of the moment (drawing from my Night Gods series)

Speaking of magnetic fields... in 2009 I was diagnosed with a glioblastoma (the deadliest brain tumors). My friend from college lives in Wisconsin and told me where he lives is the only place on earth where the magnetic field is reversed. I went there in Dec and by July my tumor was gone!